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Loan Servicing, Mortgage Origination, and Loans Held for Sale (Tables) | 12 Months Ended
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Dec. 31, 2021
Loan Servicing, Mortgage 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) | ​ | 2021 | ​ | 2020 | ​ | 2019 |
Increase (decrease) in fair value of MSRs | ​ | $ | 9,930 | ​ | $ | (7,421) | ​ | $ | (6,976) | ​
Decay of MSRs | ​ |  | (14,863) | ​ |  | (8,793) | ​ |  | (4,589) | ​
Gain (loss) related to derivatives | ​ |  | (4,892) | ​ |  | 10,177 | ​ |  | 3,967 | ​
Net effect on statements of income | ​ | $ | (9,825) | ​ | $ | (6,037) | ​ | $ | (7,598) | ​
Schedule of characteristics and sensitivity analysis of the MSR | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
(Dollars in thousands) |  | 2021 |  | 2020 |
Composition of residential loans serviced for others | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fixed-rate mortgage loans | ​ | ​ | 99.9 | % | ​ | 99.9 | %
Adjustable-rate mortgage loans | ​ | ​ | 0.1 | % | ​ | 0.1 | %
Total | ​ | ​ | 100.0 | % | ​ | 100.0 | %
Weighted average life | ​ | ​ | 7.35 | years | ​ | 6.10 | years
Constant Prepayment rate (CPR) | ​ | ​ | 8.4 | % | ​ | 12.3 | %
Weighted average discount rate | ​ | ​ | 9.0 | % | ​ | 9.0 | %
Effect on fair value due to change in interest rates | ​ | ​ | ​ | ​ | ​ | ​ | ​
25 basis point increase | ​ | $ | 3,961 | ​ | $ | 2,744 | ​
50 basis point increase | ​ | ​ | 7,261 | ​ |  | 5,520 | ​
25 basis point decrease | ​ | ​ | (4,371) | ​ |  | (2,497) | ​
50 basis point decrease | ​ | ​ | (8,966) | ​ |  | (4,114) | ​

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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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