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, 2011		$ 516	$ 231,521	$ 358,079	$ (9,709)	$ (3,239)	$ (3,037)	$ (204,442)	$ (8,655)
Stock options exercised		0	592
Tax benefit of stock plans			91
Amortization of excess fair value over cost - ESOP stock and stock options expense			302
Release from treasury stock for benefit plan awards								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 taxes	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)
Balance at Dec. 31, 2012	391,574	520	239,041	379,166	(9,640)	(3,007)	(3,122)	(202,584)	(8,800)
Stock options exercised		2	2,060
Tax benefit of stock plans			71
Amortization of excess fair value over cost - ESOP stock and stock options expense			292
Release from treasury stock for benefit plan awards								10
Net income	10,570			10,570
Cash dividends declared and paid				(4,881)
Amortization and reversal of net unrealized loss on securities transferred from available-for-sale to held-to-maturity, net of tax					34
Reduction in non credit component of OTTI charge, net of taxes	4				4
Non-credit component of OTTI charge recognized during the period, net of tax					0
Change in unrealized gain or loss on available-for-sale securities during the period					181
Adjustments to other comprehensive income from defined benefit plans, net of tax	0				0
Amortization of earned portion of ESOP stock						57
Amortization of earned portion of restricted stock awards							526
Balance at Mar. 31, 2013	$ 400,500	$ 522	$ 241,464	$ 384,855	$ (9,421)	$ (2,950)	$ (2,596)	$ (202,574)	$ (8,800)