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		1	812
Forfeited restricted stock award shares returned to treasury stock			(3)				32	(29)
Tax benefit of stock plans			189
BMP award distribution									0
Amortization of excess fair value over cost - ESOP stock and stock options expense			733
Release from treasury stock for benefit plan awards			217				(1,959)	1,887	(145)
Net income	21,778			21,778
Cash dividends declared and paid				(9,563)
Amortization and reversal of net unrealized loss on securities transferred from available-for-sale to held-to-maturity, net of tax					78
Reduction in non credit component of OTTI charge, net of taxes	154				154
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					(241)
Adjustments to other comprehensive income from defined benefit plans, net of tax	(312)				312
Amortization of earned portion of ESOP stock						116
Amortization of earned portion of restricted stock awards							899
Balance at Jun. 30, 2012	376,299	517	233,469	370,294	(9,409)	(3,123)	(4,065)	(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		2	2,283
Forfeited restricted stock award shares returned to treasury stock			0				0	0
Tax benefit of stock plans			201
BMP award distribution									0
Amortization of excess fair value over cost - ESOP stock and stock options expense			566
Release from treasury stock for benefit plan awards			514				(2,082)	2,034	(213)
Net income	22,609			22,609
Cash dividends declared and paid				(9,786)
Amortization and reversal of net unrealized loss on securities transferred from available-for-sale to held-to-maturity, net of tax					62
Reduction in non credit component of OTTI charge, net of taxes	8				8
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					6
Adjustments to other comprehensive income from defined benefit plans, net of tax	0				0
Amortization of earned portion of ESOP stock						115
Amortization of earned portion of restricted stock awards							1,012
Balance at Jun. 30, 2013	$ 408,905	$ 522	$ 242,605	$ 391,989	$ (9,564)	$ (2,892)	$ (4,192)	$ (200,550)	$ (9,013)