Loans, Impaired Financing Receivable Loan Type (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Dec. 31, 2014
Summary of certain impaired loan information [Abstract]
Non-accrual loans	[1]	$ 5,810	$ 6,081
Accruing loans past due 90 days or more		531	348
TDR loans		8,491	14,340
Increase in accruing loans past due 90 days or more creased		20
Average 90 days or more past due loan balance		70	70
Agricultural [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	[1]	0	0
Accruing loans past due 90 days or more		0	0
TDR loans		1,611	1,942
Commercial and financial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	[1]	1,717	1,343
Accruing loans past due 90 days or more		0	0
TDR loans		647	1,366
Real Estate: Construction, 1 to 4 family residential [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	[1]	173	0
Accruing loans past due 90 days or more		42	0
TDR loans		468	431
Real Estate: Construction, land development and commercial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	[1]	0	127
Accruing loans past due 90 days or more		79	0
TDR loans		469	0
Real Estate: Mortgage, farmland [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	[1]	0	0
Accruing loans past due 90 days or more		0	0
TDR loans		2,298	2,220
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	[1]	2,349	1,912
Accruing loans past due 90 days or more		305	348
TDR loans		1,318	1,199
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	[1]	155	369
Accruing loans past due 90 days or more		105	0
TDR loans		27	0
Real Estate: Mortgage, multi-family [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	[1]	242	55
Accruing loans past due 90 days or more		0	0
TDR loans		0	5,470
Real Estate: Mortgage, commercial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	[1]	1,174	2,275
Accruing loans past due 90 days or more		0	0
TDR loans		1,653	1,712
Loans to individuals [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	[1]	0	0
Accruing loans past due 90 days or more		0	0
TDR loans		0	0
Troubled Debt Restructuring [Member]
Summary of certain impaired loan information [Abstract]
TDR Loans included within nonaccrual loans		$ 2,720	$ 2,140

[1] There were $2.72 million and $2.14 million of TDR loans included within nonaccrual loans as of September 30, 2015 and December 31, 2014, respectively.