Loans and Allowance for Loan Losses - Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment, Total	$ 23,856		$ 23,856		$ 26,167
Unpaid Principal Balance, Total	33,069		33,069		34,156
Related Allowance, Total	1,547		1,547		1,673
Average Recorded Balance, Total	24,860	28,080	25,756	30,238
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	14,625		14,625		15,378
Unpaid Principal Balance	19,617		19,617		20,086
Related Allowance	0		0		0
Average Recorded Balance	16,127	7,204	16,667	9,246
Recorded Investment	5,523		5,523		7,942
Unpaid Principal Balance	8,842		8,842		9,876
Related Allowance	1,462		1,462		1,449
Average Recorded Balance	5,139	19,502	5,781	19,376
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	245		245		138
Unpaid Principal Balance	298		298		138
Related Allowance	0		0		0
Average Recorded Balance	203	164	167	269
Recorded Investment	343		343		459
Unpaid Principal Balance	343		343		459
Related Allowance	79		79		209
Average Recorded Balance	342	159	396	216
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	1,613		1,613		1,610
Unpaid Principal Balance	1,801		1,801		1,686
Related Allowance	0		0		0
Average Recorded Balance	1,802	966	1,800	1,052
Recorded Investment	57		57		181
Unpaid Principal Balance	154		154		1,452
Related Allowance	6		6		15
Average Recorded Balance	29	85	60	79
Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	1,107		1,107		398
Unpaid Principal Balance	1,518		1,518		398
Related Allowance	0		0		0
Average Recorded Balance	897	0	669	0
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Balance			0	0
Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	191		191		0
Unpaid Principal Balance	293		293		0
Related Allowance	0		0		0
Average Recorded Balance	208	0	129	0
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Balance	0	0	0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	152		152		61
Unpaid Principal Balance	203		203		61
Related Allowance	0		0		0
Average Recorded Balance	113	0	87	0
Recorded Investment	0		0		0
Unpaid Principal Balance	0		0		0
Related Allowance	0		0		0
Average Recorded Balance	$ 0	$ 0	$ 0	$ 0