Allowance for Loan Losses - Age Analysis of TDRs (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Troubled debt restructurings [Abstract]
Total TDRs	$ 3,613	$ 0
Nonaccrual
Troubled debt restructurings [Abstract]
Total TDRs	3,613	0
Accruing Loans, Current
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Accruing Loans, 30-89 Days Past Due
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate
Troubled debt restructurings [Abstract]
Total TDRs	3,613	0
Real Estate | Nonaccrual
Troubled debt restructurings [Abstract]
Total TDRs	3,613	0
Real Estate | Accruing Loans, Current
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Accruing Loans, 30-89 Days Past Due
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Construction & land development
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Construction & land development | Nonaccrual
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Construction & land development | Accruing Loans, Current
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Construction & land development | Accruing Loans, 30-89 Days Past Due
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Farmland
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Farmland | Nonaccrual
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Farmland | Accruing Loans, Current
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Farmland | Accruing Loans, 30-89 Days Past Due
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | 1- 4 family
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | 1- 4 family | Nonaccrual
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | 1- 4 family | Accruing Loans, Current
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | 1- 4 family | Accruing Loans, 30-89 Days Past Due
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Multifamily
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Multifamily | Nonaccrual
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Multifamily | Accruing Loans, Current
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Multifamily | Accruing Loans, 30-89 Days Past Due
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Non-farm non-residential
Troubled debt restructurings [Abstract]
Total TDRs	3,613	0
Real Estate | Non-farm non-residential | Nonaccrual
Troubled debt restructurings [Abstract]
Total TDRs	3,613	0
Real Estate | Non-farm non-residential | Accruing Loans, Current
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Real Estate | Non-farm non-residential | Accruing Loans, 30-89 Days Past Due
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Nonaccrual
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Accruing Loans, Current
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Accruing Loans, 30-89 Days Past Due
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Agricultural
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Agricultural | Nonaccrual
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Agricultural | Accruing Loans, Current
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Agricultural | Accruing Loans, 30-89 Days Past Due
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Commercial and industrial
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Commercial and industrial | Nonaccrual
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Commercial and industrial | Accruing Loans, Current
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Commercial and industrial | Accruing Loans, 30-89 Days Past Due
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Consumer and other
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Consumer and other | Nonaccrual
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Consumer and other | Accruing Loans, Current
Troubled debt restructurings [Abstract]
Total TDRs	0	0
Non-Real Estate | Consumer and other | Accruing Loans, 30-89 Days Past Due
Troubled debt restructurings [Abstract]
Total TDRs	$ 0	$ 0