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Mortgage Loan Servicing, Origination, and Loans Held for Sale (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Mortgage Loan Servicing, Origination, and Loans Held for Sale |  |  |  |  |
Residential mortgages serviced for others | $ 6,700,000,000 |  | $ 6,700,000,000 |  | $ 6,700,000,000
Contractually specified servicing fees earned | 4,200,000 | $ 4,200,000 | 12,700,000 | $ 12,600,000 |
Mortgage servicing rights | 84,491,000 |  | 84,491,000 |  | $ 89,795,000
Changes in the fair value of MSRs and its offsetting hedge. |  |  |  |  |
Decrease in fair value of MSRs | $ (412,000) | $ (5,560,000) | $ (5,182,000) | $ (2,346,000) |
Servicing Asset, Fair Value, Change in Fair Value, Valuation Input, 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 |
Decay of MSRs | $ (2,721,000) | $ (2,508,000) | $ (6,034,000) | $ (6,515,000) |
Gain (loss) related to derivatives | 289,000 | 3,815,000 | 3,877,000 | (189,000) |
Net effect on Consolidated Statements of Income | $ (2,844,000) | $ (4,253,000) | $ (7,339,000) | $ (9,050,000) |
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) |  |  | 7 years 6 months 14 days |  | 7 years 11 months 19 days
Constant Prepayment rate (CPR) (as a percent) |  |  | 7.90% |  | 7.00%
Estimated impact on fair value of a 10% increase, Constant Prepayment rate (CPR) | $ (1,033,000) |  | $ (1,033,000) |  | $ (658,000)
Estimated impact on fair value of a 20% increase, Constant Prepayment rate (CPR) | (2,018,000) |  | (2,018,000) |  | (1,298,000)
Estimated impact on fair value of a 10% decrease, Constant Prepayment rate (CPR) | 1,097,000 |  | 1,097,000 |  | 666,000
Estimated impact on fair value of a 20% decrease, Constant Prepayment rate (CPR) | 2,249,000 |  | $ 2,249,000 |  | $ 1,328,000
Weighted average discount rate (as a percent) |  |  | 10.70% |  | 10.90%
Estimated impact on fair value of a 10% increase, Weighted average discount rate | (3,177,000) |  | $ (3,177,000) |  | $ (3,166,000)
Estimated impact on fair value of a 20% increase, Weighted average discount rate | (6,274,000) |  | (6,274,000) |  | (6,339,000)
Estimated impact on fair value of a 10% decrease, Weighted average discount rate | 3,150,000 |  | 3,150,000 |  | 3,022,000
Estimated impact on fair value of a 20% decrease, Weighted average discount rate | 6,073,000 |  | 6,073,000 |  | 5,738,000
Effect on fair value due to change in interest rates: |  |  |  |  |
25 basis point increase | 2,447,000 |  | 2,447,000 |  | 1,761,000
50 basis point increase | 4,730,000 |  | 4,730,000 |  | 3,296,000
25 basis point decrease | (2,498,000) |  | (2,498,000) |  | (1,952,000)
50 basis point decrease | $ (5,033,000) |  | $ (5,033,000) |  | $ (4,052,000)
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 Indicates line item in statement of income or comprehensive income that includes increase (decrease) in fair value from change in input used to calculate fair value of contract to service financial asset under which benefit of servicing is expected to more than adequately compensate servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-3 + Details
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- Definition Amount of increase (decrease) in fair value from changes classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-3 + Details
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