Fair Value Measurement - Qualitative Information for Level 3 Assets Measured at Fair Value on a Non-Recurring Basis (Details) $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	$ 4,942	$ 5,697
Appraisals | Discount rate | Discount for costs to sell
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input	0.070	0.070
Appraisals | Discount rate | Discount for quick sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input	0.100	0.100
Appraisals | Discount rate | Interest rates | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input		0.0413
Appraisals | Discount rate | Interest rates | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input		0.0625
Discounted cash flows | Discount rate | Interest rates | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input	0.0413
Discounted cash flows | Discount rate | Interest rates | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans receivable, measurement input	0.0625