Consolidated Statement of Changes in Stockholders Equity (USD $) In Thousands		Total	Preferred Stock [Member]	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2009		$ 301,800	$ 1	$ 166	$ 166,627	$ (2,022)	$ 385,308	$ (248,280)
Net income		14,117					14,117
Other comprehensive income		8,546				8,546
Cash dividend, $0.48 per share		(3,575)					(3,575)
Issuance of common stock including proceeds from exercise of common stock options		48,763		14	48,749
Stock-based compensation expense		269			269
Issuance of restricted stock		192			192
Tax benefit from exercises of common stock options	[1]	341			341
Preferred stock cash dividends		(2,631)					(2,631)
Preferred stock discount accretion		(139)			138		(138)
Ending Balance at Dec. 31, 2010		367,822	1	180	216,316	6,524	393,081	(248,280)
Net income		22,677					22,677
Other comprehensive income		4,678				4,678
Cash dividend, $0.48 per share		(4,126)					(4,126)
Issuance of common stock including proceeds from exercise of common stock options		1,124		2	1,122
Stock-based compensation expense		1,343			1,343
Issuance of restricted stock		470			470
Tax benefit from exercises of common stock options	[1]	776			776
Preferred stock cash dividends		(2,631)					(2,631)
Preferred stock discount accretion		(139)			136		(136)
Ending Balance at Dec. 31, 2011		392,133	1	182	220,163	11,202	408,865	(248,280)
Net income		31,311					31,311
Other comprehensive income		1,741				1,741
Cash dividend, $0.48 per share		(4,179)					(4,179)
Issuance of common stock including proceeds from exercise of common stock options	[1]	2,503		2	2,501
Stock-based compensation expense		1,577			1,577
Tax benefit from exercises of common stock options		399			399
Preferred stock cash dividends		(2,631)					(2,631)
Preferred stock discount accretion		(139)			138		(138)
Repurchase of warrant		(1,800)			(1,800)
Ending Balance at Dec. 31, 2012		$ 421,054	$ 1	$ 184	$ 222,978	$ 12,943	$ 433,228	$ (248,280)

[1] Net of deferred tax adjustments for expired options