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Mortgage Loan Servicing, Origination, and Loans Held for Sale (Tables) | 6 Months Ended
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Jun. 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 |  | Six Months Ended | ​ |
(Dollars in thousands) |  | June 30, 2025 |  | June 30, 2024 |  | June 30, 2025 |  | June 30, 2024 |  |
(Decrease)/increase in fair value of MSRs | ​ | $ | (1,689) | ​ | $ | 830 | ​ | $ | (4,770) | ​ | $ | 3,214 | ​ | ​
Decay of MSRs | ​ |  | (2,284) | ​ |  | (2,566) | ​ |  | (3,312) | ​ |  | (4,007) | ​ | ​
Gain (loss) related to derivatives | ​ | ​ | 1,248 | ​ | ​ | (1,424) | ​ | ​ | 3,588 | ​ | ​ | (4,004) | ​ | ​
Net effect on Consolidated Statements of Income | ​ | $ | (2,725) | ​ | $ | (3,160) | ​ | $ | (4,494) | ​ | $ | (4,797) | ​ | ​
Schedule of characteristics and sensitivity analysis of the MSR | The characteristics and sensitivity analysis of the MSRs are included in the following table:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 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 | ​ | ​ | 7.66 | years | ​ | ​ | 7.97 | years | ​
Constant Prepayment rate (CPR) | ​ | ​ | 7.6 | % | ​ | ​ | 7.0 | % | ​
Estimated impact on fair value of a 10% increase | ​ | $ | (965) | ​ | ​ | $ | (658) | ​ | ​
Estimated impact on fair value of a 20% increase | ​ | ​ | (1,900) | ​ | ​ | ​ | (1,298) | ​ | ​
Estimated impact on fair value of a 10% decrease | ​ | ​ | 1,005 | ​ | ​ | ​ | 666 | ​ | ​
Estimated impact on fair value of a 20% decrease | ​ | ​ | 2,056 | ​ | ​ | ​ | 1,328 | ​ | ​
Weighted average discount rate | ​ | ​ | 10.7 | % | ​ | ​ | 10.9 | % | ​
Estimated impact on fair value of a 10% increase | ​ | $ | (3,215) | ​ | ​ | $ | (3,166) | ​ | ​
Estimated impact on fair value of a 20% increase | ​ | ​ | (6,362) | ​ | ​ | ​ | (6,339) | ​ | ​
Estimated impact on fair value of a 10% decrease | ​ | ​ | 3,167 | ​ | ​ | ​ | 3,022 | ​ | ​
Estimated impact on fair value of a 20% decrease | ​ | ​ | 6,075 | ​ | ​ | ​ | 5,738 | ​ | ​
Effect on fair value due to change in interest rates | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
25 basis point increase | ​ | $ | 2,313 | ​ | ​ | $ | 1,761 | ​ | ​
50 basis point increase | ​ | ​ | 4,439 | ​ | ​ | ​ | 3,296 | ​ | ​
25 basis point decrease | ​ | ​ | (2,389) | ​ | ​ | ​ | (1,952) | ​ | ​
50 basis point decrease | ​ | ​ | (4,803) | ​ | ​ | ​ | (4,052) | ​ | ​

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