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Mortgage Loan Servicing, Origination, and Loans Held for Sale (Tables) | 12 Months Ended
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Dec. 31, 2023
Mortgage Loan Servicing, Origination, and Loans Held for Sale |
Summary of changes in the fair value of MSRs and its offsetting hedge | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31, |
(Dollars in thousands) | ​ | 2023 | ​ | 2022 | ​ | 2021 |
(Decrease)/increase in fair value of MSRs | ​ | $ | (1,350) | ​ | $ | 14,886 | ​ | $ | 9,930 | ​
Decay of MSRs | ​ |  | (8,540) | ​ |  | (9,897) | ​ |  | (14,863) | ​
Loss related to derivatives | ​ |  | (1,420) | ​ |  | (18,212) | ​ |  | (4,892) | ​
Net effect on Consolidated Statements of Net Income | ​ | $ | (11,310) | ​ | $ | (13,223) | ​ | $ | (9,825) | ​
Schedule of characteristics and sensitivity analysis of the MSR | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | December 31, | ​
(Dollars in thousands) | 2023 |  | 2022 |
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 | ​ | 8.03 | years | ​ | 8.37 | years
Constant Prepayment rate (CPR) | ​ | 7.0 | % | ​ | 6.4 | %
Estimated impact on fair value of a 10% increase | $ | (522) | ​ | $ | (129) | ​
Estimated impact on fair value of a 20% increase | ​ | (1,014) | ​ | ​ | (266) | ​
Estimated impact on fair value of a 10% decrease | ​ | 551 | ​ | ​ | 118 | ​
Estimated impact on fair value of a 20% decrease | ​ | 1,128 | ​ | ​ | 219 | ​
Weighted average discount rate | ​ | 10.7 | % | ​ | 10.0 | %
Estimated impact on fair value of a 10% increase | $ | (3,270) | ​ | $ | (2,554) | ​
Estimated impact on fair value of a 20% increase | ​ | (6,458) | ​ | ​ | (5,321) | ​
Estimated impact on fair value of a 10% decrease | ​ | 3,242 | ​ | ​ | 2,158 | ​
Estimated impact on fair value of a 20% decrease | ​ | 6,283 | ​ | ​ | 3,831 | ​
Effect on fair value due to change in interest rates | ​ | ​ | ​ | ​ | ​ | ​
25 basis point increase | $ | 1,647 | ​ | $ | 774 | ​
50 basis point increase | ​ | 3,189 | ​ |  | 1,428 | ​
25 basis point decrease | ​ | (1,723) | ​ |  | (902) | ​
50 basis point decrease | ​ | (3,501) | ​ |  | (1,938) | ​

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- Definition Tabular disclosure of changes in the fair value of Mortgage Servicing Rights (MSRs) and its offsetting hedge. + References No definition available. + Details
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- Definition Tabular disclosure related to composition of residential mortgages serviced for others, characteristics and sensitivity analysis of the mortgage servicing rights. + References No definition available. + Details
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