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Post-Retirement Benefits (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
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% 3.50%
Components of net periodic pension cost and other amounts recognized in other comprehensive income      
Net periodic pension expense     $ (309,000)
Other Comprehensive Income      
Change in benefit obligation:      
Interest cost   $ 1,157,000 1,079,000
Components of net periodic pension cost and other amounts recognized in other comprehensive income      
Interest cost   1,157,000 1,079,000
Recognized net actuarial loss   483,000 775,000
Net periodic pension expense   (600,000) (396,000)
Net loss   2,722,000 (581,000)
Amortization of gain (loss)   (483,000) (775,000)
Total amount recognized in other comprehensive income   (7,887,000) (1,356,000)
Total recognized in net periodic benefit cost and other comprehensive income   1,639,000 (1,752,000)
SCBT Post-retirement Benefit Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 254,000 309,000 337,000
Interest cost 6,000 11,000 11,000
Actuarial (gain) loss (19,000) (33,000) 2,000
Benefits paid (32,000) (33,000) (41,000)
Benefit obligation at end of year 209,000 254,000 309,000
Change in plan assets:      
Employer contribution 32,000 33,000 41,000
Benefits paid (32,000) (33,000) (41,000)
Funded (unfunded) status $ (209,000) $ (254,000) $ (309,000)
Weighted-average assumptions used to determine the benefit obligation      
Discount rate (as a percent) 1.60% 2.70% 3.80%
Weighted-average assumptions used to determine net periodic pension cost      
Discount rate (as a percent) 2.70% 3.80% 3.20%
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 $ 6,000 $ 11,000 $ 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 0    
Effects of one-percentage point change in assumed health care cost trend rates      
One-Percentage Point Increase, Effect on aggregate service and interest cost 1,000    
One-Percentage Point Decrease, Effect on aggregate service and interest cost (1,000)    
One-Percentage Point Increase, Effect on postretirement benefit obligation 10,000    
One-Percentage Point Decrease, Effect on postretirement benefit obligation (10,000)    
Estimated future benefit payments (including expected future service as appropriate)      
2021 27,000    
2022 25,000    
2023 24,000    
2024 22,000    
2025 20,000    
2026-2030 71,000    
Estimated future benefit payments 189,000    
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 6,000 11,000 10,000
Components of net periodic pension cost and other amounts recognized in other comprehensive income      
Interest cost 6,000 11,000 10,000
Recognized net actuarial loss 2,000 6,000 6,000
Net periodic pension expense 8,000 17,000 16,000
Net loss (19,000) (33,000) 2,000
Amortization of gain (loss) (2,000) (6,000) (6,000)
Total amount recognized in other comprehensive income (21,000) (39,000) (4,000)
Total recognized in net periodic benefit cost and other comprehensive income (13,000) (22,000) 12,000
FFCH Post-retirement Benefit Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 2,109,000 2,281,000 2,392,000
Interest cost 54,000 82,000 73,000
Actuarial (gain) loss 180,000 7,000 89,000
Benefits paid (285,000) (273,000) (286,000)
less: federal subsidy on benefits paid 12,000 12,000 13,000
Benefit obligation at end of year 2,070,000 2,109,000 2,281,000
Change in plan assets:      
Employer contribution 273,000 261,000 286,000
Participants' contributions 12,000 12,000  
Benefits paid (285,000) (273,000) (286,000)
Funded (unfunded) status $ (2,070,000) $ (2,109,000) $ (2,281,000)
Weighted-average assumptions used to determine the benefit obligation      
Discount rate (as a percent) 1.60% 2.70% 3.80%
Weighted-average assumptions used to determine net periodic pension cost      
Discount rate (as a percent) 2.70% 3.80% 3.20%
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 $ 54,000 $ 82,000 $ 73,000
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 174,000    
Effects of one-percentage point change in assumed health care cost trend rates      
One-Percentage Point Increase, Effect on aggregate service and interest cost 4,000    
One-Percentage Point Decrease, Effect on aggregate service and interest cost (3,000)    
One-Percentage Point Increase, Effect on postretirement benefit obligation 125    
One-Percentage Point Decrease, Effect on postretirement benefit obligation (114)    
Estimated future benefit payments (including expected future service as appropriate)      
2021 243,000    
2022 229,000    
2023 213,000    
2024 198,000    
2025 181,000    
2026-2030 671,000    
Estimated future benefit payments 1,735,000    
Expected contributions in the next fiscal year      
Amount of expected contributions in the next fiscal year 243,000    
FFCH Post-retirement Benefit Plan | Other Comprehensive Income      
Change in benefit obligation:      
Interest cost 54,000 82,000 73,000
Components of net periodic pension cost and other amounts recognized in other comprehensive income      
Interest cost 54,000 82,000 73,000
Recognized net actuarial loss 151,000 160,000 154,000
Net periodic pension expense 205,000 242,000 227,000
Net loss 180,000 7,000 89,000
Amortization of gain (loss) 151,000 160,000 154,000
Total amount recognized in other comprehensive income 29,000 (153,000) (65,000)
Total recognized in net periodic benefit cost and other comprehensive income $ 234,000 $ 89,000 $ 162,000