Fair Value of Financial Instruments and Fair Value Measurements - Quantitative Information for Financial Instruments Measured at Fair Value (Details) $ in Thousands	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	$ 518	$ 1,006
Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	4,984	5,939
Level 3 | Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent impaired loans	4,984	5,939
Other real estate owned	$ 518	$ 1,006
Level 3 | Nonrecurring | Minimum | Measurement Input, Appraised Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral Dependent Impaired Loans, Weighted Average Discount Range	0.25	0.25
Other Real Estate Owned, Weighted Average Discount Range	0	0
Level 3 | Nonrecurring | Maximum | Measurement Input, Appraised Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral Dependent Impaired Loans, Weighted Average Discount Range	1	1
Other Real Estate Owned, Weighted Average Discount Range	0.20	0.20