Loans - Nonaccrual Loans and Loans Past Due over 89 Days Still Accruing Interest by Class of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 32,299	$ 30,359
Nonaccrual With No Allowance for Credit Loss	20,558	16,930
Loans Past Due over 89 Days Still Accruing	611	325
Farmland
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,817	1,844
Nonaccrual With No Allowance for Credit Loss	606	633
Loans Past Due over 89 Days Still Accruing	0	0
Owner-occupied, nonfarm nonresidential properties
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,501	1,781
Nonaccrual With No Allowance for Credit Loss	1,397	967
Loans Past Due over 89 Days Still Accruing	0	0
Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Nonaccrual	6,318	6,657
Nonaccrual With No Allowance for Credit Loss	1,302	959
Loans Past Due over 89 Days Still Accruing	141	0
Obligations (other than securities and leases) of states and political subdivisions
Financing Receivable, Past Due [Line Items]
Nonaccrual	430
Nonaccrual With No Allowance for Credit Loss	430
Loans Past Due over 89 Days Still Accruing	0
Other construction loans and all land development and other land loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,905	2,349
Nonaccrual With No Allowance for Credit Loss	77	77
Loans Past Due over 89 Days Still Accruing	0	0
Multifamily (5 or more) residential properties
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,181	288
Nonaccrual With No Allowance for Credit Loss	5	0
Loans Past Due over 89 Days Still Accruing	0	0
Non-owner occupied, nonfarm nonresidential properties
Financing Receivable, Past Due [Line Items]
Nonaccrual	14,352	11,932
Nonaccrual With No Allowance for Credit Loss	11,946	9,466
Loans Past Due over 89 Days Still Accruing	312	0
Home equity lines of credit
Financing Receivable, Past Due [Line Items]
Nonaccrual	850	685
Nonaccrual With No Allowance for Credit Loss	850	685
Loans Past Due over 89 Days Still Accruing	0	0
Residential Mortgages secured by first liens
Financing Receivable, Past Due [Line Items]
Nonaccrual	3,273	4,175
Nonaccrual With No Allowance for Credit Loss	3,273	3,495
Loans Past Due over 89 Days Still Accruing	154	283
Residential Mortgages secured by junior liens
Financing Receivable, Past Due [Line Items]
Nonaccrual	182	114
Nonaccrual With No Allowance for Credit Loss	182	114
Loans Past Due over 89 Days Still Accruing	0	0
Other revolving credit plans
Financing Receivable, Past Due [Line Items]
Nonaccrual	9	6
Nonaccrual With No Allowance for Credit Loss	9	6
Loans Past Due over 89 Days Still Accruing	0	0
Automobile
Financing Receivable, Past Due [Line Items]
Nonaccrual	51	32
Nonaccrual With No Allowance for Credit Loss	51	32
Loans Past Due over 89 Days Still Accruing	0	0
Other consumer
Financing Receivable, Past Due [Line Items]
Nonaccrual	430	496
Nonaccrual With No Allowance for Credit Loss	430	496
Loans Past Due over 89 Days Still Accruing	0	8
Credit cards
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	0
Nonaccrual With No Allowance for Credit Loss	0	0
Loans Past Due over 89 Days Still Accruing	$ 4	$ 34