Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Composition of nonaccrual loans by class
Financing receivable recorded investment 90 days past due and nonaccrual	$ 7,690	$ 7,862
Commercial [Member]
Composition of nonaccrual loans by class
Financing receivable recorded investment 90 days past due and nonaccrual	172	329
Real estate-commercial [Member]
Composition of nonaccrual loans by class
Financing receivable recorded investment 90 days past due and nonaccrual	2,385	2,742
Other real estate construction [Member]
Composition of nonaccrual loans by class
Financing receivable recorded investment 90 days past due and nonaccrual	2,430	2,084
Real estate 1-4 family construction [Member]
Composition of nonaccrual loans by class
Financing receivable recorded investment 90 days past due and nonaccrual
Real estate-residential [Member]
Composition of nonaccrual loans by class
Financing receivable recorded investment 90 days past due and nonaccrual	2,358	2,441
Home equity [Member]
Composition of nonaccrual loans by class
Financing receivable recorded investment 90 days past due and nonaccrual	247	255
Consumer loans [Member]
Composition of nonaccrual loans by class
Financing receivable recorded investment 90 days past due and nonaccrual	98	11
Other loans [Member]
Composition of nonaccrual loans by class
Financing receivable recorded investment 90 days past due and nonaccrual