Allowance for Loan Losses (Details 3) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Aging of recorded investment in loans by past due category and class of loans
Fair value	$ 9,435		$ 10,082
Financing Receivable, Modifications, Recorded Investment	4,847	$ 6,819	7,034	$ 7,424	$ 7,984	$ 8,565
Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
Fair value	140		347
Farmland
Aging of recorded investment in loans by past due category and class of loans
Fair value	0		2,767
Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
Fair value	0		0
Agriculture
Aging of recorded investment in loans by past due category and class of loans
Fair value	0		0
All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
Fair value	0		0
First Liens
Aging of recorded investment in loans by past due category and class of loans
Fair value	0		436
Home Equity
Aging of recorded investment in loans by past due category and class of loans
Fair value	0		0
Junior Liens
Aging of recorded investment in loans by past due category and class of loans
Fair value	0		0
Multifamily
Aging of recorded investment in loans by past due category and class of loans
Fair value	0		0
All Other Residential
Aging of recorded investment in loans by past due category and class of loans
Fair value	0		0
Motor Vehicle
Aging of recorded investment in loans by past due category and class of loans
Fair value	0		0
All Other Consumer
Aging of recorded investment in loans by past due category and class of loans
Fair value	0		0
Nonperforming Financing Receivable [Member]
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	1,393		1,484
Nonaccrual	10,035		13,245
Financing Receivable, Modifications, Recorded Investment	3,590		3,349
Financing Receivable, Modifications, Nonaccrual	1,241		3,754
Nonperforming Financing Receivable [Member] | Commercial & Industrial
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	41		41
Nonaccrual	1,096		1,679
Financing Receivable, Modifications, Recorded Investment	1		2
Financing Receivable, Modifications, Nonaccrual	202		212
Nonperforming Financing Receivable [Member] | Farmland
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0		19
Nonaccrual	3,258		4,141
Financing Receivable, Modifications, Recorded Investment	0		0
Financing Receivable, Modifications, Nonaccrual	0		0
Nonperforming Financing Receivable [Member] | Non Farm, Non Residential
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0		0
Nonaccrual	88		172
Financing Receivable, Modifications, Recorded Investment	0		56
Financing Receivable, Modifications, Nonaccrual	0		2,440
Nonperforming Financing Receivable [Member] | Agriculture
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0		0
Nonaccrual	27		707
Financing Receivable, Modifications, Recorded Investment	0		0
Financing Receivable, Modifications, Nonaccrual	0		0
Nonperforming Financing Receivable [Member] | All Other Commercial
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0		0
Nonaccrual	1,147		1,236
Financing Receivable, Modifications, Recorded Investment	0		0
Financing Receivable, Modifications, Nonaccrual	0		0
Nonperforming Financing Receivable [Member] | First Liens
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	1,063		1,011
Nonaccrual	3,518		3,972
Financing Receivable, Modifications, Recorded Investment	3,343		3,105
Financing Receivable, Modifications, Nonaccrual	564		575
Nonperforming Financing Receivable [Member] | Home Equity
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	12		8
Nonaccrual	75		249
Financing Receivable, Modifications, Recorded Investment	0		0
Financing Receivable, Modifications, Nonaccrual	0		0
Nonperforming Financing Receivable [Member] | Junior Liens
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	18		137
Nonaccrual	68		134
Financing Receivable, Modifications, Recorded Investment	57		0
Financing Receivable, Modifications, Nonaccrual	0		0
Nonperforming Financing Receivable [Member] | Multifamily
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0		0
Nonaccrual	0		0
Financing Receivable, Modifications, Recorded Investment	0		0
Financing Receivable, Modifications, Nonaccrual	0		0
Nonperforming Financing Receivable [Member] | All Other Residential
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0		0
Nonaccrual	66		90
Financing Receivable, Modifications, Recorded Investment	0		0
Financing Receivable, Modifications, Nonaccrual	0		0
Nonperforming Financing Receivable [Member] | Motor Vehicle
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	259		268
Nonaccrual	179		242
Financing Receivable, Modifications, Recorded Investment	2		9
Financing Receivable, Modifications, Nonaccrual	0		0
Nonperforming Financing Receivable [Member] | All Other Consumer
Aging of recorded investment in loans by past due category and class of loans
Loans Past Due Over 90 Day Still Accruing	0		0
Nonaccrual	513		623
Financing Receivable, Modifications, Recorded Investment	187		177
Financing Receivable, Modifications, Nonaccrual	$ 475		$ 527