Loans - Amortized Cost Basis of Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	$ 9,479	$ 15,439
Non-Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	2,214	7,067
Farmland | Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	1,768	1,793
Farmland | Non-Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	0	0
Owner-occupied, nonfarm nonresidential properties | Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	247	285
Owner-occupied, nonfarm nonresidential properties | Non-Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	17	587
Commercial and Industrial | Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	347	594
Commercial and Industrial | Non-Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	2,197	5,600
Obligations (other than securities and leases) of states and political subdivisions | Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	430
Obligations (other than securities and leases) of states and political subdivisions | Non-Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	0
Other construction loans and all land development and other land loans | Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	1,828	2,272
Other construction loans and all land development and other land loans | Non-Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	0	0
Multifamily (5 or more) residential properties | Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	972	288
Multifamily (5 or more) residential properties | Non-Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	0	0
Non-owner occupied, nonfarm nonresidential properties | Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	3,442	9,072
Non-owner occupied, nonfarm nonresidential properties | Non-Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	0	880
Residential Mortgages secured by first liens | Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	445	1,135
Residential Mortgages secured by first liens | Non-Real Estate Collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost basis of collateral-dependent loans	$ 0	$ 0