Loans and Allowance for Loan Losses (Details 8) (USD $)	12 Months Ended
Dec. 31, 2012 Contract	Dec. 31, 2011 Contract
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	29	90
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	$ 32,089,000	$ 30,300,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	32,084,000	29,623,000
Commercial and industrial [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	8	26
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	1,357,000	4,942,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	1,353,000	4,936,000
Vacant land, land development and residential construction [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	13
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	0	5,543,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	0	5,542,000
Real estate - owner occupied [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	6	11
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	1,745,000	6,727,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	1,744,000	6,220,000
Real estate - non-owner occupied [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	15	16
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	28,987,000	8,921,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	28,987,000	8,918,000
Real estate - multi-family and residential rental [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	23
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	0	4,002,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	0	3,842,000
Total commercial [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	29	89
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	32,089,000	30,135,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	32,084,000	29,458,000
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		1
Financing Receivable Modification, Pre-Modification Recorded Principal Balance		165,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance		165,000
Total retail [Member]
Loans modified as troubled debt restructurings
Financing Receivable Modification, Number of Contracts	0	1
Financing Receivable Modification, Pre-Modification Recorded Principal Balance	0	165,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance	$ 0	$ 165,000

Loans and Allowance for Loan Losses (Details 8) (USD $)

12 Months Ended

Dec. 31, 2012

Contract

Dec. 31, 2011

Contract

Loans modified as troubled debt restructurings

Financing Receivable Modification, Number of Contracts

Financing Receivable Modification, Pre-Modification Recorded Principal Balance

$ 32,089,000

$ 30,300,000

Financing Receivable Modification, Post-Modification Recorded Principal Balance