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Loans and Credit Quality - Activity in Allowance for Credit Losses by Loan Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Allowance for credit losses by loan portfolio        
Beginning Balance $ 36,042 $ 32,423 $ 35,264 $ 30,659
Charge-offs (204) (204) (529) (398)
Recoveries 1,132 682 2,235 1,240
Provision for (Reversal of) credit losses 500 1,100 500 2,500
Ending Balance 37,470 34,001 37,470 34,001
Consumer Loans [Member]        
Allowance for credit losses by loan portfolio        
Beginning Balance 14,500 13,878 14,349 13,562
Charge-offs (188) (204) (513) (330)
Recoveries 750 89 1,369 424
Provision for (Reversal of) credit losses 82 (69) (61) 38
Ending Balance 15,144 13,694 15,144 13,694
Consumer Loans [Member] | Single Family [Member]        
Allowance for credit losses by loan portfolio        
Beginning Balance 7,954 9,026 8,196 8,942
Charge-offs (2) 0 (2) (32)
Recoveries 683 2 1,016 86
Provision for (Reversal of) credit losses (347) (734) (922) (702)
Ending Balance 8,288 8,294 8,288 8,294
Consumer Loans [Member] | Home Equity and Other [Member]        
Allowance for credit losses by loan portfolio        
Beginning Balance 6,546 4,852 6,153 4,620
Charge-offs (186) (204) (511) (298)
Recoveries 67 87 353 338
Provision for (Reversal of) credit losses 429 665 861 740
Ending Balance 6,856 5,400 6,856 5,400
Commercial Loans [Member]        
Allowance for credit losses by loan portfolio        
Beginning Balance 21,542 18,545 20,915 17,097
Charge-offs (16) 0 (16) (68)
Recoveries 382 593 866 816
Provision for (Reversal of) credit losses 418 1,169 561 2,462
Ending Balance 22,326 20,307 22,326 20,307
Commercial Loans [Member] | Commercial Real Estate [Member]        
Allowance for credit losses by loan portfolio        
Beginning Balance 7,036 5,175 6,680 4,847
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision for (Reversal of) credit losses 419 870 775 1,198
Ending Balance 7,455 6,045 7,455 6,045
Commercial Loans [Member] | Multifamily [Member]        
Allowance for credit losses by loan portfolio        
Beginning Balance 3,793 1,832 3,086 1,194
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision for (Reversal of) credit losses 266 216 973 854
Ending Balance 4,059 2,048 4,059 2,048
Commercial Loans [Member] | Construction/Land Development [Member]        
Allowance for credit losses by loan portfolio        
Beginning Balance 8,069 9,286 8,553 9,271
Charge-offs 0 0 0 (42)
Recoveries 214 573 434 783
Provision for (Reversal of) credit losses (57) (490) (761) (643)
Ending Balance 8,226 9,369 8,226 9,369
Commercial Loans [Member] | Commercial Business [Member]        
Allowance for credit losses by loan portfolio        
Beginning Balance 2,644 2,252 2,596 1,785
Charge-offs (16) 0 (16) (26)
Recoveries 168 20 432 33
Provision for (Reversal of) credit losses (210) 573 (426) 1,053
Ending Balance $ 2,586 $ 2,845 $ 2,586 $ 2,845