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Commitments and Off-Balance Sheet Risk (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Summary of contractual amounts of financial instruments with off-balance sheet risk
Contractual amounts of financial instruments with off-balance sheet risk	$ 384,522,000	$ 334,768,000
Commercial unused lines of credit [Member]
Summary of contractual amounts of financial instruments with off-balance sheet risk
Contractual amounts of financial instruments with off-balance sheet risk	231,892,000	222,237,000
Unused lines of credit secured by 1 - 4 family residential properties [Member]
Summary of contractual amounts of financial instruments with off-balance sheet risk
Contractual amounts of financial instruments with off-balance sheet risk	23,490,000	24,250,000
Credit card unused lines of credit [Member]
Summary of contractual amounts of financial instruments with off-balance sheet risk
Contractual amounts of financial instruments with off-balance sheet risk	8,552,000	8,512,000
Other consumer unused lines of credit [Member]
Summary of contractual amounts of financial instruments with off-balance sheet risk
Contractual amounts of financial instruments with off-balance sheet risk	7,020,000	4,613,000
Commitments to extend credit [Member]
Summary of contractual amounts of financial instruments with off-balance sheet risk
Contractual amounts of financial instruments with off-balance sheet risk	100,018,000	64,565,000
Standby letters of credit [Member]
Summary of contractual amounts of financial instruments with off-balance sheet risk
Contractual amounts of financial instruments with off-balance sheet risk	$ 13,550,000	$ 10,591,000