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Mortgage Loan Servicing, Origination, and Loans Held for Sale (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Mortgage Loan Servicing, Origination, and Loans Held for Sale |  |  |
Mortgage servicing rights | $ 85,164 | $ 86,610 |
Changes in the fair value of MSRs and its offsetting hedge. |  |  |
(Decrease)/increase in fair value of MSRs | $ (1,350) | $ 14,886 | $ 9,930
Servicing Asset, Fair Value, Change in Fair Value, Valuation Input, Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenue from Contract with Customer, Excluding Assessed Tax | Revenue from Contract with Customer, Excluding Assessed Tax | Revenue from Contract with Customer, Excluding Assessed Tax
Decay of MSRs | $ (8,540) | $ (9,897) | $ (14,863)
Gain (loss) related to derivatives | (1,420) | (18,212) | (4,892)
Net effect on Consolidated Statements of Net Income | $ (11,310) | $ (13,223) | $ (9,825)
Characteristics and sensitivity analysis of the MSR |  |  |
Composition of residential loans serviced for others | 100.00% | 100.00% |
Weighted average life (in years) | 8 years 10 days | 8 years 4 months 13 days |
Constant Prepayment rate (CPR) (as a percent) | 7.00% | 6.40% |
Estimated impact on fair value of a 10% increase, Constant Prepayment rate (CPR) | $ (522) | $ (129) |
Estimated impact on fair value of a 20% increase, Constant Prepayment rate (CPR) | (1,014) | (266) |
Estimated impact on fair value of a 10% decrease, Constant Prepayment rate (CPR) | 551 | 118 |
Estimated impact on fair value of a 20% decrease, Constant Prepayment rate (CPR) | $ 1,128 | $ 219 |
Weighted average discount rate (as a percent) | 10.70% | 10.00% |
Estimated impact on fair value of a 10% increase, Weighted average discount rate | $ (3,270) | $ (2,554) |
Estimated impact on fair value of a 20% increase, Weighted average discount rate | (6,458) | (5,321) |
Estimated impact on fair value of a 10% decrease, Weighted average discount rate | 3,242 | 2,158 |
Estimated impact on fair value of a 20% decrease, Weighted average discount rate | 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) |
Fixed-rate mortgage loans |  |  |
Characteristics and sensitivity analysis of the MSR |  |  |
Composition of residential loans serviced for others | 100.00% | 100.00% |
First Financial Holdings, Inc. ("First Financial") |  |  |
Mortgage Loan Servicing, Origination, and Loans Held for Sale |  |  |
Residential mortgages serviced for others | $ 6,600,000 | $ 6,600,000 |
Contractually specified servicing fees earned | $ 16,500 | $ 16,200 |
Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenue from Contract with Customer, Excluding Assessed Tax | Revenue from Contract with Customer, Excluding Assessed Tax |
First Financial Holdings, Inc. ("First Financial") | MSRs |  |  |
Analysis of the activity in the MSRs |  |  |
Balance at beginning of the period | $ 86,600 |  |
Balance at end of period | $ 85,200 | $ 86,600 |

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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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- Definition All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-2 + Details
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