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Fair Value of Assets and Liabilities - Valuation Technique (Details) - Level 3 | Sep. 30, 2020 USD ($) item | Dec. 31, 2019 USD ($) item
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Impaired loans | Appraisal value | Property specific adjustment |  |
Valuation techniques and significant unobservable inputs |  |
Impaired loans | $ 5,301,000 | $ 4,816,000
Foreclosed assets | Appraisal value | Property specific adjustment |  |
Valuation techniques and significant unobservable inputs |  |
Foreclosed assets | $ 10,000 | $ 8,000
Servicing rights |  |
Valuation techniques and significant unobservable inputs |  |
Servicing Asset, Valuation Technique [Extensible List] | us-gaap:ValuationTechniqueDiscountedCashFlowMember | us-gaap:ValuationTechniqueDiscountedCashFlowMember
Servicing rights | Prepayment speed assumptions |  |
Valuation techniques and significant unobservable inputs |  |
Servicing rights | $ 2,579,000 | $ 3,845,000
Servicing rights | Prepayment speed assumptions | Minimum |  |
Valuation techniques and significant unobservable inputs |  |
Servicing Asset, Measurement Input | item | 315 | 123
Servicing rights | Prepayment speed assumptions | Maximum |  |
Valuation techniques and significant unobservable inputs |  |
Servicing Asset, Measurement Input | 485 | 267
Servicing rights | Prepayment speed assumptions | Weighted average |  |
Valuation techniques and significant unobservable inputs |  |
Servicing Asset, Measurement Input | 396 | 194
Servicing rights | Discount rate |  |
Valuation techniques and significant unobservable inputs |  |
Servicing Asset, Measurement Input | 0.090 | 0.094
Servicing rights | Discount rate | Weighted average |  |
Valuation techniques and significant unobservable inputs |  |
Servicing Asset, Measurement Input | 0.090 | 0.094

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