Fair Value of Assets and Liabilities - Additional quantitative information (Details) - Nonrecurring basis - Level 3 $ in Thousands	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Foreclosed real estate	$ 586	$ 404
Appraisal Of Collateral | Appraisal adjustments | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Foreclosed real estate, unobservable input (in percent)	0
Appraisal Of Collateral | Appraisal adjustments | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Foreclosed real estate, unobservable input (in percent)	30