Loans and Allowance - Subsequent Default (Details) (Nonimpaired Loans, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013 Loan	Jun. 30, 2012 Loan	Jun. 30, 2013 Loan	Jun. 30, 2012 Loan
Financing Receivable, Impaired [Line Items]
Number of Loans	1	7	2	9
Recorded Balance	$ 3	$ 2,728	$ 226	$ 3,532
Commercial and industrial loans
Financing Receivable, Impaired [Line Items]
Number of Loans	1		1	1
Recorded Balance	3		3	46
Real estate loans - Commercial and farm land
Financing Receivable, Impaired [Line Items]
Number of Loans		2	1	3
Recorded Balance		445	223	1,203
Real estate loans - Residential
Financing Receivable, Impaired [Line Items]
Number of Loans		5		5
Recorded Balance		$ 2,283		$ 2,283