Consolidated Statements of Changes In Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Unallocated Common Stock Held by the Employee Stock Ownership Plan	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance at Dec. 31, 2009	$ 391,540	$ 456	$ 202,479	$ (15,807)	$ 212,196	$ 12,145	$ (19,929)
Beginning balance (in shares) at Dec. 31, 2009		45,628,211
Comprehensive income:
Net income	13,793				13,793
Other comprehensive income (loss)	(1,235)					(1,235)
ESOP shares allocated or committed to be released	799		180	619
Stock compensation expense	3,020		3,020
Additional tax benefit on equity awards	184		184
Exercise of stock appreciation rights	137				(26)		163
Cash dividends declared ($0.09 in 2012, $0.16 in 2011 and $0.14 in 2010 per common share)	(3,308)				(3,308)
Issuance of restricted stock
Issuance of restricted stock Shares		4,400
Treasury stock (average cost of $13.81 in 2012, $13.52 in 2011 and $13.37 in 2010 per share)	(8,213)						(8,213)
Ending Balance at Dec. 31, 2010	396,717	456	205,863	(15,188)	222,655	10,910	(27,979)
Ending Balance (in shares) at Dec. 31, 2010		45,632,611
Comprehensive income:
Net income	16,823				16,823
Other comprehensive income (loss)	6,560					6,560
ESOP shares allocated or committed to be released	824		206	618
Stock compensation expense	3,047		3,047
Additional tax benefit on equity awards	186		186
Exercise of stock appreciation rights	15				(1)		16
Cash dividends declared ($0.09 in 2012, $0.16 in 2011 and $0.14 in 2010 per common share)	(3,701)				(3,701)
Treasury stock (average cost of $13.81 in 2012, $13.52 in 2011 and $13.37 in 2010 per share)	(37,821)						(37,821)
Ending Balance at Dec. 31, 2011	382,650	456	209,302	(14,570)	235,776	17,470	(65,784)
Beginning balance (in shares) at Dec. 31, 2011		45,632,611
Comprehensive income:
Net income	16,031				16,031
Other comprehensive income (loss)	761					761
ESOP shares allocated or committed to be released	878		273	605
Stock compensation expense	3,029		3,029
Additional tax benefit on equity awards	204		204
Common stock issued to complete merger (in shares)		1,271,675
Common stock issued to complete merger	17,458	13	17,445
Exercise of stock appreciation rights	(72)				(193)		121
Cash dividends declared ($0.09 in 2012, $0.16 in 2011 and $0.14 in 2010 per common share)	(1,722)				(1,722)
Treasury stock (average cost of $13.81 in 2012, $13.52 in 2011 and $13.37 in 2010 per share)	(4,344)						(4,344)
Ending Balance at Dec. 31, 2012	$ 414,873	$ 469	$ 230,253	$ (13,965)	$ 249,892	$ 18,231	$ (70,007)
Ending Balance (in shares) at Dec. 31, 2012		46,904,286