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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, 2021 USD ($) | Dec. 31, 2020 USD ($)
Collateral dependent loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 18,848 | $ 13,123
Valuation Technique | Collateral based measurement | Collateral based measurement
Unobservable Inputs | Discount to reflect current market conditions and ultimate collectibility | Discount to reflect current market conditions and ultimate collectibility
Mortgage servicing rights |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 14,863 | $ 12,472
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% | 0.00%
Minimum | Mortgage servicing rights | Measurement Input, Discount Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Inputs | 0.080 | 0.078
Minimum | Mortgage servicing rights | Measurement Input, Constant Prepayment Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Inputs | 0.095 | 0.115
Minimum | Mortgage servicing rights | Measurement Input, Default Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Inputs | 0.000 | 0.000
Maximum | Collateral dependent loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability | 65.00% | 72.00%
Maximum | Mortgage servicing rights | Measurement Input, Discount Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Inputs | 0.080 | 0.078
Maximum | Mortgage servicing rights | Measurement Input, Constant Prepayment Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Inputs | 0.167 | 0.209
Maximum | Mortgage servicing rights | Measurement Input, Default Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Inputs | 0.185 | 0.010
Weighted Average | Collateral dependent loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Discount to reflect current market conditions and ultimate collectability | 6.90% | 12.40%
Weighted Average | Mortgage servicing rights | Measurement Input, Discount Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Inputs | 0.080 | 0.078
Weighted Average | Mortgage servicing rights | Measurement Input, Constant Prepayment Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Inputs | 0.127 | 0.175
Weighted Average | Mortgage servicing rights | Measurement Input, Default Rate |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Unobservable Inputs | 0.004 | 0.008

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