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, 2012	$ 134,587	$ 0	$ 3,000	$ 33,805	$ 95,856	$ 1,926
Common stock, shares outstanding at Dec. 31, 2012			17,403,882
Stockholders' Equity [Roll Forward]
Net income	16,891	0	$ 0	0	16,891	0
Other comprehensive income (loss), net of tax	(5,464)	0	0	0	0	(5,464)
Cash dividends declared, common stock	(6,995)	0	0	0	(6,995)	0
Repurchase and cancellation of common stock, value	(15,774)	0	$ 0	(15,774)	0	0
Repurchase and cancellation of common stock, shares			(1,440,592)
Stock-based compensation costs	378	0	$ 0	378	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, value	(14)	0	$ 0	(14)	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, shares			12,914
Excess tax benefits from vesting of restricted stock units	16	0	$ 0	16	0	0
Balance at Dec. 31, 2013	123,625	0	$ 3,000	18,411	105,752	(3,538)
Common stock, shares outstanding at Dec. 31, 2013			15,976,204
Stockholders' Equity [Roll Forward]
Net income	20,040	0	$ 0	0	20,040	0
Other comprehensive income (loss), net of tax	3,792	0	0	0	0	3,792
Cash dividends declared, common stock	(7,842)	0	0	0	(7,842)	0
Stock-based compensation costs	633	0	0	633	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, value	(189)	0	$ 0	(189)	0	0
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, shares			42,530
Excess tax benefits from vesting of restricted stock units	116	0	$ 0	116	0	0
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		16,018,734
Stockholders' Equity [Roll Forward]
Net income	$ 21,742	0	$ 0	0	21,742	0
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		16,064,435