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Mortgage Loan Servicing, Origination, and Loans Held for Sale (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Mortgage Loan Servicing, Origination, and Loans Held for Sale |  |  |  |  |
Residential mortgages serviced for others | $ 6,600,000 |  | $ 6,600,000 |  | $ 6,600,000
Contractually specified servicing fees earned | $ 4,100 | $ 4,200 | $ 12,400 | $ 12,100 |
Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenue from Contract with Customer, Excluding Assessed Tax | Revenue from Contract with Customer, Excluding Assessed Tax | Revenue from Contract with Customer, Excluding Assessed Tax | Revenue from Contract with Customer, Excluding Assessed Tax |
Mortgage servicing rights | $ 89,476 |  | $ 89,476 |  | $ 86,610
Changes in the fair value of MSRs and its offsetting hedge. |  |  |  |  |
(Decrease) increase in fair value of MSRs | 1,762 | $ 2,661 | 2,450 | $ 18,274 |
Decay of MSRs | (2,543) | (2,530) | (6,336) | (8,052) |
Gain (loss) related to derivatives | (2,170) | (3,572) | (4,288) | (17,963) |
Net effect on Consolidated Statements of Net Income | $ (2,951) | $ (3,441) | $ (8,174) | $ (7,741) |
Characteristics and sensitivity analysis of the MSR |  |  |  |  |
Composition of residential loans serviced for others | 100.00% |  | 100.00% |  | 100.00%
Weighted average life (in years) |  |  | 8 years 3 months 3 days |  | 8 years 4 months 13 days
Constant Prepayment rate (CPR) (as a percent) |  |  | 6.60% |  | 6.40%
Weighted average discount rate (as a percent) |  |  | 10.60% |  | 10.00%
Effect on fair value due to change in interest rates: |  |  |  |  |
25 basis point increase | $ 686 |  | $ 686 |  | $ 774
50 basis point increase | 1,231 |  | 1,231 |  | 1,428
25 basis point decrease | (848) |  | (848) |  | (902)
50 basis point decrease | $ (1,877) |  | $ (1,877) |  | $ (1,938)
Fixed-rate mortgage loans |  |  |  |  |
Characteristics and sensitivity analysis of the MSR |  |  |  |  |
Composition of residential loans serviced for others | 100.00% |  | 100.00% |  | 100.00%

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- Definition Amount of increase (decrease) in fair value from changes in the assumptions or model used to calculate the fair value of a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References No definition available. + Details
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- Definition All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-2 + Details
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- Definition Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481260/860-50-45-2 + Details
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