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Post-Retirement Benefits (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Post-Retirement Benefits      
Number of post-retirement health and life insurance benefit plans | item 2    
SCBT Post-retirement Benefit Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 195,000 $ 209,000 $ 254,000
Interest cost $ 4,000 $ 3,000 $ 6,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Actuarial (gain) loss $ (14,000) $ 11,000 $ (19,000)
Benefits paid (28,000) (28,000) (32,000)
Benefit obligation at end of year 157,000 195,000 209,000
Change in plan assets:      
Employer contribution 28,000 28,000 32,000
Benefits paid (28,000) (28,000) (32,000)
Funded status $ (157,000) $ (195,000) $ (209,000)
Weighted-average assumptions used to determine the benefit obligation      
Discount rate (as a percent) 4.80% 2.10% 1.60%
Weighted-average assumptions used to determine net periodic pension cost      
Discount rate (as a percent) 2.10% 1.60% 2.70%
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 (loss) income      
Interest cost $ 4,000 $ 3,000 $ 6,000
Recognized net actuarial loss 1,000   2,000
Net periodic pension expense $ 5,000 $ 3,000 $ 8,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible List] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Net (gain) loss $ (14,000) $ 11,000 $ (19,000)
Amortization of loss $ (1,000)   $ (2,000)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Total amount recognized in other comprehensive income $ (15,000) $ 11,000 $ (21,000)
Total recognized in net periodic benefit cost and other comprehensive income (10,000) 14,000 (13,000)
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 gain/loss for the plan that will be amortized from other comprehensive income into periodic benefit cost over the next fiscal year 0    
Estimated future benefit payments (including expected future service as appropriate)      
2023 26,000    
2024 25,000    
2025 22,000    
2026 20,000    
2027 18,000    
2028-2032 59,000    
Estimated future benefit payments 170,000    
Expected contributions in the next fiscal year      
Amount of expected contributions in the next fiscal year 26,000    
FFCH Post-retirement Benefit Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 1,754,000 2,070,000 2,109,000
Interest cost $ 35,000 $ 31,000 $ 54,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Actuarial (gain) loss $ 1,124,000 $ (110,000) $ 180,000
Benefits paid (416,000) (246,000) (285,000)
Less: Federal subsidy on benefits paid 11,000 9,000 12,000
Benefit obligation at end of year 2,508,000 1,754,000 2,070,000
Change in plan assets:      
Employer contribution 405,000 236,000 273,000
Participants' contributions 11,000 10,000 12,000
Benefits paid (416,000) (246,000) (285,000)
Funded status $ (2,508,000) $ (1,754,000) $ (2,070,000)
Weighted-average assumptions used to determine the benefit obligation      
Discount rate (as a percent) 4.80% 2.10% 1.60%
Weighted-average assumptions used to determine net periodic pension cost      
Discount rate (as a percent) 2.10% 1.60% 2.70%
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 (loss) income      
Interest cost $ 35,000 $ 31,000 $ 54,000
Recognized net actuarial loss 141,000 174,000 151,000
Net periodic pension expense $ 176,000 $ 205,000 $ 205,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible List] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Net (gain) loss $ 1,124,000 $ (110,000) $ 180,000
Amortization of loss $ (141,000) $ (174,000) $ (151,000)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Total amount recognized in other comprehensive income $ 983,000 $ (284,000) $ 29,000
Total recognized in net periodic benefit cost and other comprehensive income 1,159,000 $ (79,000) $ 234,000
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 gain/loss for the plan that will be amortized from other comprehensive income into periodic benefit cost over the next fiscal year 285,000    
Estimated future benefit payments (including expected future service as appropriate)      
2023 368,000    
2024 345,000    
2025 320,000    
2026 294,000    
2027 268,000    
2028-2032 968,000    
Estimated future benefit payments 2,563,000    
Expected contributions in the next fiscal year      
Amount of expected contributions in the next fiscal year $ 368,000