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, 2011		$ 33,293	$ 178	$ (1,743)	$ 169,138	$ 35,097	$ 3,602	$ 239,565
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,881	0	0	0	0	22,881	0	22,881
Total comprehensive income	28,667	0	0	0	0	0	5,786	5,786
Cash dividends paid on common shares, $0.1575 per share		0	0	0	0	(2,813)	0	(2,813)
Cash dividends paid on preferred stock		0	0	0	0	(1,312)	0	(1,312)
Preferred stock accretion of discount		621	0	0	0	(621)	0	0
Issuance under equity compensation plans, net		0	2	0	1,530	0	0	1,532
Stock Issued During Period, Value, Conversion of Convertible Securities	0
Share-based compensation		0	0	0	1,791	0	0	1,791
Excess tax benefit related to equity compensation plans		0	0	0	86	0	0	86
Balance at Sep. 30, 2012		33,914	180	(1,743)	172,545	53,232	9,388	267,516
Balance at Dec. 31, 2012	235,745	0	181	(1,743)	173,299	56,218	7,790	235,745
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	29,483	0	0	0	0	29,483	0	29,483
Total comprehensive income	19,712	0	0	0	0	0	(9,771)	(9,771)
Cash dividends paid on common shares, $0.1575 per share		0	0	0	0	(2,924)	0	(2,924)
Repurchase of common stock warrants		0	0	0	(1,006)	0	0	(1,006)
Issuance under equity compensation plans, net		0	1	0	2,550	0	0	2,551
Stock Issued During Period, Value, Conversion of Convertible Securities	20,443	0	12	0	20,431	0	0	20,443
Share-based compensation		0	0	0	3,136	0	0	3,136
Excess tax benefit related to equity compensation plans		0	0	0	83	0	0	83
Balance at Sep. 30, 2013	$ 277,740	$ 0	$ 194	$ (1,743)	$ 198,493	$ 82,777	$ (1,981)	$ 277,740