Investment Securities (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 item	Dec. 31, 2012	Jun. 30, 2012
Investment securities available for sale:
Amortized Cost	$ 315,866,000	$ 315,866,000	$ 82,189,000	$ 144,165,000
Unrealized Gain	972,000	972,000	2,360,000	2,662,000
Unrealized Loss	(3,791,000)	(3,791,000)	(483,000)	(693,000)
Estimated Fair Value	313,047,000	313,047,000	84,066,000	146,134,000
Additional disclosures
Excess FHLB stock with the entity repurchased by FHLB through their stock repurchase program	1,900,000
Number of inverse putable reverse repurchase of the Bank's secured by collateral		3
Value of inverse putable reverse repurchases secured by collateral	28,500,000	28,500,000
Stock, Estimated Fair Value
FHLB stock	8,600,000	8,600,000
U.S. Treasury
Investment securities available for sale:
Amortized Cost	73,000	73,000	147,000	247,000
Unrealized Gain	10,000	10,000	12,000	14,000
Estimated Fair Value	83,000	83,000	159,000	261,000
Corporate
Investment securities available for sale:
Amortized Cost	9,169,000	9,169,000
Estimated Fair Value	9,169,000	9,169,000
Municipal bonds
Investment securities available for sale:
Amortized Cost	96,257,000	96,257,000	25,401,000	39,928,000
Unrealized Gain	226,000	226,000	1,186,000	1,259,000
Unrealized Loss	(1,736,000)	(1,736,000)	(1,000)	(71,000)
Estimated Fair Value	94,747,000	94,747,000	26,586,000	41,116,000
Mortgage-backed securities
Investment securities available for sale:
Amortized Cost	210,367,000	210,367,000	56,641,000	103,990,000
Unrealized Gain	736,000	736,000	1,162,000	1,389,000
Unrealized Loss	(2,055,000)	(2,055,000)	(482,000)	(622,000)
Estimated Fair Value	209,048,000	209,048,000	57,321,000	104,757,000
Additional disclosures
Estimated par value of securities pledged as collateral for the Bank's inverse putable reverse repurchases	34,800,000	34,800,000
Fair value of securities pledged as collateral for the Bank's inverse putable reverse repurchases	$ 36,000,000	$ 36,000,000