Quarterly report pursuant to Section 13 or 15(d)

Details Of Company's Impaired Loans (Detail)

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Details Of Company's Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Impaired [Line Items]      
Recorded Investment, with no allowance recorded $ 20,189 $ 20,189 $ 19,643
Unpaid Principal Balance, with no allowance recorded 22,544 22,544 20,633
Related Allowance, with no allowance recorded         
Average Recorded Investment , with no allowance recorded 19,675 19,803 18,590
Interest Income Recognized in Period, with no allowance recorded 191 288 665
Recorded Investment, with allowance recorded 18,365 18,365 17,610
Unpaid Principal Balance, with allowance recorded 19,727 19,727 17,860
Related Allowance, with allowance recorded 3,129 3,129 4,181
Average Recorded Investment , with allowance recorded 18,927 19,004 16,893
Interest Income Recognized in Period, with allowance recorded 167 333 905
Recorded Investment 38,554 38,554 37,253
Unpaid Principal Balance 42,271 42,271 38,493
Related Allowance 3,129 3,129 4,181
Average Recorded Investment 38,602 38,807 35,483
Interest Income Recognized in Period 358 621 1,570
Commercial, financial and agricultural
     
Financing Receivable, Impaired [Line Items]      
Recorded Investment, with no allowance recorded 2,555 2,555 1,264
Unpaid Principal Balance, with no allowance recorded 2,873 2,873 1,264
Related Allowance, with no allowance recorded         
Average Recorded Investment , with no allowance recorded 1,902 1,818 1,501
Interest Income Recognized in Period, with no allowance recorded 25 39 74
Recorded Investment, with allowance recorded 1,405 1,405 4,314
Unpaid Principal Balance, with allowance recorded 1,405 1,405 4,314
Related Allowance, with allowance recorded 372 372 1,382
Average Recorded Investment , with allowance recorded 1,418 1,433 4,156
Interest Income Recognized in Period, with allowance recorded 25 47 226
Recorded Investment 3,960 3,960 5,578
Unpaid Principal Balance 4,278 4,278 5,578
Related Allowance 372 372 1,382
Average Recorded Investment 3,320 3,251 5,657
Interest Income Recognized in Period 50 86 300
Real estate - construction
     
Financing Receivable, Impaired [Line Items]      
Recorded Investment, with no allowance recorded 8,772 8,772 11,583
Unpaid Principal Balance, with no allowance recorded 10,234 10,234 12,573
Related Allowance, with no allowance recorded         
Average Recorded Investment , with no allowance recorded 8,832 8,916 10,406
Interest Income Recognized in Period, with no allowance recorded 97 130 226
Recorded Investment, with allowance recorded 10,757 10,757 4,679
Unpaid Principal Balance, with allowance recorded 11,898 11,898 4,679
Related Allowance, with allowance recorded 1,748 1,748 1,482
Average Recorded Investment , with allowance recorded 11,109 11,163 3,987
Interest Income Recognized in Period, with allowance recorded 78 159 94
Recorded Investment 19,529 19,529 16,262
Unpaid Principal Balance 22,132 22,132 17,252
Related Allowance 1,748 1,748 1,482
Average Recorded Investment 19,941 20,079 14,393
Interest Income Recognized in Period 175 289 320
Owner-occupied commercial
     
Financing Receivable, Impaired [Line Items]      
Recorded Investment, with no allowance recorded 5,735 5,735 2,493
Unpaid Principal Balance, with no allowance recorded 5,735 5,735 2,493
Related Allowance, with no allowance recorded         
Average Recorded Investment , with no allowance recorded 5,752 5,769 2,523
Interest Income Recognized in Period, with no allowance recorded 42 60 153
Recorded Investment, with allowance recorded 74 74 3,515
Unpaid Principal Balance, with allowance recorded 74 74 3,515
Related Allowance, with allowance recorded 43 43 88
Average Recorded Investment , with allowance recorded 80 82 3,504
Interest Income Recognized in Period, with allowance recorded 1 2 365
Recorded Investment 5,809 5,809 6,008
Unpaid Principal Balance 5,809 5,809 6,008
Related Allowance 43 43 88
Average Recorded Investment 5,832 5,851 6,027
Interest Income Recognized in Period 43 62 518
1-4 family mortgage
     
Financing Receivable, Impaired [Line Items]      
Recorded Investment, with no allowance recorded 1,635 1,635 1,293
Unpaid Principal Balance, with no allowance recorded 1,636 1,636 1,293
Related Allowance, with no allowance recorded         
Average Recorded Investment , with no allowance recorded 1,632 1,631 1,241
Interest Income Recognized in Period, with no allowance recorded 17 34 44
Recorded Investment, with allowance recorded 4,197 4,197 4,397
Unpaid Principal Balance, with allowance recorded 4,418 4,418 4,397
Related Allowance, with allowance recorded 811 811 904
Average Recorded Investment , with allowance recorded 4,413 4,414 4,484
Interest Income Recognized in Period, with allowance recorded 37 72 198
Recorded Investment 5,832 5,832 5,690
Unpaid Principal Balance 6,054 6,054 5,690
Related Allowance 811 811 904
Average Recorded Investment 6,045 6,045 5,725
Interest Income Recognized in Period 54 106 242
Other mortgage
     
Financing Receivable, Impaired [Line Items]      
Recorded Investment, with no allowance recorded 1,456 1,456 2,837
Unpaid Principal Balance, with no allowance recorded 1,456 1,456 2,837
Related Allowance, with no allowance recorded         
Average Recorded Investment , with no allowance recorded 1,419 1,413 2,746
Interest Income Recognized in Period, with no allowance recorded 10 25 162
Recorded Investment, with allowance recorded 1,730 1,730 331
Unpaid Principal Balance, with allowance recorded 1,730 1,730 331
Related Allowance, with allowance recorded 92 92  
Average Recorded Investment , with allowance recorded 1,734 1,739 337
Interest Income Recognized in Period, with allowance recorded 25 50 22
Recorded Investment 3,186 3,186 3,168
Unpaid Principal Balance 3,186 3,186 3,168
Related Allowance 92 92  
Average Recorded Investment 3,153 3,152 3,083
Interest Income Recognized in Period 35 75 184
Real estate - mortgage
     
Financing Receivable, Impaired [Line Items]      
Recorded Investment, with no allowance recorded 8,826 8,826 6,623
Unpaid Principal Balance, with no allowance recorded 8,827 8,827 6,623
Related Allowance, with no allowance recorded         
Average Recorded Investment , with no allowance recorded 8,803 8,813 6,510
Interest Income Recognized in Period, with no allowance recorded 69 119 359
Recorded Investment, with allowance recorded 6,001 6,001 8,243
Unpaid Principal Balance, with allowance recorded 6,222 6,222 8,243
Related Allowance, with allowance recorded 946 946 992
Average Recorded Investment , with allowance recorded 6,227 6,235 8,325
Interest Income Recognized in Period, with allowance recorded 63 124 585
Recorded Investment 14,827 14,827 14,866
Unpaid Principal Balance 15,049 15,049 14,866
Related Allowance 946 946 992
Average Recorded Investment 15,030 15,048 14,835
Interest Income Recognized in Period 132 243 944
Consumer
     
Financing Receivable, Impaired [Line Items]      
Recorded Investment, with no allowance recorded 36 36 173
Unpaid Principal Balance, with no allowance recorded 610 610 173
Related Allowance, with no allowance recorded         
Average Recorded Investment , with no allowance recorded 138 256 173
Interest Income Recognized in Period, with no allowance recorded     6
Recorded Investment, with allowance recorded 202 202 374
Unpaid Principal Balance, with allowance recorded 202 202 624
Related Allowance, with allowance recorded 63 63 325
Average Recorded Investment , with allowance recorded 173 173 425
Interest Income Recognized in Period, with allowance recorded 1 3  
Recorded Investment 238 238 547
Unpaid Principal Balance 812 812 797
Related Allowance 63 63 325
Average Recorded Investment 311 429 598
Interest Income Recognized in Period $ 1 $ 3 $ 6