Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2012	$ 269,475	$ 18,507	$ 212,090	$ 38,314	$ 1,064	$ (500)
Beginning balance, shares at Dec. 31, 2012		18,459,502
Net income	7,189			7,189
Other comprehensive income (loss)	(710)				(710)
Share-based compensation expense	704		704
Issuance of common stock under share-based-compensation arrangements	252	24	228
Issuance of common stock under share-based-compensation arrangements, Shares		23,411
Ending balance at Mar. 31, 2013	276,910	18,531	213,022	45,503	354	(500)
Ending balance, shares at Mar. 31, 2013		18,482,913
Beginning balance at Dec. 31, 2013	386,623	24,756	307,231	71,008	(8,118)	(8,254)
Beginning balance, shares at Dec. 31, 2013	24,224,151	24,224,151
Net income	8,136			8,136
Other comprehensive income (loss)	4,520				4,520
Share-based compensation expense	955		955
Issuance of common stock under share-based-compensation arrangements	704	70	634
Issuance of common stock under share-based-compensation arrangements, Shares		70,013
Ending balance at Mar. 31, 2014	$ 400,938	$ 24,826	$ 308,820	$ 79,144	$ (3,598)	$ (8,254)
Ending balance, shares at Mar. 31, 2014	24,294,164	24,294,164