Loans - Amortized Cost Basis of Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	$ 18,171	$ 15,439
Real Estate Collateral | Farmland
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	1,793	1,793
Real Estate Collateral | Owner-occupied, nonfarm nonresidential properties
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	267	285
Real Estate Collateral | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	398	594
Real Estate Collateral | Obligations (other than securities and leases) of states and political subdivisions
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	706
Real Estate Collateral | Other construction loans and all land development and other land loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	1,815	2,272
Real Estate Collateral | Multifamily (5 or more) residential properties
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	994	288
Real Estate Collateral | Non-owner occupied, nonfarm nonresidential properties
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	11,747	9,072
Real Estate Collateral | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	451	1,135
Non-Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	5,686	7,067
Non-Real Estate Collateral | Farmland
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	0	0
Non-Real Estate Collateral | Owner-occupied, nonfarm nonresidential properties
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	36	587
Non-Real Estate Collateral | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	5,492	5,600
Non-Real Estate Collateral | Obligations (other than securities and leases) of states and political subdivisions
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	0
Non-Real Estate Collateral | Other construction loans and all land development and other land loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	0	0
Non-Real Estate Collateral | Multifamily (5 or more) residential properties
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	0	0
Non-Real Estate Collateral | Non-owner occupied, nonfarm nonresidential properties
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	158	880
Non-Real Estate Collateral | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	$ 0	$ 0