Consolidated Statement of Changes in Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Unearned Compensation- ESOP	Unearned Compensation- Equity Incentive Plan	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
BEGINNING BALANCE at Dec. 31, 2011	$ 218,988	$ 269	$ 173,615	$ (9,119)	$ (1,228)	$ 47,735	$ 7,716
BEGINNING BALANCE (in shares) at Dec. 31, 2011		26,918,250
Net income	4,700					4,700
Other comprehensive income (loss)	5,751						5,751
Common stock held by ESOP committed to be released (81,803 shares in 2013 and 84,261 shares in 2012)	482		58	424
Share-based compensation - stock options	577		577
Share-based compensation - equity incentive plan	858				858
Excess tax benefits from equity incentive plan	11		11
Common stock repurchased (in shares)		(1,858,708)
Common stock repurchased	(13,946)	(18)	(13,928)
Issuance of common stock in connection with stock option exercises (in shares)	237,313	237,313
Issuance of common stock in connection with stock option exercises	1,041	2	1,943			(904)
Excess tax benefits from stock option exercises	240		240
Cash dividends declared ($0.23 per share in 2013 and $0.28 per share in 2012)	(7,045)					(7,045)
ENDING BALANCE at Sep. 30, 2012	211,657	259	162,516	(8,695)	(370)	44,721	13,467
ENDING BALANCE (in shares) at Sep. 30, 2012		25,296,855
BEGINNING BALANCE at Dec. 31, 2012	189,187	228	144,718	(8,553)	(265)	42,364	10,695
BEGINNING BALANCE (in shares) at Dec. 31, 2012		22,843,722
Net income	4,946					4,946
Other comprehensive income (loss)	(14,507)						(14,507)
Common stock held by ESOP committed to be released (81,803 shares in 2013 and 84,261 shares in 2012)	455		43	412
Share-based compensation - stock options	128		128
Share-based compensation - equity incentive plan	96				96
Excess tax benefits from equity incentive plan	3		3
Common stock repurchased (in shares)		(2,107,576)
Common stock repurchased	(15,986)	(21)	(15,965)
Issuance of common stock in connection with equity incentive plan			53		(53)
Tender offer to purchase outstanding options	(2,717)		(2,717)
Cash dividends declared ($0.23 per share in 2013 and $0.28 per share in 2012)	(4,706)					(4,706)
ENDING BALANCE at Sep. 30, 2013	$ 156,899	$ 207	$ 126,263	$ (8,141)	$ (222)	$ 42,604	$ (3,812)
ENDING BALANCE (in shares) at Sep. 30, 2013		20,736,146