CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Preferred Stock	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Stockholders' Equity, Balance at Dec. 31, 2009	$ 54,095	$ 83,487	$ 149,945	$ (5,993)	$ (1,540)	$ 279,994
Comprehensive income:
Net income			24,543			24,543
Other comprehensive income (loss), net of tax				7,343		7,343
Comprehensive income						31,886
Common stock cash dividends declared, per share			(9,989)			(9,989)
Treasury shares purchased under deferred directors' plan		212			(212)	0
Treasury stock sold and distributed under deferred directors' plan		(334)			334	0
Stock activity under stock compensation plans		1,662				1,662
Stock compensation expense		739				739
Redemption of shares of preferred stock	(56,044)					(56,044)
Accretion of preferred stock discount	1,949		(1,949)			0
Preferred stock dividend paid and/or accrued			(1,251)			(1,251)
Stockholders' Equity, Balance at Dec. 31, 2010	0	85,766	161,299	1,350	(1,418)	246,997
Comprehensive income:
Net income			30,662			30,662
Other comprehensive income (loss), net of tax				3,789		3,789
Comprehensive income						34,451
Common stock cash dividends declared, per share			(10,058)			(10,058)
Treasury shares purchased under deferred directors' plan		244			(244)	0
Treasury stock sold and distributed under deferred directors' plan		(440)			440	0
Stock activity under stock compensation plans		468				468
Stock compensation expense		1,342				1,342
Stockholders' Equity, Balance at Dec. 31, 2011	0	87,380	181,903	5,139	(1,222)	273,200
Comprehensive income:
Net income			35,394			35,394
Other comprehensive income (loss), net of tax				550		550
Comprehensive income						35,944
Common stock cash dividends declared, per share			(13,643)			(13,643)
Treasury shares purchased under deferred directors' plan		421			(421)	0
Stock activity under stock compensation plans		894				894
Stock compensation expense		1,344				1,344
Stockholders' Equity, Balance at Dec. 31, 2012	$ 0	$ 90,039	$ 203,654	$ 5,689	$ (1,643)	$ 297,739