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		3	4,083
Forfeited restricted stock award shares returned to treasury stock			(3)				32	(29)
Tax benefit of stock plans			349
Amortization of excess fair value over cost - ESOP stock and stock options expense			1,025
Release from treasury stock for benefit plan awards			217				(1,959)	1,887	(145)
Net income	33,573			33,573
Cash dividends declared and paid				(14,386)
Reduction in non credit component of OTTI charge, net of taxes	161
Other comprehensive income recognized during the period, net of tax	(313)				313
Amortization of earned portion of ESOP stock						174
Amortization of earned portion of restricted stock awards							1,370
Balance at Sep. 30, 2012	387,538	519	237,192	377,266	(9,396)	(3,065)	(3,594)	(202,584)	(8,800)
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		6	8,972
Forfeited restricted stock award shares returned to treasury stock			0				0	0
Tax benefit of stock plans			704
Amortization of excess fair value over cost - ESOP stock and stock options expense			874
Release from treasury stock for benefit plan awards			514				(2,082)	2,034	(213)
Net income	33,240			33,240
Cash dividends declared and paid				(14,742)
Reduction in non credit component of OTTI charge, net of taxes	12
Other comprehensive income recognized during the period, net of tax	(180)				180
Amortization of earned portion of ESOP stock						173
Amortization of earned portion of restricted stock awards							1,511
Balance at Sep. 30, 2013	$ 422,745	$ 526	$ 250,105	$ 397,664	$ (9,460)	$ (2,834)	$ (3,693)	$ (200,550)	$ (9,013)