Loans - Schedule of Troubled Debt Restructurings, Payment Default in Past 12 Months (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 notes	Dec. 31, 2012 notes	Dec. 31, 2011 notes
Schedule of Financing Receivable, Troubled Debt Restructurings Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	3	20
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 135	$ 1,103	$ 4,322
Commercial real estate
Schedule of Financing Receivable, Troubled Debt Restructurings Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	0	9
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	135	0	2,747
Land acquisition & development construction real estate
Schedule of Financing Receivable, Troubled Debt Restructurings Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	468	1,135
Residential construction real estate
Schedule of Financing Receivable, Troubled Debt Restructurings Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	170
Total construction loans
Schedule of Financing Receivable, Troubled Debt Restructurings Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	468	1,305
Residential real estate
Schedule of Financing Receivable, Troubled Debt Restructurings Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	635	0
Agricultural real estate
Schedule of Financing Receivable, Troubled Debt Restructurings Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	33
Total real estate loans
Schedule of Financing Receivable, Troubled Debt Restructurings Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	3	12
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	135	1,103	4,085
Commercial
Schedule of Financing Receivable, Troubled Debt Restructurings Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	6
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	213
Agricultural
Schedule of Financing Receivable, Troubled Debt Restructurings Payment Default
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0	$ 24