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Disclosures about Fair Value of Assets and Liabilities - Qualitative Information about Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements, Other than Goodwill (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2020 USD ($) consecutivePayment | Dec. 31, 2019 USD ($) consecutivePayment
Collateral dependent loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ | $ 14,781 |
Valuation Technique | Collateral based measurement |
Unobservable Inputs | Discount to reflect current market conditions and ultimate collectibility |
Impaired loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ |  | $ 6,806
Valuation Technique |  | Collateral based measurement
Unobservable Inputs |  | Discount to reflect current market conditions and ultimate collectibility
Mortgage servicing rights |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ | $ 11,705 | $ 14,327
Valuation Technique | Discounted cash flows | Discounted cash flows
Unobservable Inputs | Discount rate,Constant prepayment rate,Probability of default | Discount rate,Constant prepayment rate,Probability of default
Minimum | Collateral dependent loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability | 0.00% |
Minimum | Impaired loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability |  | 0.00%
Minimum | Mortgage servicing rights | Measurement Input, Discount Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable inputs | 0.078 | 0.087
Minimum | Mortgage servicing rights | Measurement Input, Constant Prepayment Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable inputs | 0.071 | 0.102
Minimum | Mortgage servicing rights | Measurement Input, Default Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable inputs | 0.007 | 0.001
Maximum | Collateral dependent loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability | 76.00% |
Maximum | Impaired loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability |  | 100.00%
Maximum | Mortgage servicing rights | Measurement Input, Discount Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable inputs | 0.078 | 0.090
Maximum | Mortgage servicing rights | Measurement Input, Constant Prepayment Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable inputs | 0.173 | 0.198
Maximum | Mortgage servicing rights | Measurement Input, Default Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable inputs | 0.197 | 0.029
Weighted Average | Collateral dependent loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability | 8.60% |
Weighted Average | Impaired loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability |  | 7.40%
Weighted Average | Mortgage servicing rights | Measurement Input, Discount Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable inputs | 0.078 | 0.087
Weighted Average | Mortgage servicing rights | Measurement Input, Constant Prepayment Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable inputs | 0.140 | 0.122
Weighted Average | Mortgage servicing rights | Measurement Input, Default Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable inputs | 0.019 | 0.007

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