Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail)

v2.4.0.6
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Advertising Expense $ 454,000 $ 406,000 $ 313,000
Interest Rate Swap [Member] | Regional Correspondent Bank [Member]
     
Derivative, Notional Amount 11,100,000    
Interest Rate Swap [Member] | Customers [Member]
     
Derivative, Notional Amount 11,100,000    
Minimum [Member]
     
Property, Plant and Equipment, Useful Life     3 years
Maximum [Member]
     
Property, Plant and Equipment, Useful Life     10 years
Federal Reserve Bank [Member]
     
Cash Reserve Deposit Required and Made $ 16,000,000 $ 7,500,000