Loans and Allowance - Summary of Troubled Debt Restructurings (Details) (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, Modifications [Line Items]
Pre-Modification Recorded Balance	$ 1,816	$ 2,382	$ 7,445	$ 7,202
Post-Modification Recorded Balance	1,843	2,584	6,459	6,988
Number of Loans	9	14	25	38
Commercial and industrial loans
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance	162	875	294	1,155
Post-Modification Recorded Balance	183	1,048	315	1,327
Number of Loans	1	3	5	6
Real estate loans - Construction
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance		303		794
Post-Modification Recorded Balance		303		653
Number of Loans		1		2
Real estate loans - Commercial and farm land
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance	1,464	875	6,449	2,967
Post-Modification Recorded Balance	1,469	875	5,450	2,828
Number of Loans	6	2	10	7
Real estate loans - Residential
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance	190	239	658	2,196
Post-Modification Recorded Balance	191	241	649	2,063
Number of Loans	2	4	8	19
Individuals' loans for household and other personal expenditures
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Balance		90	44	90
Post-Modification Recorded Balance		$ 117	$ 45	$ 117
Number of Loans		4	2	4