Loans and Allowance for Loan Losses (Details 8) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Contract	Sep. 30, 2011 Contract	Sep. 30, 2012 Contract	Sep. 30, 2011 Contract
Loans, modified as troubled debt restructurings within the previous twelve months, that became over 30 days past due
Number of Contracts	0	4	0	5
Recorded Principal Balance	$ 0	$ 1,049,000	$ 0	$ 1,208,000
Total commercial [Member]
Loans, modified as troubled debt restructurings within the previous twelve months, that became over 30 days past due
Number of Contracts	0	4	0	5
Recorded Principal Balance	0	1,049,000	0	1,208,000
Total commercial [Member] | Commercial and industrial [Member]
Loans, modified as troubled debt restructurings within the previous twelve months, that became over 30 days past due
Number of Contracts	0	1	0	2
Recorded Principal Balance	0	121,000	0	280,000
Total commercial [Member] | Vacant land, land development and residential construction [Member]
Loans, modified as troubled debt restructurings within the previous twelve months, that became over 30 days past due
Number of Contracts	0	0	0	0
Recorded Principal Balance	0	0	0	0
Total commercial [Member] | Real estate - owner occupied [Member]
Loans, modified as troubled debt restructurings within the previous twelve months, that became over 30 days past due
Number of Contracts	0	0	0	0
Recorded Principal Balance	0	0	0	0
Total commercial [Member] | Real estate - non-owner occupied [Member]
Loans, modified as troubled debt restructurings within the previous twelve months, that became over 30 days past due
Number of Contracts	0	1	0	1
Recorded Principal Balance	0	793,000	0	793,000
Total commercial [Member] | Real estate - multi-family and residential rental [Member]
Loans, modified as troubled debt restructurings within the previous twelve months, that became over 30 days past due
Number of Contracts	0	2	0	2
Recorded Principal Balance	0	135,000	0	135,000
Total retail [Member]
Loans, modified as troubled debt restructurings within the previous twelve months, that became over 30 days past due
Number of Contracts	0	0	0	0
Recorded Principal Balance	0	0	0	0
Total retail [Member] | Home equity and other [Member]
Loans, modified as troubled debt restructurings within the previous twelve months, that became over 30 days past due
Number of Contracts	0	0	0	0
Recorded Principal Balance	0	0	0	0
Total retail [Member] | 1 - 4 family mortgages [Member]
Loans, modified as troubled debt restructurings within the previous twelve months, that became over 30 days past due
Number of Contracts	0	0	0	0
Recorded Principal Balance	$ 0	$ 0	$ 0	$ 0