Fair Values of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Financial assets:
Cash, due from banks and federal funds sold	$ 72,241	$ 50,949	$ 108,671	$ 98,758
Interest bearing deposits with financial institutions	34,056	48,257
FHL BC and FRB stock	11,800	14,050
Bank-owned life insurance	53,841	52,595
Financial liabilities:
Noninterest bearing deposits	381,111	361,963
Junior subordinated debentures	58,378	58,378
Level 1
Financial assets:
Cash, due from banks and federal funds sold	38,185	2,692
Interest bearing deposits with financial institutions	34,056	48,257
Securities available-for-sale	1,511	1,524
Financial liabilities:
Noninterest bearing deposits	381,111	361,963
Junior subordinated debentures	21,258	13,172
Borrowing interest payable	6,189	4,006
Level 2
Financial assets:
Securities available-for-sale	401,154	295,928
FHL BC and FRB stock	11,800
Bank-owned life insurance	53,841	52,595
Loans held-for-sale	5,032	12,806
Accrued interest receivable	5,401	5,708
Financial liabilities:
Interest bearing deposits	1,319,416	1,382,663
Securities sold under repurchase agreements	1,738	901
Junior subordinated debentures	14,577	9,031
Subordinated debenture	26,629	24,532
Notes payable and other borrowings	322	260
Borrowing interest payable	4,286	2,809
Deposit interest payable	1,002	1,718
Level 3
Financial assets:
Securities available-for-sale	9,681	10,112
FHL BC and FRB stock		14,050
Loans, net	1,199,028	1,352,335
Carrying Amount
Financial assets:
Cash, due from banks and federal funds sold	38,185	2,692
Interest bearing deposits with financial institutions	34,056	48,257
Securities available-for-sale	412,346	307,564
FHL BC and FRB stock	11,800	14,050
Bank-owned life insurance	53,841	52,595
Loans held-for-sale	5,032	12,806
Loans, net	1,168,032	1,316,988
Accrued interest receivable	5,401	5,708
Financial liabilities:
Noninterest bearing deposits	381,111	361,963
Interest bearing deposits	1,315,823	1,378,818
Securities sold under repurchase agreements	1,738	901
Junior subordinated debentures	58,378	58,378
Subordinated debenture	45,000	45,000
Notes payable and other borrowings	500	500
Borrowing interest payable	10,475	6,815
Deposit interest payable	1,002	1,718
Fair Value
Financial assets:
Cash, due from banks and federal funds sold	38,185	2,692
Interest bearing deposits with financial institutions	34,056	48,257
Securities available-for-sale	412,346	307,564
FHL BC and FRB stock	11,800	14,050
Bank-owned life insurance	53,841	52,595
Loans held-for-sale	5,032	12,806
Loans, net	1,199,028	1,352,335
Accrued interest receivable	5,401	5,708
Financial liabilities:
Noninterest bearing deposits	381,111	361,963
Interest bearing deposits	1,319,416	1,382,663
Securities sold under repurchase agreements	1,738	901
Junior subordinated debentures	35,835	22,203
Subordinated debenture	26,629	24,532
Notes payable and other borrowings	322	260
Borrowing interest payable	10,475	6,815
Deposit interest payable	$ 1,002	$ 1,718