Fair Value Measurements, By Balance Sheet Grouping (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Financial Assets [Abstract]
Cash and due from banks	$ 10,710
Available-for-sale securities	322,039	318,823
Net loans	543,094
Bank owned life insurance	14,047
Regulatory stock	4,060
Accrued interest receivable	3,961
Financial Liabilities [Abstract]
Deposits	735,251
Borrowed funds	45,040
Trust preferred interest rate swap	251
Accrued interest payable	1,213
Consideration period for recognition of cash and due from banks	90 days
Consideration period for recognition of accrued interest receivable and payable	90 days
Carrying Amount [Member]
Financial Assets [Abstract]
Cash and due from banks	10,710	30,432
Available-for-sale securities	322,039	318,823
Net loans	492,492	481,022
Bank owned life insurance	14,047	13,669
Regulatory stock	4,060	3,301
Accrued interest receivable	3,961	3,621
Financial Liabilities [Abstract]
Deposits	729,207	733,993
Borrowed funds	47,956	53,882
Trust preferred interest rate swap	251	348
Accrued interest payable	1,213	1,512
Fair Value [Member]
Financial Assets [Abstract]
Cash and due from banks	10,710	30,432
Available-for-sale securities	322,039	318,823
Net loans	543,094	527,724
Bank owned life insurance	14,047	13,669
Regulatory stock	4,060	3,301
Accrued interest receivable	3,961	3,621
Financial Liabilities [Abstract]
Deposits	735,251	740,839
Borrowed funds	45,040	51,437
Trust preferred interest rate swap	251	348
Accrued interest payable	1,213	1,512
Level I [Member]
Financial Assets [Abstract]
Cash and due from banks	10,710
Available-for-sale securities	1,373
Net loans	0
Bank owned life insurance	14,047
Regulatory stock	4,060
Accrued interest receivable	3,961
Financial Liabilities [Abstract]
Deposits	443,101
Borrowed funds	0
Trust preferred interest rate swap	0
Accrued interest payable	1,213
Level II [Member]
Financial Assets [Abstract]
Cash and due from banks	0
Available-for-sale securities	320,666
Net loans	0
Bank owned life insurance	0
Regulatory stock	0
Accrued interest receivable	0
Financial Liabilities [Abstract]
Deposits	0
Borrowed funds	45,040
Trust preferred interest rate swap	251
Accrued interest payable	0
Level III [Member]
Financial Assets [Abstract]
Cash and due from banks	0
Available-for-sale securities	0
Net loans	543,094
Bank owned life insurance	0
Regulatory stock	0
Accrued interest receivable	0
Financial Liabilities [Abstract]
Deposits	292,150
Borrowed funds	0
Trust preferred interest rate swap	0
Accrued interest payable	$ 0