Loans and Allowance for Loan Losses (Details 7) (USD $)	3 Months Ended
	Mar. 31, 2013 Contract	Mar. 31, 2012 Contract
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	3	7
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	$ 2,943,000	$ 6,020,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	2,943,000	6,016,000
Commercial and industrial [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	1	3
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	875,000	583,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	875,000	580,000
Vacant land, land development and residential construction [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	0	0
Financing Receivable Modification, Post-Modification Recorded Principal Balance	0	0
Real estate - owner occupied [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	3
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	0	1,046,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	0	1,045,000
Real estate - non-owner occupied [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	2	1
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	2,068,000	4,391,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	2,068,000	4,391,000
Real estate - multi-family and residential rental [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	0	0
Financing Receivable Modification, Post-Modification Recorded Principal Balance	0	0
Total commercial [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	3	7
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	2,943,000	6,020,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	2,943,000	6,016,000
Home equity and other [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	0	0
Financing Receivable Modification, Post-Modification Recorded Principal Balance	0	0
1 - 4 family mortgages [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	0	0
Financing Receivable Modification, Post-Modification Recorded Principal Balance	0	0
Total retail [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	0	0
Financing Receivable Modification, Post-Modification Recorded Principal Balance	$ 0	$ 0