Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2015	$ 452,116	$ 247,587	$ 206,307	$ (1,778)
Beginning balance, shares at Dec. 31, 2015		22,775,173
Net income	10,674		10,674
Other comprehensive income	3,550			3,550
Stock option vesting	155	$ 155
RSU vesting	120	120
PSU vesting	56	56
Stock options exercised	173	$ 173
Stock options exercised, shares		10,000
Tax benefit of stock options exercised	10	$ 10
Dividends paid	(3,418)		(3,418)
Ending balance at Mar. 31, 2016	463,436	$ 248,101	213,563	1,772
Ending balance, shares at Mar. 31, 2016		22,785,173
Beginning balance at Dec. 31, 2016	$ 477,347	$ 252,820	232,440	(7,913)
Beginning balance, shares at Dec. 31, 2016	22,867,802	22,867,802
Net income	$ 12,079		12,079
Other comprehensive income	511			511
Stock option vesting	88	$ 88
RSU vesting	204	204
PSU vesting	89	89
Stock options exercised	$ 435	$ 435
Stock options exercised, shares	21,450	21,450
RSUs released
RSUs released, shares		304
Repurchase of common stock, value	(604)	$ (180)	(424)
Repurchase of common stock, shares		(16,251)
Dividends paid	(3,431)		(3,431)
Ending balance at Mar. 31, 2017	$ 486,718	$ 253,456	$ 240,664	$ (7,402)
Ending balance, shares at Mar. 31, 2017	22,873,305	22,873,305