Fair Value Measurements, Balance Sheet Grouping (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Financial assets [Abstract]
Loans held for sale		$ 92,514,000
Level I [Member]
Financial assets [Abstract]
Cash and cash equivalents	54,415,000
Securities	0
Loans held for sale	0
Net portfolio loans	0
Bank-owned life insurance	0
Accrued interest receivable	0
Mortgage interest rate locks	0
Financial liabilities [Abstract]
Deposits	0
Securities sold under agreements to repurchase	0
Short-term debt	0
FHLB borrowings and other debt	0
Trust preferred capital notes	0
Accrued interest payable	0
Interest rate swap	0
Mortgage banking hedge instruments	0
Level II [Member]
Financial assets [Abstract]
Cash and cash equivalents	0
Securities	319,457,000
Loans held for sale	82,114,000
Net portfolio loans	1,178,000
Bank-owned life insurance	16,484,000
Accrued interest receivable	3,974,000
Mortgage interest rate locks	35,000
Financial liabilities [Abstract]
Deposits	984,682,000
Securities sold under agreements to repurchase	33,975,000
Short-term debt	11,873,000
FHLB borrowings and other debt	78,912,000
Trust preferred capital notes	5,221,000
Accrued interest payable	654,000
Interest rate swap	541,000
Mortgage banking hedge instruments	39,000
Level III [Member]
Financial assets [Abstract]
Cash and cash equivalents	0
Securities	0
Loans held for sale	0
Net portfolio loans	715,180,000
Bank-owned life insurance	0
Accrued interest receivable	0
Mortgage interest rate locks	0
Financial liabilities [Abstract]
Deposits	0
Securities sold under agreements to repurchase	0
Short-term debt	0
FHLB borrowings and other debt	0
Trust preferred capital notes	0
Accrued interest payable	0
Interest rate swap	0
Mortgage banking hedge instruments	0
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	54,415,000	51,270,000
Securities	319,457,000	308,242,000
Loans held for sale	82,114,000
Net portfolio loans	695,166,000	656,770,000
Bank-owned life insurance	16,484,000
Accrued interest receivable	3,974,000	4,221,000
Mortgage interest rate locks	35,000
Financial liabilities [Abstract]
Deposits	981,900,000	929,869,000
Securities sold under agreements to repurchase	33,975,000	31,686,000
Short-term debt	11,873,000	28,331,000
FHLB borrowings and other debt	72,912,000	82,912,000
Trust preferred capital notes	5,155,000	5,155,000
Accrued interest payable	654,000	844,000
Interest rate swap	541,000	314,000
Mortgage banking hedge instruments	39,000
Fair Value [Member]
Financial assets [Abstract]
Cash and cash equivalents	54,415,000	51,270,000
Securities	319,457,000	308,242,000
Loans held for sale	82,114,000
Net portfolio loans	716,358,000	678,245,000
Bank-owned life insurance	16,484,000
Accrued interest receivable	3,974,000	4,221,000
Mortgage interest rate locks	35,000
Financial liabilities [Abstract]
Deposits	984,682,000	934,322,000
Securities sold under agreements to repurchase	33,975,000	31,686,000
Short-term debt	11,873,000	28,331,000
FHLB borrowings and other debt	78,912,000	83,899,000
Trust preferred capital notes	5,221,000	5,216,000
Accrued interest payable	654,000	844,000
Interest rate swap		314,000
Mortgage banking hedge instruments	$ 39,000