Loans and Allowance for Loan Losses (Details 7) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2013 Contract	Jun. 30, 2012 Contract	Jun. 30, 2013 Contract	Jun. 30, 2012 Contract
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	6	6	9	13
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	$ 5,866,000	$ 857,000	$ 8,158,000	$ 6,877,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	5,866,000	857,000	8,158,000	6,873,000
Commercial and industrial [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	1	3	1	6
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	60,000	190,000	60,000	773,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	60,000	190,000	60,000	770,000
Vacant land, land development and residential construction [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	2	0	2	0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	3,247,000	0	3,247,000	0
Financing Receivable Modification, Post-Modification Recorded Principal Balance	3,247,000	0	3,247,000	0
Real estate - owner occupied [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	2	2	3	5
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	680,000	567,000	904,000	1,613,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	680,000	567,000	904,000	1,612,000
Real estate - non-owner occupied [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	0	2	1
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	0	0	2,068,000	4,391,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	0	0	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	1	0	1
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	0	100,000	0	100,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	0	100,000	0	100,000
Total commercial [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	5	6	8	13
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	3,987,000	857,000	6,279,000	6,877,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	3,987,000	857,000	6,279,000	6,873,000
Home equity and other [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	0	0	0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	0	0	0	0
Financing Receivable Modification, Post-Modification Recorded Principal Balance	0	0	0	0
1 - 4 family mortgages [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	1	0	1	0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	1,879,000	0	1,879,000	0
Financing Receivable Modification, Post-Modification Recorded Principal Balance	1,879,000	0	1,879,000	0
Total retail [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	1	0	1	0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	1,879,000	0	1,879,000	0
Financing Receivable Modification, Post-Modification Recorded Principal Balance	$ 1,879,000	$ 0	$ 1,879,000	$ 0

Loans and Allowance for Loan Losses (Details 7) (USD $)

3 Months Ended

6 Months Ended

Jun. 30, 2013

Contract

Jun. 30, 2012

Contract

Jun. 30, 2013

Contract

Jun. 30, 2012

Contract

Loans modified as troubled debt restructurings