Loans and Allowance for Loan Losses (Details 2) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Recorded principal balance of nonaccrual loans, including troubled debt restructurings
Nonaccrual loans	$ 28,524,000	$ 45,074,000
Commercial and industrial [Member]
Recorded principal balance of nonaccrual loans, including troubled debt restructurings
Nonaccrual loans	4,371,000	5,916,000
Vacant land, land development and residential construction [Member]
Recorded principal balance of nonaccrual loans, including troubled debt restructurings
Nonaccrual loans	3,195,000	3,448,000
Real Estate - Owner Occupied [Member]
Recorded principal balance of nonaccrual loans, including troubled debt restructurings
Nonaccrual loans	3,371,000	6,635,000
Real Estate - Non-Owner Occupied [Member]
Recorded principal balance of nonaccrual loans, including troubled debt restructurings
Nonaccrual loans	13,144,000	24,169,000
Real Estate - Multi-Family and Residential Rental [Member]
Recorded principal balance of nonaccrual loans, including troubled debt restructurings
Nonaccrual loans	2,048,000	2,532,000
Total commercial [Member]
Recorded principal balance of nonaccrual loans, including troubled debt restructurings
Nonaccrual loans	26,129,000	42,700,000
Retail Home Equity and Other [Member]
Recorded principal balance of nonaccrual loans, including troubled debt restructurings
Nonaccrual loans	894,000	1,013,000
Retail 1-4 Family Mortgages [Member]
Recorded principal balance of nonaccrual loans, including troubled debt restructurings
Nonaccrual loans	1,501,000	1,361,000
Total retail [Member]
Recorded principal balance of nonaccrual loans, including troubled debt restructurings
Nonaccrual loans	$ 2,395,000	$ 2,374,000