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Mortgage Loan Servicing, Origination, and Loans Held for Sale (Tables) | 9 Months Ended
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Sep. 30, 2025
Mortgage Loan Servicing, Origination, and Loans Held for Sale |
Summary of changes in the fair value of MSRs and its offsetting hedge | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended |  | Nine Months Ended | ​ |
(Dollars in thousands) |  | September 30, 2025 |  | September 30, 2024 |  | September 30, 2025 |  | September 30, 2024 |  |
Decrease in fair value of MSRs | ​ | $ | (412) | ​ | $ | (5,560) | ​ | $ | (5,182) | ​ | $ | (2,346) | ​ | ​
Decay of MSRs | ​ |  | (2,721) | ​ |  | (2,508) | ​ |  | (6,034) | ​ |  | (6,515) | ​ | ​
Gain (loss) related to derivatives | ​ | ​ | 289 | ​ | ​ | 3,815 | ​ | ​ | 3,877 | ​ | ​ | (189) | ​ | ​
Net effect on Consolidated Statements of Income | ​ | $ | (2,844) | ​ | $ | (4,253) | ​ | $ | (7,339) | ​ | $ | (9,050) | ​ | ​
Schedule of characteristics and sensitivity analysis of the MSR | The characteristics and sensitivity analysis of the MSRs are included in the following table:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | December 31, | ​ | ​
(Dollars in thousands) |  | 2025 |  |  | 2024 |  |
Composition of residential loans serviced for others | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fixed-rate mortgage loans | ​ | ​ | 100.0 | % | ​ | ​ | 100.0 | % | ​
Adjustable-rate mortgage loans | ​ | ​ | — | % | ​ | ​ | — | % | ​
Total | ​ | ​ | 100.0 | % | ​ | ​ | 100.0 | % | ​
Weighted average life | ​ | ​ | 7.54 | years | ​ | ​ | 7.97 | years | ​
Constant Prepayment rate (CPR) | ​ | ​ | 7.9 | % | ​ | ​ | 7.0 | % | ​
Estimated impact on fair value of a 10% increase | ​ | $ | (1,033) | ​ | ​ | $ | (658) | ​ | ​
Estimated impact on fair value of a 20% increase | ​ | ​ | (2,018) | ​ | ​ | ​ | (1,298) | ​ | ​
Estimated impact on fair value of a 10% decrease | ​ | ​ | 1,097 | ​ | ​ | ​ | 666 | ​ | ​
Estimated impact on fair value of a 20% decrease | ​ | ​ | 2,249 | ​ | ​ | ​ | 1,328 | ​ | ​
Weighted average discount rate | ​ | ​ | 10.7 | % | ​ | ​ | 10.9 | % | ​
Estimated impact on fair value of a 10% increase | ​ | $ | (3,177) | ​ | ​ | $ | (3,166) | ​ | ​
Estimated impact on fair value of a 20% increase | ​ | ​ | (6,274) | ​ | ​ | ​ | (6,339) | ​ | ​
Estimated impact on fair value of a 10% decrease | ​ | ​ | 3,150 | ​ | ​ | ​ | 3,022 | ​ | ​
Estimated impact on fair value of a 20% decrease | ​ | ​ | 6,073 | ​ | ​ | ​ | 5,738 | ​ | ​
Effect on fair value due to change in interest rates | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
25 basis point increase | ​ | $ | 2,447 | ​ | ​ | $ | 1,761 | ​ | ​
50 basis point increase | ​ | ​ | 4,730 | ​ | ​ | ​ | 3,296 | ​ | ​
25 basis point decrease | ​ | ​ | (2,498) | ​ | ​ | ​ | (1,952) | ​ | ​
50 basis point decrease | ​ | ​ | (5,033) | ​ | ​ | ​ | (4,052) | ​ | ​

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