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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss), Net of Taxes
Balance (in shares) at Dec. 31, 2015   6,068,543    
Balance at Dec. 31, 2015 $ 214,473 $ 84,727 $ 129,553 $ 193
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 23,134   23,134  
Other comprehensive income (loss) (3,486)     (3,486)
Stock options exercised (in shares)   36,117    
Stock options exercised 1,227 $ 1,227    
Excess tax benefit - stock-based compensation 161 $ 161    
Stock issued under employee stock purchase plan (in shares)   621    
Stock issued under employee stock purchase plan 32 $ 32    
Restricted stock granted (in shares)   16,910    
Restricted stock granted 0 $ 0    
Stock-based compensation - stock options 347 347    
Stock-based compensation - restricted stock 638 $ 638    
Cash dividends paid on common stock (6,223)   (6,223)  
Stock purchased by directors under director stock plan (in shares)   516    
Stock purchased by directors under director stock plan 26 $ 26    
Stock issued in payment of director fees (in shares)   4,607    
Stock issued in payment of director fees $ 234 $ 234    
Balance (in shares) at Dec. 31, 2016 6,127,314 6,127,314    
Balance at Dec. 31, 2016 $ 230,563 $ 87,392 146,464 (3,293)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income 14,866   14,866  
Other comprehensive income (loss) 2,063     2,063
Stock options exercised, net of shares surrendered for cashless exercises and tax withholdings (in shares)   8,786    
Stock options exercised, net of shares surrendered for cashless exercises and tax withholdings 28 $ 28    
Stock issued under employee stock purchase plan (in shares)   280    
Stock issued under employee stock purchase plan 17 $ 17    
Stock issued to employee stock ownership plan (in shares)   21,732    
Stock issued to employee stock ownership plan (ESOP) 1,335 $ 1,335    
Restricted stock granted (in shares)   14,230    
Restricted stock granted 0 $ 0    
Stock-based compensation - stock options 423 423    
Stock-based compensation - restricted stock 634 $ 634    
Cash dividends paid on common stock (5,103)   (5,103)  
Stock purchased by directors under director stock plan (in shares)   531    
Stock purchased by directors under director stock plan 35 $ 35    
Stock issued in payment of director fees (in shares)   2,878    
Stock issued in payment of director fees $ 188 $ 188    
Balance (in shares) at Sep. 30, 2017 6,175,751 6,175,751    
Balance at Sep. 30, 2017 $ 245,049 $ 90,052 $ 156,227 $ (1,230)