Loans - Nonaccrual Loans and Loans Past Due over 90 Days Still Accruing Interest by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 31,882	$ 30,359
Nonaccrual With No Allowance for Credit Loss	6,890	6,723
Loans Past Due over 89 Days Still Accruing	987	325
Farmland
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,843	1,844
Nonaccrual With No Allowance for Credit Loss	50	51
Loans Past Due over 89 Days Still Accruing	0	0
Owner-occupied, nonfarm nonresidential properties
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,482	1,781
Nonaccrual With No Allowance for Credit Loss	1,179	909
Loans Past Due over 89 Days Still Accruing	0	0
Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Nonaccrual	6,477	6,657
Nonaccrual With No Allowance for Credit Loss	587	464
Loans Past Due over 89 Days Still Accruing	884	0
Obligations (other than securities and leases) of states and political subdivisions
Financing Receivable, Past Due [Line Items]
Nonaccrual	706
Nonaccrual With No Allowance for Credit Loss	0
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	1,892	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	994	288
Nonaccrual With No Allowance for Credit Loss	0	0
Loans Past Due over 89 Days Still Accruing	0	0
Non-owner occupied, nonfarm nonresidential properties
Financing Receivable, Past Due [Line Items]
Nonaccrual	13,980	11,932
Nonaccrual With No Allowance for Credit Loss	489	394
Loans Past Due over 89 Days Still Accruing	0	0
Home equity lines of credit
Financing Receivable, Past Due [Line Items]
Nonaccrual	754	685
Nonaccrual With No Allowance for Credit Loss	754	685
Loans Past Due over 89 Days Still Accruing	0	0
Residential Mortgages secured by first liens
Financing Receivable, Past Due [Line Items]
Nonaccrual	3,283	4,175
Nonaccrual With No Allowance for Credit Loss	3,283	3,495
Loans Past Due over 89 Days Still Accruing	76	283
Residential Mortgages secured by junior liens
Financing Receivable, Past Due [Line Items]
Nonaccrual	100	114
Nonaccrual With No Allowance for Credit Loss	100	114
Loans Past Due over 89 Days Still Accruing	0	0
Other revolving credit plans
Financing Receivable, Past Due [Line Items]
Nonaccrual	17	6
Nonaccrual With No Allowance for Credit Loss	17	6
Loans Past Due over 89 Days Still Accruing	0	0
Automobile
Financing Receivable, Past Due [Line Items]
Nonaccrual	7	32
Nonaccrual With No Allowance for Credit Loss	7	32
Loans Past Due over 89 Days Still Accruing	0	0
Other consumer
Financing Receivable, Past Due [Line Items]
Nonaccrual	347	496
Nonaccrual With No Allowance for Credit Loss	347	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	$ 27	$ 34