UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss, net of tax [Member]	ESOP [Member]	Unearned Restricted Stock Award Common Stock [Member]	Treasury Stock [Member]	Common Stock Held by BMP [Member]
Balance at Dec. 31, 2010		$ 512	$ 225,585	$ 329,668	$ (6,352)	$ (3,470)	$ (2,684)	$ (206,546)	$ (7,979)
Stock options exercised		1	903
Tax benefit (expense) of stock plans			111
BMP award distribution									0
Amortization of excess fair value over cost - ESOP stock and stock options expense			462
Release from treasury stock for restricted stock award and BMP benefit shares								0
Net income	11,080			11,080
Cash dividends declared and paid				(4,688)
Amortization and reversal of net unrealized loss on securities transferred from available-for-sale to held-to-maturity, net of tax					14
Reduction in non-credit component of OTTI charge, net of tax	336				336
Change in unrealized gain or loss on available-for-sale securities during the period					(324)
Adjustments to other comprehensive income from defined benefit plans, net of tax	27				27
Amortization of earned portion of ESOP stock						58
Amortization of earned portion of restricted stock awards							308
Balance at Mar. 31, 2011		513	227,061	336,060	(6,299)	(3,412)	(2,376)	(206,546)	(7,979)
Balance at Dec. 31, 2011	361,034	516	231,521	358,079	(9,709)	(3,239)	(3,037)	(204,442)	(8,655)
Stock options exercised			592
Tax benefit (expense) of stock plans			91
BMP award distribution									0
Amortization of excess fair value over cost - ESOP stock and stock options expense			302
Release from treasury stock for restricted stock award and BMP benefit shares								0
Net income	10,247			10,247
Cash dividends declared and paid				(4,767)
Amortization and reversal of net unrealized loss on securities transferred from available-for-sale to held-to-maturity, net of tax					25
Reduction in non-credit component of OTTI charge, net of tax	5				5
Non-credit component of OTTI charge recognized during the period, net of tax					(3)
Change in unrealized gain or loss on available-for-sale securities during the period					35
Adjustments to other comprehensive income from defined benefit plans, net of tax	312				312
Amortization of earned portion of ESOP stock						58
Amortization of earned portion of restricted stock awards							438
Balance at Mar. 31, 2012	$ 368,369	$ 516	$ 232,506	$ 363,559	$ (9,335)	$ (3,181)	$ (2,599)	$ (204,442)	$ (8,655)