Loans and Allowance for Loan Losses (Details 5) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Recorded investment in nonaccrual and loans past due over 90 days still on accrual by class of loans
Nonaccrual	$ 7,021	$ 17,097
Loans Past Due Over 90 Days Still Accruing	0	488
Commercial [Member]
Recorded investment in nonaccrual and loans past due over 90 days still on accrual by class of loans
Nonaccrual	1,828	2,837
Loans Past Due Over 90 Days Still Accruing	0	449
Commercial real estate [Member]
Recorded investment in nonaccrual and loans past due over 90 days still on accrual by class of loans
Nonaccrual	4,551	13,918
Loans Past Due Over 90 Days Still Accruing	0	0
Residential real estate [Member]
Recorded investment in nonaccrual and loans past due over 90 days still on accrual by class of loans
Nonaccrual	637	241
Loans Past Due Over 90 Days Still Accruing	0	0
Home Equity [Member]
Recorded investment in nonaccrual and loans past due over 90 days still on accrual by class of loans
Nonaccrual	0	88
Loans Past Due Over 90 Days Still Accruing	0	39
Installment Loans [Member]
Recorded investment in nonaccrual and loans past due over 90 days still on accrual by class of loans
Nonaccrual	5	13
Loans Past Due Over 90 Days Still Accruing	$ 0	$ 0