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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2014 $ 140,175 $ 0 $ 3,000 $ 18,971 $ 117,950 $ 254
Common stock, shares outstanding at Dec. 31, 2014     16,018,734      
Stockholders' Equity [Roll Forward]            
Net income 21,742 0 $ 0 0 21,742 0
Total other comprehensive income (loss), net of tax (684) 0 0 0 0 (684)
Cash dividends declared, common stock (9,952) 0 0 0 (9,952) 0
Stock-based compensation costs 1,166 0 0 1,166 0 0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, value (225) 0 $ 0 (225) 0 0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, shares     45,701      
Excess tax benefits from vesting of restricted stock units 155 0 $ 0 155 0 0
Balance at Dec. 31, 2015 152,377 0 $ 3,000 20,067 129,740 (430)
Common stock, shares outstanding at Dec. 31, 2015     16,064,435      
Stockholders' Equity [Roll Forward]            
Net income 23,016 0 $ 0 0 23,016 0
Total other comprehensive income (loss), net of tax (612) 0 0 0 0 (612)
Cash dividends declared, common stock (10,800) 0 0 0 (10,800) 0
Stock-based compensation costs 1,684 0 0 1,684 0 0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, value (394) 0 $ 0 (394) 0 0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, shares     73,564      
Excess tax benefits from vesting of restricted stock units 105 0 $ 0 105 0 0
Balance at Dec. 31, 2016 $ 165,376 0 $ 3,000 21,462 141,956 (1,042)
Common stock, shares outstanding at Dec. 31, 2016 16,137,999   16,137,999      
Stockholders' Equity [Roll Forward]            
Net income $ 23,070 0 $ 0 0 23,070 0
Total other comprehensive income (loss), net of tax (850) 0 0 0 0 (850)
Cash dividends declared, common stock (11,499) 0 0 0 (11,499) 0
Stock-based compensation costs 2,632 0 0 2,632 0 0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, value (631) 0 $ 0 (631) 0 0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, shares     77,673      
Balance at Dec. 31, 2017 $ 178,098 $ 0 $ 3,000 $ 23,463 $ 153,527 $ (1,892)
Common stock, shares outstanding at Dec. 31, 2017 16,215,672   16,215,672