Annual report pursuant to Section 13 and 15(d)

Note 3 - Loans - Analysis of Allowance for Loans Losses by Portfolio Segment (Details)

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Note 3 - Loans - Analysis of Allowance for Loans Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Balance, beginning of year $ 59,406 $ 51,893 $ 43,419
Charge-offs (12,753) (16,332) (5,198)
Recoveries 545 620 274
Provision 21,402 23,225 13,398
Balance, end of year 68,600 59,406 51,893
Individually Evaluated for Impairment 8,128 5,609  
Collectively Evaluated for Impairment 60,472 53,797  
Ending Balance 6,533,499 5,851,261  
Individually Evaluated for Impairment 38,591 40,510  
Collectively Evaluated for Impairment 6,494,908 5,810,751  
Commercial Real Estate Portfolio Segment [Member]      
Balance, beginning of year 32,880 28,872  
Charge-offs (11,428) (13,910)  
Recoveries 349 337  
Provision 17,215 17,581  
Balance, end of year 39,016 32,880 28,872
Individually Evaluated for Impairment 6,066 4,276  
Collectively Evaluated for Impairment 32,950 28,604  
Ending Balance 2,513,225 2,279,366  
Individually Evaluated for Impairment 18,444 26,447  
Collectively Evaluated for Impairment 2,494,781 2,252,919  
Real Estate Portfolio Segment[Member]      
Ending Balance 3,422,589 2,928,808  
Real Estate Portfolio Segment[Member] | Construction Loans [Member]      
Balance, beginning of year 4,989 5,125  
Charge-offs (56)  
Recoveries 112 168  
Provision (1,579) (248)  
Balance, end of year 3,522 4,989 5,125
Individually Evaluated for Impairment 126 120  
Collectively Evaluated for Impairment 3,396 4,869  
Ending Balance 533,192 580,874  
Individually Evaluated for Impairment 1,461 1,571  
Collectively Evaluated for Impairment 531,731 579,303  
Real Estate Portfolio Segment[Member] | Real Estate Loan [Member]      
Balance, beginning of year 21,022 17,504  
Charge-offs (1,042) (2,056)  
Recoveries 46 89  
Provision 5,482 5,485  
Balance, end of year 25,508 21,022 17,504
Individually Evaluated for Impairment 1,887 1,163  
Collectively Evaluated for Impairment 23,621 19,859  
Ending Balance 3,422,589 2,928,808  
Individually Evaluated for Impairment 18,637 12,404  
Collectively Evaluated for Impairment 3,403,952 2,916,404  
Consumer Portfolio Segment [Member]      
Balance, beginning of year 515 392  
Charge-offs (283) (310)  
Recoveries 38 26  
Provision 284 407  
Balance, end of year 554 515 $ 392
Individually Evaluated for Impairment 49 50  
Collectively Evaluated for Impairment 505 465  
Ending Balance 64,493 62,213  
Individually Evaluated for Impairment 49 88  
Collectively Evaluated for Impairment $ 64,444 $ 62,125