Allowance for Loan Losses (Details 6) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	$ 1,949,587	$ 1,913,022
Financing Receivable, Recorded Investment, Past Due	14,888	21,305
Financing Receivable, Recorded Investment, Current	1,934,699	1,891,717
Total loans	1,938,932	1,903,609
Loans not rated	1,938,932
Commercial & Industrial
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	509,491	475,801
Financing Receivable, Recorded Investment, Past Due	1,733	1,092
Financing Receivable, Recorded Investment, Current	507,758	474,709
Total loans	507,837	474,500
Farmland
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	107,108	108,469
Financing Receivable, Recorded Investment, Past Due	3,206	4,012
Financing Receivable, Recorded Investment, Current	103,902	104,457
Total loans	105,062	106,596
Non Farm, Non Residential
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	188,750	200,945
Financing Receivable, Recorded Investment, Past Due	77	141
Financing Receivable, Recorded Investment, Current	188,673	200,804
Total loans	188,316	200,502
Agriculture
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	142,711	153,090
Financing Receivable, Recorded Investment, Past Due	11	702
Financing Receivable, Recorded Investment, Current	142,700	152,388
Total loans	140,220	150,936
All Other Commercial
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	210,237	207,875
Financing Receivable, Recorded Investment, Past Due	4	0
Financing Receivable, Recorded Investment, Current	210,233	207,875
Total loans	209,101	206,956
First Liens
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	239,159	255,247
Financing Receivable, Recorded Investment, Past Due	2,913	8,218
Financing Receivable, Recorded Investment, Current	236,246	247,029
Total loans	238,206	254,384
Home Equity
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	37,813	36,116
Financing Receivable, Recorded Investment, Past Due	364	364
Financing Receivable, Recorded Investment, Current	37,449	35,752
Total loans	37,745	36,036
Junior Liens
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	48,075	42,262
Financing Receivable, Recorded Investment, Past Due	209	574
Financing Receivable, Recorded Investment, Current	47,866	41,688
Total loans	47,962	42,155
Multifamily
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	107,179	90,141
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable, Recorded Investment, Current	107,179	90,141
Total loans	106,910	89,972
All Other Residential
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	12,481	13,641
Financing Receivable, Recorded Investment, Past Due	0	312
Financing Receivable, Recorded Investment, Current	12,481	13,329
Total loans	12,441	13,596
Motor Vehicle
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	319,384	303,972
Financing Receivable, Recorded Investment, Past Due	6,252	5,761
Financing Receivable, Recorded Investment, Current	313,132	298,211
Total loans	318,061	302,631
All Other Consumer
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	27,199	25,463
Financing Receivable, Recorded Investment, Past Due	119	129
Financing Receivable, Recorded Investment, Current	27,080	25,334
Total loans	27,071	25,345
Pass
Analysis of risk category of loans by class of loans
Total loans	1,191,393	1,140,885
Pass | Commercial & Industrial
Analysis of risk category of loans by class of loans
Total loans	462,286	430,015
Pass | Farmland
Analysis of risk category of loans by class of loans
Total loans	88,960	88,338
Pass | Non Farm, Non Residential
Analysis of risk category of loans by class of loans
Total loans	172,165	179,181
Pass | Agriculture
Analysis of risk category of loans by class of loans
Total loans	113,536	111,724
Pass | All Other Commercial
Analysis of risk category of loans by class of loans
Total loans	200,398	194,170
Pass | First Liens
Analysis of risk category of loans by class of loans
Total loans	44,443	45,320
Pass | Home Equity
Analysis of risk category of loans by class of loans
Total loans	673	319
Pass | Junior Liens
Analysis of risk category of loans by class of loans
Total loans	2,041	1,882
Pass | Multifamily
Analysis of risk category of loans by class of loans
Total loans	106,891	89,936
Pass | All Other Residential
Analysis of risk category of loans by class of loans
Total loans	0	0
Pass | Motor Vehicle
Analysis of risk category of loans by class of loans
Total loans	0	0
Pass | All Other Consumer
Analysis of risk category of loans by class of loans
Total loans	0	0
Special Mention
Analysis of risk category of loans by class of loans
Total loans	45,267	59,391
Special Mention | Commercial & Industrial
Analysis of risk category of loans by class of loans
Total loans	21,079	19,889
Special Mention | Farmland
Analysis of risk category of loans by class of loans
Total loans	7,655	10,782
Special Mention | Non Farm, Non Residential
Analysis of risk category of loans by class of loans
Total loans	5,620	7,689
Special Mention | Agriculture
Analysis of risk category of loans by class of loans
Total loans	9,823	17,482
Special Mention | All Other Commercial
Analysis of risk category of loans by class of loans
Total loans	43	2,723
Special Mention | First Liens
Analysis of risk category of loans by class of loans
Total loans	971	750
Special Mention | Home Equity
Analysis of risk category of loans by class of loans
Total loans	0	0
Special Mention | Junior Liens
Analysis of risk category of loans by class of loans
Total loans	76	76
Special Mention | Multifamily
Analysis of risk category of loans by class of loans
Total loans	0	0
Special Mention | All Other Residential
Analysis of risk category of loans by class of loans
Total loans	0	0
Special Mention | Motor Vehicle
Analysis of risk category of loans by class of loans
Total loans	0	0
Special Mention | All Other Consumer
Analysis of risk category of loans by class of loans
Total loans	0	0
Substandard
Analysis of risk category of loans by class of loans
Total loans	63,389	73,784
Substandard | Commercial & Industrial
Analysis of risk category of loans by class of loans
Total loans	16,145	18,611
Substandard | Farmland
Analysis of risk category of loans by class of loans
Total loans	8,427	7,466
Substandard | Non Farm, Non Residential
Analysis of risk category of loans by class of loans
Total loans	10,531	13,632
Substandard | Agriculture
Analysis of risk category of loans by class of loans
Total loans	16,405	21,388
Substandard | All Other Commercial
Analysis of risk category of loans by class of loans
Total loans	6,923	7,459
Substandard | First Liens
Analysis of risk category of loans by class of loans
Total loans	3,935	3,980
Substandard | Home Equity
Analysis of risk category of loans by class of loans
Total loans	120	64
Substandard | Junior Liens
Analysis of risk category of loans by class of loans
Total loans	171	342
Substandard | Multifamily
Analysis of risk category of loans by class of loans
Total loans	0	0
Substandard | All Other Residential
Analysis of risk category of loans by class of loans
Total loans	15	67
Substandard | Motor Vehicle
Analysis of risk category of loans by class of loans
Total loans	674	731
Substandard | All Other Consumer
Analysis of risk category of loans by class of loans
Total loans	43	44
Doubtful
Analysis of risk category of loans by class of loans
Total loans	76	143
Doubtful | Commercial & Industrial
Analysis of risk category of loans by class of loans
Total loans	0	38
Doubtful | Farmland
Analysis of risk category of loans by class of loans
Total loans	0	0
Doubtful | Non Farm, Non Residential
Analysis of risk category of loans by class of loans
Total loans	0	0
Doubtful | Agriculture
Analysis of risk category of loans by class of loans
Total loans	0	0
Doubtful | All Other Commercial
Analysis of risk category of loans by class of loans
Total loans	0	0
Doubtful | First Liens
Analysis of risk category of loans by class of loans
Total loans	0	5
Doubtful | Home Equity
Analysis of risk category of loans by class of loans
Total loans	0	0
Doubtful | Junior Liens
Analysis of risk category of loans by class of loans
Total loans	76	100
Doubtful | Multifamily
Analysis of risk category of loans by class of loans
Total loans	0	0
Doubtful | All Other Residential
Analysis of risk category of loans by class of loans
Total loans	0	0
Doubtful | Motor Vehicle
Analysis of risk category of loans by class of loans
Total loans	0	0
Doubtful | All Other Consumer
Analysis of risk category of loans by class of loans
Total loans	0	0
Not Rated
Analysis of risk category of loans by class of loans
Total loans	638,807	629,406
Not Rated | Commercial & Industrial
Analysis of risk category of loans by class of loans
Total loans	8,327	5,947
Not Rated | Farmland
Analysis of risk category of loans by class of loans
Total loans	20	10
Not Rated | Non Farm, Non Residential
Analysis of risk category of loans by class of loans
Total loans	0	0
Not Rated | Agriculture
Analysis of risk category of loans by class of loans
Total loans	456	342
Not Rated | All Other Commercial
Analysis of risk category of loans by class of loans
Total loans	1,737	2,604
Not Rated | First Liens
Analysis of risk category of loans by class of loans
Total loans	188,857	204,329
Not Rated | Home Equity
Analysis of risk category of loans by class of loans
Total loans	36,952	35,653
Not Rated | Junior Liens
Analysis of risk category of loans by class of loans
Total loans	45,598	39,755
Not Rated | Multifamily
Analysis of risk category of loans by class of loans
Total loans	19	36
Not Rated | All Other Residential
Analysis of risk category of loans by class of loans
Total loans	12,426	13,529
Not Rated | Motor Vehicle
Analysis of risk category of loans by class of loans
Total loans	317,387	301,900
Not Rated | All Other Consumer
Analysis of risk category of loans by class of loans
Total loans	$ 27,028	$ 25,301