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Loan Servicing, Mortgage Origination, and Loans Held for Sale (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
MSRs |  |  |  |  |
Changes in the fair value of MSRs and its offsetting hedge. |  |  |  |  |
Increase (decrease) in fair value of MSRs | $ (6,976) | $ 1,861 | $ (595) |  |
Decay of MSRs | (4,589) | (4,215) | (3,762) |  |
Gains (loss) related to derivatives | 3,967 | (953) | 200 |  |
Net effect on statements of income | $ (7,598) | $ (3,307) | $ (4,157) |  |
Characteristics and sensitivity analysis of the MSR |  |  |  |  |
Composition of residential loans serviced for others |  |  |  | 100.00% | 100.00%
Weighted average life (in years) | 6 years 6 months 18 days | 7 years 10 months 17 days |  |  |
Constant Prepayment rate (CPR) (as a percent) | 10.30% | 7.30% |  |  |
Weighted average discount rate (as a percent) | 9.40% | 9.40% |  |  |
Effect on fair value due to change in interest rates: |  |  |  |  |
25 basis point increase |  |  |  | $ 2,477 | $ 1,504
50 basis point increase |  |  |  | 4,452 | 2,740
25 basis point decrease |  |  |  | (2,938) | (1,981)
50 basis point decrease |  |  |  | (6,228) | (4,421)
Custodial escrow balances maintained in connection with the loan servicing |  |  |  | $ 16,500 | $ 16,200
Fixed-rate mortgage loans |  |  |  |  |
Characteristics and sensitivity analysis of the MSR |  |  |  |  |
Composition of residential loans serviced for others |  |  |  | 99.80% | 99.80%
Adjustable-rate mortgage loans |  |  |  |  |
Characteristics and sensitivity analysis of the MSR |  |  |  |  |
Composition of residential loans serviced for others |  |  |  | 0.20% | 0.20%
First Financial Holdings, Inc. ("First Financial") |  |  |  |  |
Loans held for sale, loan servicing and mortgage origination |  |  |  |  |
Residential mortgages serviced for others |  |  |  | $ 3,300,000 | $ 3,100,000
Contractually specified servicing fees earned | $ 7,800 | $ 7,600 |  |  |
First Financial Holdings, Inc. ("First Financial") | MSRs |  |  |  |  |
Loans held for sale, loan servicing and mortgage origination |  |  |  |  |
Mortgage servicing rights | 34,700 | 34,700 |  | $ 30,500 | $ 34,700
Analysis of the activity in the MSRs |  |  |  |  |
Balance at beginning of the period | 34,700 |  |  |  |
Balance at end of period | $ 30,500 | $ 34,700 |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118959141&loc=d3e21310-158488 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118959141&loc=d3e21286-158488 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=117337389&loc=d3e21493-158490 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 + Details
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- Definition Estimated rate of prepayments of principal on servicing assets and servicing liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
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- Definition Weighted average life of financial assets and financial liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
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