Post-Retirement Benefits (Details)	12 Months Ended
Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Post-Retirement Benefits
Number of post-retirement health and life insurance benefit plans \| item	2
Change in benefit obligation:
Benefit obligation at end of year	$ 0
Weighted-average assumptions used to determine net periodic pension cost
Discount rate (as a percent)	4.10%	3.50%	4.00%
Components of net periodic pension cost and other amounts recognized in other comprehensive income
Net periodic pension expense		$ (309,000)	$ (351,000)
Effects of one-percentage point change in assumed health care cost trend rates
One-Percentage Point Increase, Effect on aggregate service and interest cost	$ 5,000
One-Percentage Point Decrease, Effect on aggregate service and interest cost	(5,000)
One-Percentage Point Increase, Effect on postretirement benefit obligation	130
One-Percentage Point Decrease, Effect on postretirement benefit obligation	(118)
Other Comprehensive Income
Change in benefit obligation:
Interest cost	1,157,000	1,079,000	1,124,000
Components of net periodic pension cost and other amounts recognized in other comprehensive income
Interest cost	1,157,000	1,079,000	1,124,000
Recognized net actuarial loss	483,000	775,000	751,000
Net periodic pension expense	(600,000)	(396,000)	(211,000)
Net loss	2,722,000	(581,000)	491,000
Amortization of gain (loss)	(483,000)	(775,000)	(751,000)
Total amount recognized in other comprehensive income	(7,887,000)	(1,356,000)	(260,000)
Total recognized in net periodic benefit cost and other comprehensive income	1,639,000	(1,752,000)	(471,000)
SCBT Post-retirement Benefit Plan
Change in benefit obligation:
Benefit obligation at beginning of year	309,000	337,000	393,000
Interest cost	11,000	11,000	13,000
Actuarial (gain) loss	(33,000)	2,000	(29,000)
Benefits paid	(33,000)	(41,000)	(40,000)
Benefit obligation at end of year	254,000	309,000	337,000
Change in plan assets:
Employer contribution	33,000	41,000	40,000
Benefits paid	(33,000)	(41,000)	(40,000)
Funded (unfunded) status	$ (254,000)	$ (309,000)	$ (337,000)
Weighted-average assumptions used to determine the benefit obligation
Discount rate (as a percent)	2.70%	3.80%	3.20%
Weighted-average assumptions used to determine net periodic pension cost
Discount rate (as a percent)	3.80%	3.20%	3.50%
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	$ 11,000	$ 11,000	$ 13,000
Recognized net actuarial loss	6,000	6,000	10,000
Net periodic pension expense	17,000	16,000	23,000
Net loss	(33,000)	2,000	(29,000)
Amortization of gain (loss)	(6,000)	(6,000)	(10,000)
Total amount recognized in other comprehensive income	(39,000)	(4,000)	(39,000)
Total recognized in net periodic benefit cost and other comprehensive income	(22,000)	12,000	(16,000)
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	2,000,000
Effects of one-percentage point change in assumed health care cost trend rates
One-Percentage Point Increase, Effect on aggregate service and interest cost	1,000
One-Percentage Point Decrease, Effect on aggregate service and interest cost	(1,000)
One-Percentage Point Increase, Effect on postretirement benefit obligation	13,000
One-Percentage Point Decrease, Effect on postretirement benefit obligation	(12,000)
Estimated future benefit payments (including expected future service as appropriate)
2020	31,000
2021	30,000
2022	28,000
2023	27,000
2024	25,000
2025-2029	95,000
Estimated future benefit payments	236,000
Expected contributions in the next fiscal year
Amount of expected contributions in the next fiscal year	31,000
FFCH Post-retirement Benefit Plan
Change in benefit obligation:
Benefit obligation at beginning of year	2,281,000	2,392,000	2,447,000
Interest cost	82,000	73,000	81,000
Actuarial (gain) loss	7,000	89,000	126,000
Benefits paid	(273,000)	(286,000)	(274,000)
less: federal subsidy on benefits paid	12,000	13,000	12,000
Benefit obligation at end of year	2,109,000	2,281,000	2,392,000
Change in plan assets:
Employer contribution	261,000	286,000	274,000
Participants' contributions	12,000
Benefits paid	(273,000)	(286,000)	(274,000)
Funded (unfunded) status	$ (2,109,000)	$ (2,281,000)	$ (2,392,000)
Weighted-average assumptions used to determine the benefit obligation
Discount rate (as a percent)	2.70%	3.80%	3.20%
Weighted-average assumptions used to determine net periodic pension cost
Discount rate (as a percent)	3.80%	3.20%	3.50%
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	$ 82,000	$ 73,000	$ 81,000
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	151,000
Estimated future benefit payments (including expected future service as appropriate)
2020	240,000
2021	230,000
2022	218,000
2023	206,000
2024	193,000
2025-2029	752,000
Estimated future benefit payments	1,839,000
Expected contributions in the next fiscal year
Amount of expected contributions in the next fiscal year	240,000
FFCH Post-retirement Benefit Plan \| Other Comprehensive Income
Change in benefit obligation:
Interest cost	82,000	73,000	81,000
Components of net periodic pension cost and other amounts recognized in other comprehensive income
Interest cost	82,000	73,000	81,000
Recognized net actuarial loss	160,000	154,000	147,000
Net periodic pension expense	242,000	227,000	228,000
Net loss	7,000	89,000	126,000
Amortization of gain (loss)	(160,000)	(154,000)	(147,000)
Total amount recognized in other comprehensive income	(153,000)	(65,000)	(21,000)
Total recognized in net periodic benefit cost and other comprehensive income	$ 89,000	$ 162,000	$ 207,000

Represents the total amount of the benefits expected to be paid from a defined benefit plan.

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Represents the amount of net gain loss on the defined benefit plan.

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Represents the number of post-retirement health and life insurance benefit plans.

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Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount, before benefit payment, of receipt from prescription drug subsidy which increases benefit obligation of defined benefit postretirement plan.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate.

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Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.

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Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year.

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Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of contributions received by defined benefit plan from participant which increases plan assets.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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