Fair Value Measurements - Additional Quantitative Information (Details) $ in Thousands	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually	$ 18,627	$ 20,246
Non-recurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually	2,334	2,771
OREO	51	106
Bank property held for sale	9,101	10,676
Non-recurring basis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually	2,334	2,771
OREO	51	106
Bank property held for sale	9,101	10,676
Non-recurring basis | Level 3 | Appraisal of collateral | Loans evaluated individually
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually	2,334	2,771
Non-recurring basis | Level 3 | Appraisal of collateral | OREO
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO	51	106
Non-recurring basis | Level 3 | Appraisal of collateral or real estate listing price | Bank property held for sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bank property held for sale	$ 9,101	$ 10,676
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | Loans evaluated individually | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually (percent)	(42.8)	(30.0)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | Loans evaluated individually | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually (percent)	(100.0)	(100.0)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | Loans evaluated individually | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually (percent)	(51.8)	(37.0)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | OREO | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO (percent)	(33.0)	(25.0)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | OREO | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO (percent)	(100.0)	(100.0)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | OREO | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO (percent)	(67.9)	(54.5)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral or real estate listing price | Bank property held for sale | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bank property held for sale (percent)	(6.2)	(6.2)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral or real estate listing price | Bank property held for sale | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bank property held for sale (percent)	(64.9)	(64.9)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral or real estate listing price | Bank property held for sale | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bank property held for sale (percent)	(41.3)	(42.8)