Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financial Assets:
Cash and due from banks	$ 20,838	$ 31,020
Federal fund sold and overnight interest-bearing deposits	14,867	27,857
Mortgage servicing rights	2,873	2,549
Accrued interest receivable	5,100	5,190
Deposits:
Non-interest bearing demand	180,461	192,271
Savings, interest checking and money market	427,742	405,702
Accrued interest payable	1,316	909
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets:
Cash and due from banks	20,838	31,020
Federal fund sold and overnight interest-bearing deposits	14,867	27,857
Investment in available-for-sale securities	1,009	2,030
Accrued interest receivable	5,100	5,190
Assets, Total	41,814	66,097
Deposits:
Non-interest bearing demand	180,461	192,271
Savings, interest checking and money market	427,742	405,702
Federal funds purchased and securities sold under agreements to repurchase	21,499	21,058
Accrued interest payable	1,316	909
Liabilities, Fair Value Disclosure, Total	631,018	619,940
Other Observable Inputs (Level 2)
Financial Assets:
Investment in available-for-sale securities	219,646	198,216
Investment in FHLB stock	2,686	2,278
Cash surrender value - life insurance	2,175	2,136
Assets, Total	224,507	202,630
Deposits:
Subordinated notes	33,726	13,154
Federal Home Loan Bank advances	30,070	20,651
Liabilities, Fair Value Disclosure, Total	63,796	33,805
Net Significant Unobservable Inputs (Level 3)
Financial Assets:
Loans, net	832,932	834,824
Mortgage servicing rights	2,873	2,549
Assets, Total	835,805	837,373
Deposits:
Time deposits	380,808	397,986
Liabilities, Fair Value Disclosure, Total	380,808	397,986
Carrying amount
Financial Assets:
Cash and due from banks	20,838	31,020
Federal fund sold and overnight interest-bearing deposits	14,867	27,857
Investment in available-for-sale securities	220,655	200,246
Loans, net	823,632	832,142
Investment in FHLB stock	2,686	2,278
Mortgage servicing rights	2,873	2,549
Cash surrender value - life insurance	2,175	2,136
Accrued interest receivable	5,100	5,190
Assets, Total	1,092,826	1,103,418
Deposits:
Non-interest bearing demand	180,461	192,271
Savings, interest checking and money market	427,742	405,702
Time deposits	377,789	393,302
Federal funds purchased and securities sold under agreements to repurchase	21,499	21,058
Subordinated notes	49,486	49,486
Federal Home Loan Bank advances	29,033	20,126
Accrued interest payable	1,316	909
Liabilities, Fair Value Disclosure, Total	1,087,326	1,082,854
Fair value
Financial Assets:
Cash and due from banks	20,838	31,020
Federal fund sold and overnight interest-bearing deposits	14,867	27,857
Investment in available-for-sale securities	220,655	200,246
Loans, net	832,932	834,824
Investment in FHLB stock	2,686	2,278
Mortgage servicing rights	2,873	2,549
Cash surrender value - life insurance	2,175	2,136
Accrued interest receivable	5,100	5,190
Assets, Total	1,102,126	1,106,100
Deposits:
Non-interest bearing demand	180,461	192,271
Savings, interest checking and money market	427,742	405,702
Time deposits	380,808	397,986
Federal funds purchased and securities sold under agreements to repurchase	21,499	21,058
Subordinated notes	33,726	13,154
Federal Home Loan Bank advances	30,070	20,651
Accrued interest payable	1,316	909
Liabilities, Fair Value Disclosure, Total	$ 1,075,622	$ 1,051,731