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]	Common Stock Held by BMP [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2013		$ 528	$ 252,253	$ 402,986	$ (4,759)	$ (2,776)	$ (3,193)	$ (9,013)	$ (200,520)
Stock options exercised		1	278
Tax benefit of stock plans			71
BMP award distribution								1
Amortization of excess fair value over cost - ESOP stock and stock options expense			847
Release from treasury stock for equity awards, net of return of shares to treasury for forfeited shares			654				(1,930)	(152)	1,598
Release of stock for benefit plan awards	$ (171)
Net income	32,259			32,259
Cash dividends declared and paid				(15,075)
Reduction in non credit component of OTTI charge, net of taxes	11
Other comprehensive income recognized during the period, net of tax	(475)				475
Amortization of earned portion of ESOP stock						173
Amortization of earned portion of restricted stock awards							1,497
Treasury shares repurchased	0
Balance at Sep. 30, 2014	456,203	529	254,103	420,170	(4,284)	(2,603)	(3,626)	(9,164)	(198,922)
Balance at Dec. 31, 2014	459,725	529	254,358	427,126	(8,547)	(2,545)	(3,066)	(9,164)	(198,966)
Stock options exercised		3	4,053
Tax benefit of stock plans			204
BMP award distribution								0
Amortization of excess fair value over cost - ESOP stock and stock options expense			815
Release from treasury stock for equity awards, net of return of shares to treasury for forfeited shares			476				(1,061)	(190)	988
Release of stock for benefit plan awards	(213)
Net income	33,388			33,388
Cash dividends declared and paid				(15,188)
Reduction in non credit component of OTTI charge, net of taxes	(10)
Other comprehensive income recognized during the period, net of tax	626				(626)
Amortization of earned portion of ESOP stock						174
Amortization of earned portion of restricted stock awards							1,418
Treasury shares repurchased	(300)								(300)
Balance at Sep. 30, 2015	$ 483,879	$ 532	$ 259,906	$ 445,326	$ (9,173)	$ (2,371)	$ (2,709)	$ (9,354)	$ (198,278)