Investments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Amortized cost and fair values of investment securities held-to-maturity
Amortized Cost	$ 55,208	$ 35,370
Unrealized Gain	458	988
Unrealized Loss	(2,783)	(140)
Fair Value	52,883	36,218
Municipal securities
Amortized cost and fair values of investment securities held-to-maturity
Amortized Cost	55,208	35,370
Unrealized Gain	458	988
Unrealized Loss	(2,783)	(140)
Fair Value	$ 52,883	$ 36,218