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Post-Retirement Benefits (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Post-Retirement Benefits |  |  |
Number of post-retirement health and life insurance benefit plans | item | 2 |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | $ 0 |  |
Benefit obligation at end of year | 0 | $ 0 |
Weighted-average assumptions used to determine net periodic pension cost |  |  |
Discount rate (as a percent) |  |  | 4.10%
Other Comprehensive Income |  |  |
Change in benefit obligation: |  |  |
Interest cost |  |  | $ 1,157,000
Components of net periodic pension cost and other amounts recognized in other comprehensive income |  |  |
Interest cost |  |  | 1,157,000
Recognized net actuarial loss |  |  | 483,000
Net periodic pension expense |  |  | (600,000)
Net loss |  |  | 2,722,000
Amortization of gain (loss) |  |  | (483,000)
Total amount recognized in other comprehensive income |  |  | (7,887,000)
Total recognized in net periodic benefit cost and other comprehensive income |  |  | 1,639,000
SCBT Post-retirement Benefit Plan |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 209,000 | 254,000 | 309,000
Interest cost | 3,000 | 6,000 | 11,000
Actuarial (gain) loss | 11,000 | (19,000) | (33,000)
Benefits paid | (28,000) | (32,000) | (33,000)
Benefit obligation at end of year | 195,000 | 209,000 | 254,000
Change in plan assets: |  |  |
Employer contribution | 28,000 | 32,000 | 33,000
Benefits paid | (28,000) | (32,000) | (33,000)
Funded (unfunded) status | $ (195,000) | $ (209,000) | $ (254,000)
Weighted-average assumptions used to determine the benefit obligation |  |  |
Discount rate (as a percent) | 2.10% | 1.60% | 2.70%
Weighted-average assumptions used to determine net periodic pension cost |  |  |
Discount rate (as a percent) | 1.60% | 2.70% | 3.80%
Assumed health care cost trend rates |  |  |
Health care cost trend rate assumed for next fiscal year (as a percent) | 5.00% | 5.00% | 5.00%
Components of net periodic pension cost and other amounts recognized in other comprehensive income |  |  |
Interest cost | $ 3,000 | $ 6,000 | $ 11,000
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 |  |  |
Estimated net loss for the plan that will be amortized from other comprehensive income into periodic benefit cost over the next fiscal year | 1,000 |  |
Estimated future benefit payments (including expected future service as appropriate) |  |  |
2022 | 27,000 |  |
2023 | 25,000 |  |
2024 | 23,000 |  |
2025 | 22,000 |  |
2026 | 20,000 |  |
2027-2031 | 67,000 |  |
Estimated future benefit payments | 184,000 |  |
Expected contributions in the next fiscal year |  |  |
Amount of expected contributions in the next fiscal year | 27,000 |  |
SCBT Post-retirement Benefit Plan | Other Comprehensive Income |  |  |
Change in benefit obligation: |  |  |
Interest cost | 3,000 | 6,000 | 11,000
Components of net periodic pension cost and other amounts recognized in other comprehensive income |  |  |
Interest cost | 3,000 | 6,000 | 11,000
Recognized net actuarial loss |  | 2,000 | 6,000
Net periodic pension expense | 3,000 | 8,000 | 17,000
Net loss | 11,000 | (19,000) | (33,000)
Amortization of gain (loss) |  | (2,000) | (6,000)
Total amount recognized in other comprehensive income | 11,000 | (21,000) | (39,000)
Total recognized in net periodic benefit cost and other comprehensive income | 14,000 | (13,000) | (22,000)
FFCH Post-retirement Benefit Plan |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 2,070,000 | 2,109,000 | 2,281,000
Interest cost | 31,000 | 54,000 | 82,000
Actuarial (gain) loss | (110,000) | 180,000 | 7,000
Benefits paid | (246,000) | (285,000) | (273,000)
less: federal subsidy on benefits paid | 9,000 | 12,000 | 12,000
Benefit obligation at end of year | 1,754,000 | 2,070,000 | 2,109,000
Change in plan assets: |  |  |
Employer contribution | 236,000 | 273,000 | 261,000
Participants' contributions | 10,000 | 12,000 | 12,000
Benefits paid | (246,000) | (285,000) | (273,000)
Funded (unfunded) status | $ (1,754,000) | $ (2,070,000) | $ (2,109,000)
Weighted-average assumptions used to determine the benefit obligation |  |  |
Discount rate (as a percent) | 2.10% | 1.60% | 2.70%
Weighted-average assumptions used to determine net periodic pension cost |  |  |
Discount rate (as a percent) | 1.60% | 2.70% | 3.80%
Assumed health care cost trend rates |  |  |
Health care cost trend rate assumed for next fiscal year (as a percent) | 5.00% | 5.00% | 5.00%
Components of net periodic pension cost and other amounts recognized in other comprehensive income |  |  |
Interest cost | $ 31,000 | $ 54,000 | $ 82,000
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 |  |  |
Estimated net loss for the plan that will be amortized from other comprehensive income into periodic benefit cost over the next fiscal year | 141,000 |  |
Estimated future benefit payments (including expected future service as appropriate) |  |  |
2022 | 216,000 |  |
2023 | 203,000 |  |
2024 | 189,000 |  |
2025 | 174,000 |  |
2026 | 159,000 |  |
2027-2031 | 583,000 |  |
Estimated future benefit payments | 1,524,000 |  |
Expected contributions in the next fiscal year |  |  |
Amount of expected contributions in the next fiscal year | 216,000 |  |
FFCH Post-retirement Benefit Plan | Other Comprehensive Income |  |  |
Change in benefit obligation: |  |  |
Interest cost | 31,000 | 54,000 | 82,000
Components of net periodic pension cost and other amounts recognized in other comprehensive income |  |  |
Interest cost | 31,000 | 54,000 | 82,000
Recognized net actuarial loss | 174,000 | 151,000 | 160,000
Net periodic pension expense | 205,000 | 205,000 | 242,000
Net loss | (110,000) | 180,000 | 7,000
Amortization of gain (loss) | 174,000 | 151,000 | 160,000
Total amount recognized in other comprehensive income | (284,000) | 29,000 | (153,000)
Total recognized in net periodic benefit cost and other comprehensive income | $ (79,000) | $ 234,000 | $ 89,000

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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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