Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Loans - Analysis of Allowance for Loans Losses by Portfolio Segment (Details)

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Note 5 - Loans - Analysis of Allowance for Loans Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Balance, beginning of period $ 64,239 $ 55,059 $ 59,406 [1] $ 51,893  
Charge-offs (4,047) (1,555) (7,823) (7,997)  
Recoveries 63 152 412 393  
Provision 6,624 4,803 14,884 14,170  
Balance, end of period 66,879 58,459 66,879 58,459  
Individually Evaluated for Impairment 6,801   6,801   $ 5,609
Collectively Evaluated for Impairment 60,078   60,078   53,797
Ending Balance 6,363,531   6,363,531   5,851,261 [1]
Individually Evaluated for Impairment 37,733   37,733   40,510
Collectively Evaluated for Impairment 6,325,798   6,325,798   5,810,751
Commercial Real Estate Portfolio Segment [Member]          
Balance, beginning of period 36,178 29,127 32,880 28,872  
Charge-offs (3,923) (924) (6,743) (6,846)  
Recoveries 52 67 229 273  
Provision 6,794 3,431 12,735 9,402  
Balance, end of period 39,101 31,701 39,101 31,701  
Individually Evaluated for Impairment 6,297   6,297   4,276
Collectively Evaluated for Impairment 32,804   32,804   28,604
Ending Balance 2,478,788   2,478,788   2,279,366
Individually Evaluated for Impairment 23,138   23,138   26,447
Collectively Evaluated for Impairment 2,455,650   2,455,650   2,252,919
Real Estate Portfolio Segment[Member]          
Ending Balance 3,277,525   3,277,525   2,928,808
Real Estate Portfolio Segment[Member] | Construction Loans [Member]          
Balance, beginning of period 4,062 5,138 4,989 5,125  
Charge-offs (16) (56)  
Recoveries 4 12 108 42  
Provision (132) 197 (1,163) 220  
Balance, end of period 3,934 5,331 3,934 5,331  
Individually Evaluated for Impairment 181   181   120
Collectively Evaluated for Impairment 3,753   3,753   4,869
Ending Balance 543,611   543,611   580,874
Individually Evaluated for Impairment 1,463   1,463   1,571
Collectively Evaluated for Impairment 542,148   542,148   579,303
Real Estate Portfolio Segment[Member] | Real Estate Loan [Member]          
Balance, beginning of period 23,438 20,392 21,022 17,504  
Charge-offs (48) (550) (869) (922)  
Recoveries 1 59 44 62  
Provision (62) 1,065 3,132 4,322  
Balance, end of period 23,329 20,966 23,329 20,966  
Individually Evaluated for Impairment 274   274   1,163
Collectively Evaluated for Impairment 23,055   23,055   19,859
Ending Balance 3,277,525   3,277,525   2,928,808
Individually Evaluated for Impairment 13,083   13,083   12,404
Collectively Evaluated for Impairment 3,264,442   3,264,442   2,916,404
Consumer Portfolio Segment [Member]          
Balance, beginning of period 561 402 515 392  
Charge-offs (76) (65) (211) (173)  
Recoveries 6 14 31 16  
Provision 24 110 180 226  
Balance, end of period 515 $ 461 515 $ 461  
Individually Evaluated for Impairment 49   49   50
Collectively Evaluated for Impairment 466   466   465
Ending Balance 63,607   63,607   62,213
Individually Evaluated for Impairment 49   49   88
Collectively Evaluated for Impairment $ 63,558   $ 63,558   $ 62,125
[1] Derived from audited financial statements.