Loans and Allowance for Loan Losses (Details of Loans Sold and Serviced) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan volume sold	$ 77,820	$ 49,174	$ 63,314
Gain on sale of loans	1,835	983	1,617
Loans serviced	155,397	137,723	138,184
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans serviced	147,354	122,697	116,627
SBA loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans serviced	3,903	6,578	8,557
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans serviced	$ 4,140	$ 8,448	$ 13,000