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Disclosures About Fair Value of Assets and Liabilities - Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements Other Than Goodwill (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
State and municipal securities | Discounted cash flow |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  | $ 5,565 | $ 2,444
State and municipal securities | Discounted cash flow | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Maturity/Call date | 1 month | 1 month |
US Muni BQ curve | BBB- | BBB- |
State and municipal securities | Discounted cash flow | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Maturity/Call date | 15 years | 15 years |
US Muni BQ curve | A- | A- |
State and municipal securities | Discounted cash flow | Discount rate | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Discount rate |  | 0.0075 | 0.0150
State and municipal securities | Discounted cash flow | Discount rate | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Discount rate |  | 0.04 | 0.04
State and municipal securities | Discounted cash flow | Weighted-average coupon | Weighted-average |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Discount rate |  | 0.04 | 0.04
Corporate obligations and U.S. Government-sponsored mortgage-backed securities | Discounted cash flow |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  | $ 35 | $ 35
Corporate obligations and U.S. Government-sponsored mortgage-backed securities | Discounted cash flow | Weighted-average coupon | Weighted-average |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Discount rate |  | 0 | 0
Corporate obligations and U.S. Government-sponsored mortgage-backed securities | Discounted cash flow | Risk free rate |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Risk free rate | 3 month LIBOR | 3 month LIBOR |
Corporate obligations and U.S. Government-sponsored mortgage-backed securities | Discounted cash flow | plus premium for illiquidity |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Discount rate |  | 0.02 | 0.02
Collateral dependent loans | Collateral based measurements |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  | $ 31,408 | $ 37,250
Collateral dependent loans | Collateral based measurements | 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 | 0
Collateral dependent loans | Collateral based measurements | 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 dependent loans | Collateral based measurements | 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 |  | 0.05 | 0.06
Other real estate owned | Appraisals |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  | $ 96 | $ 544
Other real estate owned | Appraisals | Discount to reflect current market conditions | Minimum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Other real estate owned |  | 0 | 0
Other real estate owned | Appraisals | Discount to reflect current market conditions | Maximum |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Other real estate owned |  | 0.72 | 0.30
Other real estate owned | Appraisals | Discount to reflect current market conditions | Weighted-average |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Other real estate owned |  | 0.44 | 0.26

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