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Post-Retirement Benefits | 12 Months Ended
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Dec. 31, 2020
Post-Retirement Benefits |
Post-Retirement Benefits | Note 19—Post-Retirement Benefits At December 31, 2020, the Company and its subsidiary have two post-retirement health and life insurance benefit plans, South State Bank Retiree Medical Plan (the “retiree medical plan”) and the First Federal Retiree Welfare Plan (the “retiree welfare plan”). Retiree Medical Plan Under the retiree medical plan, post-retirement health and life insurance benefits are provided to eligible employees, such benefits being limited to those employees of the Company eligible for early retirement under the pension plan on or before December 31, 1993, and former employees who are currently receiving benefits. The plan was unfunded at December 31, 2020, and the liability for future benefits has been recorded in the consolidated financial statements. The following sets forth the retiree medical plan’s funded status and amounts recognized in the Company’s accompanying consolidated financial statements: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
(Dollars in thousands) | ​ | 2020 | ​ | 2019 | ​ | 2018 |
Change in benefit obligation: |  | ​ |  |  | ​ |  |  | ​ |  | ​
Benefit obligation at beginning of year | ​ | $ | 254 | ​ | $ | 309 | ​ | $ | 337 | ​
Interest cost | ​ |  | 6 | ​ |  | 11 | ​ |  | 11 | ​
Actuarial loss | ​ |  | (19) | ​ |  | (33) | ​ |  | 2 | ​
Benefits paid | ​ |  | (32) | ​ |  | (33) | ​ |  | (41) | ​
Benefit obligation at end of year | ​ |  | 209 | ​ |  | 254 | ​ |  | 309 | ​
Change in plan assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at beginning of year | ​ |  | — | ​ |  | — | ​ |  | — | ​
Employer contribution | ​ |  | 32 | ​ |  | 33 | ​ |  | 41 | ​
Benefits paid | ​ |  | (32) | ​ |  | (33) | ​ |  | (41) | ​
Fair value of plan assets at end of year | ​ |  | — | ​ |  | — | ​ |  | — | ​
Funded status | ​ | $ | (209) | ​ | $ | (254) | ​ | $ | (309) | ​
​ Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ | ​ | 2020 | ​ | 2019 | ​ | 2018 |
Weighted-average assumptions used to determine benefit obligation at December 31: |  |  |  |  |  |  | ​
Discount rate |  | 1.60 | % | 2.70 | % | 3.80 | %
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Discount rate |  | 2.70 | % | 3.80 | % | 3.20 | %
Assumed health care cost trend rates at December 31: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Health care cost trend rate assumed for next year |  | 5.00 | % | 5.00 | % | 5.00 | %
​ Components of net periodic benefit cost and other amounts recognized in other comprehensive income are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
(Dollars in thousands) | ​ | 2020 | ​ | 2019 | ​ | 2018 |
Interest cost |  | $ | 6 |  | $ | 11 |  | $ | 10 | ​
Recognized net actuarial loss | ​ |  | 2 | ​ |  | 6 | ​ |  | 6 | ​
Net periodic benefit cost | ​ |  | 8 | ​ |  | 17 | ​ |  | 16 | ​
Net (gain) loss | ​ |  | (19) | ​ |  | (33) | ​ |  | 2 | ​
Amortization of gain | ​ |  | (2) | ​ |  | (6) | ​ |  | (6) | ​
Total amount recognized in other comprehensive income | ​ |  | (21) | ​ |  | (39) | ​ |  | (4) | ​
Total recognized in net periodic benefit cost and other comprehensive income | ​ | $ | (13) | ​ | $ | (22) | ​ | $ | 12 | ​
​ There is no estimated net loss for the retiree medical plan that will be amortized from other comprehensive income into periodic benefit cost over the next fiscal year. Assumed health care cost trend rates have a significant effect on the amounts reported for the post-retirement benefit plan. A one-percentage point change in assumed health care cost trend rates would have the following effects at the end of 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | One-Percentage Point |
(Dollars in thousands) | ​ | Increase | ​ | Decrease |
Effect on total of interest cost |  | $ | 1 |  | $ | (1) | ​
Effect on postretirement benefit obligation | ​ |  | 10 | ​ |  | (10) | ​
​ Estimated future benefit payments (including expected future service as appropriate): ​
​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  |  | ​ |
2021 | ​ | $ | 27 | ​
2022 | ​ |  | 25 | ​
2023 | ​ |  | 24 | ​
2024 | ​ |  | 22 | ​
2025 | ​ |  | 20 | ​
2026-2030 | ​ |  | 71 | ​
​ | ​ | $ | 189 | ​
​ The Company expects to contribute approximately $27,000 to the retiree medical plan in 2021. Retiree Welfare Plan Under the retiree welfare plan, post-retirement health and life insurance benefits are provided to eligible employees, such benefits being limited to retired First Financial Holdings, Inc. employees who are currently receiving benefits. The plan was unfunded at December 31, 2020, and the liability for future benefits has been recorded in the consolidated financial statements. The following sets forth the retiree welfare plan’s funded status and amounts recognized in the Company’s accompanying consolidated financial statements: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
(Dollars in thousands) |  | 2020 |  | 2019 |  | 2018 | ​
Change in benefit obligation: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Benefit obligation at beginning of year | ​ | $ | 2,109 | ​ | $ | 2,281 | ​ | $ | 2,392 | ​
Interest cost | ​ | ​ | 54 | ​ |  | 82 | ​ |  | 73 | ​
Actuarial loss | ​ | ​ | 180 | ​ |  | 7 | ​ |  | 89 | ​
Benefits paid | ​ | ​ | (285) | ​ |  | (273) | ​ |  | (286) | ​
Less: Federal subsidy on benefits paid | ​ | ​ | 12 | ​ |  | 12 | ​ |  | 13 | ​
Benefit obligation at end of year | ​ | ​ | 2,070 | ​ |  | 2,109 | ​ |  | 2,281 | ​
Change in plan assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at beginning of year | ​ | ​ | — | ​ |  | — | ​ |  | — | ​
Employer contribution | ​ | ​ | 273 | ​ |  | 261 | ​ |  | 286 | ​
Participants’ contributions | ​ | ​ | 12 | ​ |  | 12 | ​ |  | — | ​
Benefits paid | ​ | ​ | (285) | ​ |  | (273) | ​ |  | (286) | ​
Fair value of plan assets at end of year | ​ | ​ | — | ​ |  | — | ​ |  | — | ​
Funded status | ​ | $ | (2,070) | ​ | $ | (2,109) | ​ | $ | (2,281) | ​
​ Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2020 |  | 2019 | ​ | 2018 | ​
Weighted-average assumptions used to determine benefit obligation at December 31: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Discount rate | ​ | 1.60 | % | 2.70 | % | 3.80 | %
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Discount rate | ​ | 2.70 | % | 3.80 | % | 3.20 | %
Assumed health care cost trend rates at December 31: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Health care cost trend rate assumed for next year | ​ | 5.00 | % | 5.00 | % | 5.00 | %
​ Components of net periodic benefit cost and other amounts recognized in other comprehensive income are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
(Dollars in thousands) |  | 2020 |  | 2019 |  | 2018 |
Interest cost | ​ | $ | 54 | ​ | $ | 82 | ​ | $ | 73 | ​
Recognized net actuarial loss | ​ | ​ | 151 | ​ |  | 160 | ​ |  | 154 | ​
Net periodic benefit cost | ​ | ​ | 205 | ​ |  | 242 | ​ |  | 227 | ​
Net loss | ​ | ​ | 180 | ​ |  | 7 | ​ |  | 89 | ​
Amortization of loss | ​ | ​ | (151) | ​ |  | (160) | ​ |  | (154) | ​
Total amount recognized in other comprehensive income | ​ | ​ | 29 | ​ |  | (153) | ​ |  | (65) | ​
Total recognized in net periodic benefit cost and other comprehensive income | ​ | $ | 234 | ​ | $ | 89 | ​ | $ | 162 | ​
​ The estimated net loss for the retiree welfare plan that will be amortized from other comprehensive income into periodic benefit cost over the next fiscal year is $174,000. Assumed health care cost trend rates have a significant effect on the amounts reported for the post-retirement benefit plan. A one-percentage point change in assumed health care cost trend rates would have the following effects at the end of 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | One-Percentage Point |
(Dollars in thousands) | ​ | Increase | ​ | Decrease |
Effect on aggregate service and interest cost |  | $ | 4 |  | $ | (3) | ​
Effect on postretirement benefit obligation | ​ | ​ | 125 | ​ | ​ | (114) | ​
​ Estimated future benefit payments (including expected future service as appropriate): ​
​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  |  | ​ |
2021 | ​ | $ | 243 | ​
2022 | ​ |  | 229 | ​
2023 | ​ |  | 213 | ​
2024 | ​ |  | 198 | ​
2025 | ​ |  | 181 | ​
2026-2030 | ​ |  | 671 | ​
​ | ​ | $ | 1,735 | ​
​ The Company expects to contribute approximately $243,000 to the retiree welfare plan in 2021.

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- Definition The entire disclosure for postemployment benefits, which may include supplemental unemployment benefits, obligations recognized for all types of benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement. Disclosure may also include discussion that an obligation for postemployment benefits is not accrued in accordance with regulation only because the amount cannot be reasonably estimated. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6410195&loc=d3e80090-111668 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI http://asc.fasb.org/topic&trid=2197446 + Details
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