Fair Value - Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Non Recurring Basis (Details) - Fair Value, Measurements, Non Recurring - Significant Unobservable Inputs (Level 3) $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Farmland
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 659
Farmland | Measurement Input, Loss Severity | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.45
Farmland | Measurement Input, Loss Severity | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.54
Farmland | Measurement Input, Loss Severity | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.47
Owner-occupied, nonfarm nonresidential properties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 329
Owner-occupied, nonfarm nonresidential properties | Measurement Input, Loss Severity | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.60
Owner-occupied, nonfarm nonresidential properties | Measurement Input, Loss Severity | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.90
Owner-occupied, nonfarm nonresidential properties | Measurement Input, Loss Severity | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.80
Commercial and Industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 3,680
Commercial and Industrial | Measurement Input, Loss Severity | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0
Commercial and Industrial | Measurement Input, Loss Severity | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	1
Commercial and Industrial | Measurement Input, Loss Severity | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.39
Other construction loans and all land development and other land loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 1,790
Other construction loans and all land development and other land loans | Measurement Input, Loss Severity | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.25
Other construction loans and all land development and other land loans | Measurement Input, Loss Severity | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.41
Other construction loans and all land development and other land loans | Measurement Input, Loss Severity | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.28
Multifamily (5 or more) residential properties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 0
Multifamily (5 or more) residential properties | Measurement Input, Loss Severity | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.58
Multifamily (5 or more) residential properties | Measurement Input, Loss Severity | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.58
Non-owner occupied, nonfarm nonresidential properties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 9,622
Non-owner occupied, nonfarm nonresidential properties | Measurement Input, Loss Severity | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.25
Non-owner occupied, nonfarm nonresidential properties | Measurement Input, Loss Severity | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	1
Non-owner occupied, nonfarm nonresidential properties | Measurement Input, Loss Severity | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.29
Residential Mortgages secured by first liens
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 659
Residential Mortgages secured by first liens | Measurement Input, Loss Severity | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.31
Residential Mortgages secured by first liens | Measurement Input, Loss Severity | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique	0.31
Commercial, industrial, and agricultural
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		$ 2,910
Commercial, industrial, and agricultural | Measurement Input, Loss Severity | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique		0
Commercial, industrial, and agricultural | Measurement Input, Loss Severity | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique		1
Commercial, industrial, and agricultural | Measurement Input, Loss Severity | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique		0.54
Commercial mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		$ 1,147
Commercial mortgages | Measurement Input, Loss Severity | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique		0.25
Commercial mortgages | Measurement Input, Loss Severity | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique		1
Commercial mortgages | Measurement Input, Loss Severity | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation technique		0.52