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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 4,548   4,548  
Other comprehensive income (loss) $ 1,011     1,011
Stock options exercised, net of shares surrendered for cashless exercises and tax withholdings (in shares) 5,285      
Stock options exercised, net of shares surrendered for cashless exercises and tax withholdings $ 28      
Stock issued under employee stock purchase plan (in shares)   154    
Stock issued under employee stock purchase plan 9 $ 9    
Restricted stock granted (in shares)   14,230    
Restricted stock granted 0 $ 0    
Stock-based compensation - stock options 174 174    
Stock-based compensation - restricted stock 204 $ 204    
Cash dividends paid on common stock (1,655)   (1,655)  
Stock purchased by directors under director stock plan (in shares)   315    
Stock purchased by directors under director stock plan 22 $ 22    
Stock issued in payment of director fees (in shares)   1,188    
Stock issued in payment of director fees $ 82 $ 82    
Balance (in shares) at Mar. 31, 2017 6,127,314 6,148,486    
Balance at Mar. 31, 2017 $ 234,986 $ 87,911 $ 149,357 $ (2,282)