Loans and Allowance - Subsequent Default (Details) (Nonimpaired Loans, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 loan	Sep. 30, 2012 loan	Sep. 30, 2013 loan	Sep. 30, 2012 loan
Financing Receivable, Impaired [Line Items]
Number of Loans		11		15
Recorded Balance		$ 1,809		$ 3,932
Commercial and industrial loans
Financing Receivable, Impaired [Line Items]
Number of Loans	1	3	1	3
Recorded Balance	18	1,415	18	1,415
Real estate loans - Commercial and farm land
Financing Receivable, Impaired [Line Items]
Number of Loans		1	1	1
Recorded Balance		23	223	23
Real estate loans - Residential
Financing Receivable, Impaired [Line Items]
Number of Loans	2	7	2	11
Recorded Balance	166	371	166	2,494
Real estate loans - Home equity
Financing Receivable, Impaired [Line Items]
Number of Loans	3		4
Recorded Balance	$ 184		$ 407