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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Balance, beginning of period $ 62,050 $ 53,892 $ 59,406 [1] $ 51,893  
Charge-offs (2,219) (3,246) (3,776) (6,442)  
Recoveries 287 32 349 241  
Provision 4,121 4,381 8,260 9,367  
Balance, end of period 64,239 55,059 64,239 55,059  
Individually Evaluated for Impairment 5,877   5,877   $ 5,609
Collectively Evaluated for Impairment 58,362   58,362   53,797
Ending Balance 6,129,649   6,129,649   5,851,261 [1]
Individually Evaluated for Impairment 37,975   37,975   40,510
Collectively Evaluated for Impairment 6,091,674   6,091,674   5,810,751
Commercial Real Estate Portfolio Segment [Member]          
Balance, beginning of period 35,787 28,707 32,880 28,872  
Charge-offs (1,732) (3,067) (2,820) (5,922)  
Recoveries 173 16 177 206  
Provision 1,950 3,471 5,941 5,971  
Balance, end of period 36,178 29,127 36,178 29,127  
Individually Evaluated for Impairment 5,423   5,423   4,276
Collectively Evaluated for Impairment 30,755   30,755   28,604
Ending Balance 2,345,879   2,345,879   2,279,366
Individually Evaluated for Impairment 20,063   20,063   26,447
Collectively Evaluated for Impairment 2,325,816   2,325,816   2,252,919
Real Estate Portfolio Segment[Member]          
Ending Balance 3,193,921   3,193,921   2,928,808
Real Estate Portfolio Segment[Member] | Construction Loans [Member]          
Balance, beginning of period 4,138 4,825 4,989 5,125  
Charge-offs (40) (40)  
Recoveries 97 14 104 30  
Provision (173) 339 (1,031) 23  
Balance, end of period 4,062 5,138 4,062 5,138  
Individually Evaluated for Impairment 120   120   120
Collectively Evaluated for Impairment 3,942   3,942   4,869
Ending Balance 522,788   522,788   580,874
Individually Evaluated for Impairment 1,623   1,623   1,571
Collectively Evaluated for Impairment 521,165   521,165   579,303
Real Estate Portfolio Segment[Member] | Real Estate Loan [Member]          
Balance, beginning of period 21,606 19,962 21,022 17,504  
Charge-offs (440) (106) (821) (372)  
Recoveries 2 2 44 4  
Provision 2,270 534 3,193 3,256  
Balance, end of period 23,438 20,392 23,438 20,392  
Individually Evaluated for Impairment 285   285   1,163
Collectively Evaluated for Impairment 23,153   23,153   19,859
Ending Balance 3,193,921   3,193,921   2,928,808
Individually Evaluated for Impairment 16,240   16,240   12,404
Collectively Evaluated for Impairment 3,177,681   3,177,681   2,916,404
Consumer Portfolio Segment [Member]          
Balance, beginning of period 519 398 515 392  
Charge-offs (47) (33) (135) (108)  
Recoveries 15 24 1  
Provision 74 37 157 117  
Balance, end of period 561 $ 402 561 $ 402  
Individually Evaluated for Impairment 49   49   50
Collectively Evaluated for Impairment 512   512   465
Ending Balance 67,061   67,061   62,213
Individually Evaluated for Impairment 49   49   88
Collectively Evaluated for Impairment $ 67,012   $ 67,012   $ 62,125
[1] derived from audited financial statements