Allowance for Loan Losses (Details 6) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	$ 2,765,937	$ 2,666,442
Financing Receivable, Past Due	24,532	31,590
Financing Receivable, Not Past Due	2,741,405	2,634,852
Total loans	2,752,208	2,652,530
Loans not rated	2,752,208
Commercial & Industrial
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	730,616	599,955
Financing Receivable, Past Due	4,604	5,030
Financing Receivable, Not Past Due	726,012	594,925
Total loans	728,043	597,709
Farmland
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	123,638	139,951
Financing Receivable, Past Due	92	2,221
Financing Receivable, Not Past Due	123,546	137,730
Total loans	121,245	137,275
Non Farm, Non Residential
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	355,711	402,707
Financing Receivable, Past Due	1,233	3,853
Financing Receivable, Not Past Due	354,478	398,854
Total loans	354,567	401,775
Agriculture
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	145,573	163,199
Financing Receivable, Past Due	2,589	405
Financing Receivable, Not Past Due	142,984	162,794
Total loans	143,238	160,126
All Other Commercial
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	311,579	288,954
Financing Receivable, Past Due	860	109
Financing Receivable, Not Past Due	310,719	288,845
Total loans	309,990	287,562
First Liens
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	334,282	385,126
Financing Receivable, Past Due	5,671	9,202
Financing Receivable, Not Past Due	328,611	375,924
Total loans	333,092	383,912
Home Equity
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	63,244	71,034
Financing Receivable, Past Due	412	221
Financing Receivable, Not Past Due	62,832	70,813
Total loans	63,112	70,842
Junior Liens
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	54,957	55,097
Financing Receivable, Past Due	439	564
Financing Receivable, Not Past Due	54,518	54,533
Total loans	54,827	54,974
Multifamily
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	161,142	148,282
Financing Receivable, Past Due	1,577	0
Financing Receivable, Not Past Due	159,565	148,282
Total loans	160,803	147,943
All Other Residential
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	14,649	24,482
Financing Receivable, Past Due	60	1,972
Financing Receivable, Not Past Due	14,589	22,510
Total loans	14,607	24,406
Motor Vehicle
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	439,300	355,691
Financing Receivable, Past Due	6,810	7,741
Financing Receivable, Not Past Due	432,490	347,950
Total loans	437,572	354,198
All Other Consumer
Analysis of risk category of loans by class of loans
Financing Receivable Recorded Investment	31,246	31,964
Financing Receivable, Past Due	185	272
Financing Receivable, Not Past Due	31,061	31,692
Total loans	31,112	31,808
Pass
Analysis of risk category of loans by class of loans
Total loans	1,786,707	1,821,763
Pass | Commercial & Industrial
Analysis of risk category of loans by class of loans
Total loans	683,490	549,341
Pass | Farmland
Analysis of risk category of loans by class of loans
Total loans	109,589	119,858
Pass | Non Farm, Non Residential
Analysis of risk category of loans by class of loans
Total loans	318,566	381,404
Pass | Agriculture
Analysis of risk category of loans by class of loans
Total loans	117,125	127,144
Pass | All Other Commercial
Analysis of risk category of loans by class of loans
Total loans	306,147	283,266
Pass | First Liens
Analysis of risk category of loans by class of loans
Total loans	86,007	174,338
Pass | Home Equity
Analysis of risk category of loans by class of loans
Total loans	2,451	18,417
Pass | Junior Liens
Analysis of risk category of loans by class of loans
Total loans	2,102	2,839
Pass | Multifamily
Analysis of risk category of loans by class of loans
Total loans	159,318	146,497
Pass | All Other Residential
Analysis of risk category of loans by class of loans
Total loans	1,406	12,624
Pass | Motor Vehicle
Analysis of risk category of loans by class of loans
Total loans	331	2,880
Pass | All Other Consumer
Analysis of risk category of loans by class of loans
Total loans	175	3,155
Special Mention
Analysis of risk category of loans by class of loans
Total loans	59,672	41,100
Special Mention | Commercial & Industrial
Analysis of risk category of loans by class of loans
Total loans	17,129	19,253
Special Mention | Farmland
Analysis of risk category of loans by class of loans
Total loans	4,318	8,673
Special Mention | Non Farm, Non Residential
Analysis of risk category of loans by class of loans
Total loans	24,066	4,424
Special Mention | Agriculture
Analysis of risk category of loans by class of loans
Total loans	9,956	4,507
Special Mention | All Other Commercial
Analysis of risk category of loans by class of loans
Total loans	2,987	3,141
Special Mention | First Liens
Analysis of risk category of loans by class of loans
Total loans	1,065	926
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	46	64
Special Mention | Multifamily
Analysis of risk category of loans by class of loans
Total loans	105	112
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	64,331	82,662
Substandard | Commercial & Industrial
Analysis of risk category of loans by class of loans
Total loans	17,801	26,349
Substandard | Farmland
Analysis of risk category of loans by class of loans
Total loans	7,139	8,644
Substandard | Non Farm, Non Residential
Analysis of risk category of loans by class of loans
Total loans	11,154	12,269
Substandard | Agriculture
Analysis of risk category of loans by class of loans
Total loans	16,083	27,490
Substandard | All Other Commercial
Analysis of risk category of loans by class of loans
Total loans	812	1,120
Substandard | First Liens
Analysis of risk category of loans by class of loans
Total loans	8,724	4,382
Substandard | Home Equity
Analysis of risk category of loans by class of loans
Total loans	151	134
Substandard | Junior Liens
Analysis of risk category of loans by class of loans
Total loans	400	178
Substandard | Multifamily
Analysis of risk category of loans by class of loans
Total loans	1,380	1,315
Substandard | All Other Residential
Analysis of risk category of loans by class of loans
Total loans	62	205
Substandard | Motor Vehicle
Analysis of risk category of loans by class of loans
Total loans	602	538
Substandard | All Other Consumer
Analysis of risk category of loans by class of loans
Total loans	23	38
Doubtful
Analysis of risk category of loans by class of loans
Total loans	0	92
Doubtful | Commercial & Industrial
Analysis of risk category of loans by class of loans
Total loans	0	5
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	0
Doubtful | Home Equity
Analysis of risk category of loans by class of loans
Total loans	0	11
Doubtful | Junior Liens
Analysis of risk category of loans by class of loans
Total loans	0	76
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	841,498	706,913
Not Rated | Commercial & Industrial
Analysis of risk category of loans by class of loans
Total loans	9,623	2,761
Not Rated | Farmland
Analysis of risk category of loans by class of loans
Total loans	199	100
Not Rated | Non Farm, Non Residential
Analysis of risk category of loans by class of loans
Total loans	781	3,678
Not Rated | Agriculture
Analysis of risk category of loans by class of loans
Total loans	74	985
Not Rated | All Other Commercial
Analysis of risk category of loans by class of loans
Total loans	44	35
Not Rated | First Liens
Analysis of risk category of loans by class of loans
Total loans	237,296	204,266
Not Rated | Home Equity
Analysis of risk category of loans by class of loans
Total loans	60,510	52,280
Not Rated | Junior Liens
Analysis of risk category of loans by class of loans
Total loans	52,279	51,817
Not Rated | Multifamily
Analysis of risk category of loans by class of loans
Total loans	0	19
Not Rated | All Other Residential
Analysis of risk category of loans by class of loans
Total loans	13,139	11,577
Not Rated | Motor Vehicle
Analysis of risk category of loans by class of loans
Total loans	436,639	350,780
Not Rated | All Other Consumer
Analysis of risk category of loans by class of loans
Total loans	$ 30,914	$ 28,615