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Mortgage Banking Activities, Mortgage Servicing Rights (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Summary of Mortgage Servicing Rights [Abstract] |  |  |  |  |
Number of residential mortgage loans serviced for others | 125,104 |  | 125,104 |  | 115,967
Outstanding principal balance of residential mortgage loans serviced for others | $ 22,084,578,000 |  | $ 22,084,578,000 |  | $ 20,382,192,000
Weighted average interest rate | 3.70% |  | 3.70% |  | 3.64%
Remaining term (in months) |  |  | 277 months |  | 280 months
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Beginning balance | $ 333,246,000 | $ 304,722,000 | $ 293,884,000 | $ 277,608,000 | $ 277,608,000
Additions | 3,842,000 | 3,154,000 | 10,812,000 | 9,757,000 |
Acquisitions | 3,334,000 | 2,669,000 | 34,755,000 | 33,807,000 |
Changes due to principal payments | (8,049,000) | (7,202,000) | (21,508,000) | (21,031,000) |
Change in fair value due to market assumption changes | (16,453,000) | 8,039,000 | (2,023,000) | 11,241,000 |
Ending balance | $ 315,920,000 | $ 311,382,000 | $ 315,920,000 | $ 311,382,000 | $ 293,884,000
Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract] |  |  |  |  |
Discount rate - risk-free rate plus a market premium (in hundredths) |  |  | 8.92% |  | 9.72%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed |  |  | 7.46% |  | 7.34%
Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan) |  |  | $ 73 |  | $ 69
Loan servicing costs - annually per loan based upon loan type, performing, maximum (in dollars per loan) |  |  | 94 |  | 94
Loan servicing costs - annually per loan based upon loan type, delinquent, minimum (in dollars per loan) |  |  | 150 |  | 150
Loan servicing costs - annually per loan based upon loan type, delinquent, maximum (in dollars per loan) |  |  | 500 |  | 500
Loan servicing costs - annually per loan based upon loan type, foreclosure, minimum (in dollars per loan) |  |  | 875 |  | 875
Loan servicing costs - annually per loan based upon loan type, foreclosure, maximum (in dollars per loan) |  |  | $ 8,000 |  | $ 8,000
Escrow earnings rate - indexed to rates paid on deposit accounts with comparable average life (in hundredths) |  |  | 3.63% |  | 3.90%
Primary secondary mortgage rate spread | 115 |  | 115 |  | 105
Delinquency rate |  |  | 2.09% |  | 2.06%

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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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