CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss, Net of Deferred Taxes [Member]	Unearned Restricted Stock Award Common Stock [Member]	Common Stock Held by BMP [Member]	Treasury Stock [Member]	ESOP [Member]	Total
Balance at Dec. 31, 2010	$ 512	$ 225,585	$ 329,668	$ (6,352)	$ (2,684)	$ (7,979)	$ (206,546)	$ (3,470)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income recognized during the period, net of tax				(3,357)					(3,357)
Stock options exercised	4	3,665
Excess Tax benefit of stock benefit plans		431
Amortization of excess fair value over cost - ESOP stock and stock options expense		1,337
Release from treasury stock for restricted stock award and BMP award shares, net of return of shares to treasury for forfeited shares (150,173 shares, 169,376 shares and 109,824 shares during the years ended December 31, 2012, 2011, and 2010, respectively)		503			(1,931)	(676)	2,104
Net income for the period			47,309						47,309
Cash dividends declared and paid			(18,898)
Amortization of earned portion of ESOP stock								231
Amortization of earned portion of restricted stock awards					1,578
Balance at Dec. 31, 2011	516	231,521	358,079	(9,709)	(3,037)	(8,655)	(204,442)	(3,239)	361,034
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income recognized during the period, net of tax				69					69
Stock options exercised	4	5,604
Excess Tax benefit of stock benefit plans		389
Amortization of excess fair value over cost - ESOP stock and stock options expense		1,168
Release from treasury stock for restricted stock award and BMP award shares, net of return of shares to treasury for forfeited shares (150,173 shares, 169,376 shares and 109,824 shares during the years ended December 31, 2012, 2011, and 2010, respectively)		359			(1,927)	(145)	1,858
Net income for the period			40,308						40,308
Cash dividends declared and paid			(19,221)
Amortization of earned portion of ESOP stock								232
Amortization of earned portion of restricted stock awards					1,842
Balance at Dec. 31, 2012	520	239,041	379,166	(9,640)	(3,122)	(8,800)	(202,584)	(3,007)	391,574
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income recognized during the period, net of tax				4,881					4,881
Stock options exercised	8	11,220
Excess Tax benefit of stock benefit plans		292
Amortization of excess fair value over cost - ESOP stock and stock options expense		1,176
Release from treasury stock for restricted stock award and BMP award shares, net of return of shares to treasury for forfeited shares (150,173 shares, 169,376 shares and 109,824 shares during the years ended December 31, 2012, 2011, and 2010, respectively)		524			(2,082)	(213)	2,064
Net income for the period			43,548						43,548
Cash dividends declared and paid			(19,728)
Amortization of earned portion of ESOP stock								231
Amortization of earned portion of restricted stock awards					2,011
Balance at Dec. 31, 2013	$ 528	$ 252,253	$ 402,986	$ (4,759)	$ (3,193)	$ (9,013)	$ (200,520)	$ (2,776)	$ 435,506