Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Investment securities available for sale:
Total securities available for sale	$ 202,142	$ 256,089	$ 301,160
Fair Value Measurement Using: Level 1
Investment securities available for sale:
Total securities available for sale			85
Fair Value Measurement Using: Level 2
Investment securities available for sale:
Total securities available for sale	202,142	256,089	300,091
Fair Value Measurement Using: Level 3
Investment securities available for sale:
Total securities available for sale			984
Recurring basis | Fair Value Measurement Using: Level 1
Investment securities available for sale:
Total securities available for sale			85
Recurring basis | Fair Value Measurement Using: Level 1 | U.S. Treasury
Investment securities available for sale:
Total securities available for sale			85
Recurring basis | Fair Value Measurement Using: Level 2
Investment securities available for sale:
Total securities available for sale	202,142		300,091
Recurring basis | Fair Value Measurement Using: Level 2 | Municipal bonds
Investment securities available for sale:
Total securities available for sale	77,324		155,939
Recurring basis | Fair Value Measurement Using: Level 2 | Mortgage-backed securities
Investment securities available for sale:
Total securities available for sale	124,818		144,152
Recurring basis | Fair Value Measurement Using: Level 3
Investment securities available for sale:
Total securities available for sale			984
Recurring basis | Fair Value Measurement Using: Level 3 | Mortgage-backed securities
Investment securities available for sale:
Total securities available for sale			984
Recurring basis | Securities at Fair Value
Investment securities available for sale:
Total securities available for sale	202,142		301,160
Recurring basis | Securities at Fair Value | U.S. Treasury
Investment securities available for sale:
Total securities available for sale			85
Recurring basis | Securities at Fair Value | Municipal bonds
Investment securities available for sale:
Total securities available for sale	77,324		155,939
Recurring basis | Securities at Fair Value | Mortgage-backed securities
Investment securities available for sale:
Total securities available for sale	$ 124,818		$ 145,136