Condensed Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Parent [Member]
Balance at Dec. 31, 2012		$ 0	$ 181	$ (1,743)	$ 173,299	$ 56,218	$ 7,790	$ 235,745
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,073	0	0	0	0	21,073	0	21,073
Total comprehensive income	10,736	0	0	0	0	0	(10,337)	(10,337)
Cash dividends paid on common shares, $0.1575 per share		0	0	0	0	(1,904)	0	(1,904)
Repurchase of common stock warrants	(1,006)	0	0	0	(1,006)	0	0	(1,006)
Issuance under equity compensation plans, net		0	2	0	2,262	0	0	2,264
Stock Issued During Period, Value, Conversion of Convertible Securities	0
Share-based compensation		0	0	0	1,788	0	0	1,788
Excess tax benefit related to equity compensation plans		0	0	0	52	0	0	52
Balance at Jun. 30, 2013		0	183	(1,743)	176,395	75,387	(2,547)	247,675
Balance at Dec. 31, 2013	279,705	0	194	(1,743)	200,258	85,376	(4,380)	279,705
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,008	0	0	0	0	13,008	0	13,008
Total comprehensive income	17,967	0	0	0	0	0	4,959	4,959
Cash dividends paid on common shares, $0.1575 per share		0	0	0	0	(2,086)	0	(2,086)
Repurchase of common stock warrants	0
Issuance under equity compensation plans, net		0	1	0	(650)	0	0	(649)
Stock Issued During Period, Value, Conversion of Convertible Securities	5,002	0	3	0	4,999	0	0	5,002
Share-based compensation		0	0	0	1,524	0	0	1,524
Excess tax benefit related to equity compensation plans		0	0	0	101	0	0	101
Balance at Jun. 30, 2014	$ 301,564	$ 0	$ 198	$ (1,743)	$ 206,232	$ 96,298	$ 579	$ 301,564