Fair Value Measurements, Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Level I [Member]
Financial assets [Abstract]
Cash and cash equivalents	$ 50,450	$ 54,415
Securities	0	0
Loans held for sale	0	0
Net portfolio loans	0	0
Bank-owned life insurance	0	0
Accrued interest receivable	0	0
Mortgage interest rate locks	0	0
Interest rate swaps	0	0
Financial liabilities [Abstract]
Deposits	0	0
Securities sold under agreements	0	0
Short-term debt	0	0
FHLB borrowings	0	0
Trust preferred capital notes	0	0
Accrued interest payable	0	0
Interest rate swap	0	0
Mortgage banking hedge instruments	0	0
Level II [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Securities	331,650	319,457
Loans held for sale	48,721	82,114
Net portfolio loans	9,094	11,165
Bank-owned life insurance	16,604	16,484
Accrued interest receivable	4,107	3,974
Mortgage interest rate locks	69	35
Interest rate swaps	21	80
Financial liabilities [Abstract]
Deposits	969,470	984,682
Securities sold under agreements	31,880	33,975
Short-term debt	519	11,873
FHLB borrowings	85,840	78,912
Trust preferred capital notes	5,206	5,221
Accrued interest payable	617	654
Interest rate swap	423	541
Mortgage banking hedge instruments	81	39
Level III [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Securities	0	0
Loans held for sale	0	0
Net portfolio loans	711,310	705,193
Bank-owned life insurance	0	0
Accrued interest receivable	0	0
Mortgage interest rate locks	0	0
Interest rate swaps	0	0
Financial liabilities [Abstract]
Deposits	0	0
Securities sold under agreements	0	0
Short-term debt	0	0
FHLB borrowings	0	0
Trust preferred capital notes	0	0
Accrued interest payable	0	0
Interest rate swap	0	0
Mortgage banking hedge instruments	0	0
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	50,450	54,415
Securities	331,650	319,457
Loans held for sale	48,721	82,114
Net portfolio loans	701,078	695,166
Bank-owned life insurance	16,604	16,484
Accrued interest receivable	4,107	3,974
Mortgage interest rate locks	69	35
Interest rate swaps	21	80
Financial liabilities [Abstract]
Deposits	966,076	981,900
Securities sold under agreements	31,880	33,975
Short-term debt	519	11,873
FHLB borrowings	85,000	72,912
Trust preferred capital notes	5,155	5,155
Accrued interest payable	617	654
Interest rate swap	423	541
Mortgage banking hedge instruments	81	39
Fair Value [Member]
Financial assets [Abstract]
Cash and cash equivalents	50,450	54,415
Securities	331,650	319,457
Loans held for sale	48,721	82,114
Net portfolio loans	720,404	716,358
Bank-owned life insurance	16,604	16,484
Accrued interest receivable	4,107	3,974
Mortgage interest rate locks	69	35
Interest rate swaps	21	80
Financial liabilities [Abstract]
Deposits	969,470	984,682
Securities sold under agreements	31,880	33,975
Short-term debt	519	11,873
FHLB borrowings	85,840	78,912
Trust preferred capital notes	5,206	5,221
Accrued interest payable	617	654
Interest rate swap	423	541
Mortgage banking hedge instruments	$ 81	$ 39