Loans - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	$ 35,555	$ 21,915	$ 34,340	$ 19,473
(Charge-offs)	(715)	(3,191)	(1,773)	(4,101)
Recoveries	101	125	252	398
Provision (Benefit) for Credit Loss Expense	1,967	5,680	4,089	8,759
Allowance for loan losses, Ending Balance	36,908	24,529	36,908	24,529
Farmland
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	224		221
(Charge-offs)	0		0
Recoveries	0		0
Provision (Benefit) for Credit Loss Expense	(100)		(97)
Allowance for loan losses, Ending Balance	124		124
Owner-occupied, nonfarm nonresidential properties
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	2,935		3,700
(Charge-offs)	0		(531)
Recoveries	3		5
Provision (Benefit) for Credit Loss Expense	(58)		(294)
Allowance for loan losses, Ending Balance	2,880		2,880
Agricultural production and other loans to farmers
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	28		24
(Charge-offs)	0		0
Recoveries	0		0
Provision (Benefit) for Credit Loss Expense	(16)		(12)
Allowance for loan losses, Ending Balance	12		12
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	6,479		6,233
(Charge-offs)	(14)		(70)
Recoveries	15		20
Provision (Benefit) for Credit Loss Expense	832		1,129
Allowance for loan losses, Ending Balance	7,312		7,312
Obligations (other than securities and leases) of states and political subdivisions
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	1,715		998
(Charge-offs)	(250)		(250)
Recoveries	0		0
Provision (Benefit) for Credit Loss Expense	860		1,577
Allowance for loan losses, Ending Balance	2,325		2,325
Other loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	73		68
(Charge-offs)	0		0
Recoveries	0		0
Provision (Benefit) for Credit Loss Expense	44		49
Allowance for loan losses, Ending Balance	117		117
Other construction loans and all land development and other land loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	2,006		1,956
(Charge-offs)	0		0
Recoveries	0		0
Provision (Benefit) for Credit Loss Expense	358		408
Allowance for loan losses, Ending Balance	2,364		2,364
Multifamily (5 or more) residential properties
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	2,754		2,724
(Charge-offs)	0		0
Recoveries	0		0
Provision (Benefit) for Credit Loss Expense	(440)		(410)
Allowance for loan losses, Ending Balance	2,314		2,314
Non-owner occupied, nonfarm nonresidential properties
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	11,326		8,658
(Charge-offs)	0		0
Recoveries	0		0
Provision (Benefit) for Credit Loss Expense	(1,164)		1,504
Allowance for loan losses, Ending Balance	10,162		10,162
1-4 Family Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	67		82
(Charge-offs)	0		0
Recoveries	0		0
Provision (Benefit) for Credit Loss Expense	43		28
Allowance for loan losses, Ending Balance	110		110
Home equity lines of credit
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	843		985
(Charge-offs)	0		0
Recoveries	2		2
Provision (Benefit) for Credit Loss Expense	184		42
Allowance for loan losses, Ending Balance	1,029		1,029
Residential Mortgages secured by first liens
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	3,550		4,539
(Charge-offs)	(42)		(70)
Recoveries	1		32
Provision (Benefit) for Credit Loss Expense	889		(103)
Allowance for loan losses, Ending Balance	4,398		4,398
Residential Mortgages secured by junior liens
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	224		241
(Charge-offs)	0		0
Recoveries	0		0
Provision (Benefit) for Credit Loss Expense	184		167
Allowance for loan losses, Ending Balance	408		408
Other revolving credit plans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	527		507
(Charge-offs)	(17)		(23)
Recoveries	3		5
Provision (Benefit) for Credit Loss Expense	(54)		(30)
Allowance for loan losses, Ending Balance	459		459
Automobile
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	182		132
(Charge-offs)	0		(5)
Recoveries	3		3
Provision (Benefit) for Credit Loss Expense	56		111
Allowance for loan losses, Ending Balance	241		241
Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	2,374		2,962
(Charge-offs)	(246)		(561)
Recoveries	47		95
Provision (Benefit) for Credit Loss Expense	227		(94)
Allowance for loan losses, Ending Balance	2,402		2,402
Commercial, industrial and agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance		10,532		8,287
(Charge-offs)		(2,623)		(2,648)
Recoveries		7		25
Provision (Benefit) for Credit Loss Expense		1,886		4,138
Allowance for loan losses, Ending Balance		9,802		9,802
Commercial mortgages
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance		7,492		6,952
(Charge-offs)		0		0
Recoveries		2		174
Provision (Benefit) for Credit Loss Expense		2,134		2,502
Allowance for loan losses, Ending Balance		9,628		9,628
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance		1,458		1,499
(Charge-offs)		(19)		(162)
Recoveries		0		3
Provision (Benefit) for Credit Loss Expense		1,237		1,336
Allowance for loan losses, Ending Balance		2,676		2,676
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance		2,138		2,411
(Charge-offs)		(413)		(1,005)
Recoveries		38		81
Provision (Benefit) for Credit Loss Expense		377		653
Allowance for loan losses, Ending Balance		2,140		2,140
Credit cards
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	65	112	66	84
(Charge-offs)	(39)	(41)	(72)	(72)
Recoveries	3	10	11	11
Provision (Benefit) for Credit Loss Expense	39	33	63	91
Allowance for loan losses, Ending Balance	68	114	68	114
Overdrafts
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses, Beginning Balance	183	183	244	240
(Charge-offs)	(107)	(95)	(191)	(214)
Recoveries	24	68	79	104
Provision (Benefit) for Credit Loss Expense	83	13	51	39
Allowance for loan losses, Ending Balance	$ 183	$ 169	$ 183	$ 169