Fair Value (Details 4) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Carrying Amounts
Assets:
Cash and cash equivalents	$ 46,361	$ 72,872
Securities available-for-sale	389,820	380,455
Loans (including loans held-for-sale), net	780,974	745,057
FHLB and FRB stock	10,897	9,925
Accrued interest receivable	3,877	3,719
Loan servicing rights and I/O strips receivables	2,920	2,886
Liabilities:
Time deposits	295,172	288,528
Other deposits	807,581	760,900
Subordinated debt	23,702	23,702
Accrued interest payable	768	784
Estimated Fair Value
Assets:
Cash and cash equivalents	46,361	72,872
Securities available-for-sale	389,820	380,455
Loans (including loans held-for-sale), net	780,627	745,421
Accrued interest receivable	3,877	3,719
Loan servicing rights and I/O strips receivables	5,228	5,261
Liabilities:
Time deposits	296,090	289,512
Other deposits	807,581	760,900
Subordinated debt	19,310	15,950
Accrued interest payable	768	784
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	46,361
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Assets:
Securities available-for-sale	389,820
Loans (including loans held-for-sale), net	2,891
Accrued interest receivable	3,877
Loan servicing rights and I/O strips receivables	5,228
Liabilities:
Time deposits	296,090
Other deposits	807,581
Accrued interest payable	768
Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Assets:
Loans (including loans held-for-sale), net	777,736
Liabilities:
Subordinated debt	$ 19,310