Fair Value Measurement (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financial Assets:
Securities available for sale	$ 210,344	$ 204,633
Significant Other Unobservable Inputs Level 3 [Member]
Financial Assets:
Securities available for sale	476	517
Carrying Amount [Member]
Financial Assets:
Cash and due from financial institutions	38,861	52,127
Securities available for sale	200,733	196,357
Other securities	15,573	15,388
Loans, available for sale	749	598
Loans, net of allowance for loan losses	781,183	764,011
Bank owned life insurance	18,439	17,963
Accrued interest receivable	4,709	3,787
Financial Liabilities:
Deposits		901,246
Nonmaturing deposits	644,430
Time deposits	270,807
Federal Home Loan Bank advances	40,270	50,295
Securities sold under agreement to repurchase	20,525	19,029
Subordinated debentures	29,427	29,427
Accrued interest payable	232	258
Total Fair Value [Member]
Financial Assets:
Cash and due from financial institutions	38,861	52,127
Securities available for sale	210,344	204,633
Other securities	15,573	15,388
Loans, available for sale	749	598
Loans, net of allowance for loan losses	796,918	785,900
Bank owned life insurance	18,439	17,963
Accrued interest receivable	4,709	3,787
Financial Liabilities:
Deposits		911,945
Nonmaturing deposits	644,430
Time deposits	273,037
Federal Home Loan Bank advances	41,816	52,263
Securities sold under agreement to repurchase	20,525	19,029
Subordinated debentures	27,360	26,461
Accrued interest payable	232	258
Total Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Financial Assets:
Cash and due from financial institutions	38,861
Other securities	15,573
Loans, available for sale	749
Bank owned life insurance	18,439
Accrued interest receivable	4,709
Financial Liabilities:
Nonmaturing deposits	644,430
Securities sold under agreement to repurchase	20,525
Accrued interest payable	232
Total Fair Value [Member] | Significant Other Observable Inputs Level 2 [Member]
Financial Assets:
Securities available for sale	209,868
Total Fair Value [Member] | Significant Other Unobservable Inputs Level 3 [Member]
Financial Assets:
Securities available for sale	476
Loans, net of allowance for loan losses	796,918
Financial Liabilities:
Time deposits	273,037
Federal Home Loan Bank advances	41,816
Subordinated debentures	$ 27,360