Consolidated Statements Of Changes In Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Employee Stock Ownership Plan [Member]	Treasury Stock [Member]	Common Stock Acquired By Deferred Compensation Plan [Member]	Deferred Compensation Plan Liability [Member]	Total
Balance at Dec. 31, 2008		$ 272	$ 204,298	$ 160,267	$ (14,462)	$ (5,069)	$ (225,523)	$ 981	$ (981)	$ 119,783
Comprehensive income:
Net income				15,653						15,653
Other comprehensive income:
Unrealized gain on securities (net of tax expense)					3,709					3,709
Total comprehensive income										19,362
Proceeds from issuance of preferred stock and warrants	36,921		1,342							38,263
Redemption of preferred stock	(38,263)									(38,263)
Net proceeds from common stock offering		64	54,184							54,248
Accretion of discount on preferred stock and redemption charge	1,342			(1,342)
Treasury stock allocated to restricted stock Plan			(694)	(221)			915
Stock awards			734							734
Tax (expense) benefit of stock plans			150							150
Allocation of ESOP stock			116			293				409
Cash dividend				(9,417)						(9,417)
Cash dividend on preferred stock				(1,828)						(1,828)
Exercise of stock options				(49)			144			95
Sale of stock for the deferred compensation plan, net								5	(5)
Balance at Dec. 31, 2009		336	260,130	163,063	(10,753)	(4,776)	(224,464)	986	(986)	183,536
Comprehensive income:
Net income				20,378						20,378
Other comprehensive income:
Unrealized gain on securities (net of tax expense)					5,193					5,193
Total comprehensive income										25,571
Redemption of warrants			(431)							(431)
Expenses of common stock offering			(108)							(108)
Stock awards			1,047							1,047
Tax (expense) benefit of stock plans			(23)							(23)
Allocation of ESOP stock			124			292				416
Cash dividend				(8,764)						(8,764)
Exercise of stock options							7			7
Sale of stock for the deferred compensation plan, net								(40)	40
Balance at Dec. 31, 2010		336	260,739	174,677	(5,560)	(4,484)	(224,457)	946	(946)	201,251
Comprehensive income:
Net income				20,741						20,741
Other comprehensive income:
Unrealized gain on securities (net of tax expense)					3,004					3,004
Reclassification adjustment for losses included in net income (net of tax benefit $60)					88					88
Total comprehensive income										23,833
Treasury stock allocated to restricted stock Plan			(293)	38			255
Stock awards			904							904
Tax (expense) benefit of stock plans			1,303							1,303
Allocation of ESOP stock			159			291				450
Cash dividend				(8,789)						(8,789)
Exercise of stock options				(1)			45			44
Purchase of 165,154 shares of common stock							(2,147)			(2,147)
Sale of stock for the deferred compensation plan, net								(75)	75
Balance at Dec. 31, 2011		$ 336	$ 262,812	$ 186,666	$ (2,468)	$ (4,193)	$ (226,304)	$ 871	$ (871)	$ 216,849