Loans and Allowance for Loan Losses (Details 7) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012 Contract	Jun. 30, 2012 Contract
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	6	13
Financing Receivable Modification, Pre-Modification Recorded Investment	$ 857,000	$ 6,877,000
Financing Receivable Modification, Post-Modification Recorded Investment	857,000	6,873,000
Total commercial [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	6	13
Financing Receivable Modification, Pre-Modification Recorded Investment	857,000	6,877,000
Financing Receivable Modification, Post-Modification Recorded Investment	857,000	6,873,000
Total commercial [Member] | Commercial and industrial [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	3	6
Financing Receivable Modification, Pre-Modification Recorded Investment	190,000	773,000
Financing Receivable Modification, Post-Modification Recorded Investment	190,000	770,000
Total commercial [Member] | 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 Investment	0	0
Financing Receivable Modification, Post-Modification Recorded Investment	0	0
Total commercial [Member] | Real estate - owner occupied [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	2	5
Financing Receivable Modification, Pre-Modification Recorded Investment	567,000	1,613,000
Financing Receivable Modification, Post-Modification Recorded Investment	567,000	1,612,000
Total commercial [Member] | Real estate-non-owner occupied [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	1
Financing Receivable Modification, Pre-Modification Recorded Investment	0	4,391,000
Financing Receivable Modification, Post-Modification Recorded Investment	0	4,391,000
Total commercial [Member] | Real estate - multi-family and residential rental [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	1	1
Financing Receivable Modification, Pre-Modification Recorded Investment	100,000	100,000
Financing Receivable Modification, Post-Modification Recorded Investment	100,000	100,000
Total retail [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	0
Financing Receivable Modification, Pre-Modification Recorded Investment	0	0
Financing Receivable Modification, Post-Modification Recorded Investment	0	0
Total retail [Member] | 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 Investment	0	0
Financing Receivable Modification, Post-Modification Recorded Investment	0	0
Total retail [Member] | 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 Investment	0	0
Financing Receivable Modification, Post-Modification Recorded Investment	$ 0	$ 0