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Fair Values of Financial Instruments - Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements Other Than Goodwill (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Discounted cash flow | State and municipal securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 2,858 | $ 3,293
Discounted cash flow | State and municipal securities | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Maturity Call Date | 1 month | 1 month
US Muni BQ curve | A- | A-
Discounted cash flow | State and municipal securities | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Maturity Call Date | 15 years | 20 years
US Muni BQ curve | BBB- | BBB-
Discounted cash flow | State and municipal securities | Maturity Call Date US Muni BQ curve Discount rate | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Discount rate | 0.02 | 0.0069
Discounted cash flow | State and municipal securities | Maturity Call Date US Muni BQ curve Discount rate | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Discount rate | 0.05 | 0.05
Discounted cash flow | Corporate obligations and U.S. Government-sponsored mortgage backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 35 | $ 35
Discounted cash flow | Corporate obligations and U.S. Government-sponsored mortgage backed securities | Risk free rate plus Premium for illiquidity | Three-Month LIBOR |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Discount rate | 0.0200 | 0.0200
Collateral based measurements | Impaired loans (collateral dependent) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 5,653 | $ 11,866
Collateral based measurements | Impaired loans (collateral dependent) | Discount to reflect current market conditions and ultimate collectability | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability | 0.00 | 0.00
Collateral based measurements | Impaired loans (collateral dependent) | Discount to reflect current market conditions and ultimate collectability | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability | 0.10 | 0.10
Collateral based measurements | Impaired loans (collateral dependent) | Discount to reflect current market conditions and ultimate collectability | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability | 0.01 | 0.06
Appraisals | Other real estate owned |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 194 | $ 657
Appraisals | Other real estate owned | Discount to reflect current market conditions | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions (percent) | 0.00 | 0.00
Appraisals | Other real estate owned | Discount to reflect current market conditions | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions (percent) | 0.10 | 0.10
Appraisals | Other real estate owned | Discount to reflect current market conditions | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions (percent) | 0.37 | 0.04

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