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Post-Retirement Benefits (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Post-Retirement Benefits      
Number of post-retirement health and life insurance benefit plans | item 3    
SCBT Post-retirement Benefit Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 157,000 $ 195,000 $ 209,000
Interest cost $ 7,000 $ 4,000 $ 3,000
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) $ (14,000) $ 11,000
Benefits paid (25,000) (28,000) (28,000)
Benefit obligation at end of year 125,000 157,000 195,000
Change in plan assets:      
Employer contribution 25,000 28,000 28,000
Benefits paid (25,000) (28,000) (28,000)
Funded status $ (125,000) $ (157,000) $ (195,000)
Weighted-average assumptions used to determine the benefit obligation      
Discount rate (as a percent) 4.60% 4.80% 2.10%
Weighted-average assumptions used to determine net periodic pension cost      
Discount rate (as a percent) 4.80% 2.10% 1.60%
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 $ 7,000 $ 4,000 $ 3,000
Recognized net actuarial loss   1,000  
Net periodic pension expense $ 7,000 $ 5,000 $ 3,000
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) $ (14,000) $ 11,000
Amortization of loss   $ (1,000)  
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 $ (14,000) $ (15,000) $ 11,000
Total recognized in net periodic benefit cost and other comprehensive income (7,000) (10,000) 14,000
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)      
2024 22,000    
2025 20,000    
2026 18,000    
2027 16,000    
2028 14,000    
2029-2033 45,000    
Estimated future benefit payments 135,000    
Expected contributions in the next fiscal year      
Amount of expected contributions in the next fiscal year 22,000    
FFCH Post-retirement Benefit Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 2,508,000 1,754,000 2,070,000
Interest cost $ 112,000 $ 35,000 $ 31,000
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 $ (1,428,000) $ 1,124,000 $ (110,000)
Benefits paid (179,000) (416,000) (246,000)
Less: Federal subsidy on benefits paid 4,000 11,000 9,000
Benefit obligation at end of year 1,017,000 2,508,000 1,754,000
Change in plan assets:      
Employer contribution 175,000 405,000 236,000
Participants' contributions 4,000 11,000 10,000
Benefits paid (179,000) (416,000) (246,000)
Funded status $ (1,017,000) $ (2,508,000) $ (1,754,000)
Weighted-average assumptions used to determine the benefit obligation      
Discount rate (as a percent) 4.60% 4.80% 2.10%
Weighted-average assumptions used to determine net periodic pension cost      
Discount rate (as a percent) 4.80% 2.10% 1.60%
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 $ 112,000 $ 35,000 $ 31,000
Recognized net actuarial loss 285,000 141,000 174,000
Net periodic pension expense $ 397,000 $ 176,000 $ 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 $ (1,428,000) $ 1,124,000 $ (110,000)
Amortization of loss $ (285,000) $ (141,000) $ (174,000)
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 $ (1,713,000) $ 983,000 $ (284,000)
Total recognized in net periodic benefit cost and other comprehensive income (1,316,000) $ 1,159,000 $ (79,000)
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 45,000    
Estimated future benefit payments (including expected future service as appropriate)      
2024 149,000    
2025 140,000    
2026 129,000    
2027 119,000    
2028 108,000    
2029-2033 386,000    
Estimated future benefit payments 1,031,000    
Expected contributions in the next fiscal year      
Amount of expected contributions in the next fiscal year 149,000    
Georgia Bank & Trust Retiree Medical Plan [Member]      
Change in benefit obligation:      
Benefit obligation at end of year $ 1,000