EMPLOYEE BENEFIT PLANS - Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Pension Plans
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$ 8,009	$ 9,020
Service cost	0	0
Interest cost	331	315
Actuarial loss (gain)	1,068	(771)
Benefits paid	(300)	(291)
Settlements	(182)	(264)
Projected benefit obligation at end of year	8,926	8,009
Change in fair value of plan assets:
Fair value of plan assets at beginning of year	9,990	11,026
Expected return on plan assets	1,570	(481)
Contributions by employer	0	0
Benefits paid	(300)	(291)
Settlements	(182)	(264)
Fair value of plan assets at end of year	11,078	9,990
Overfunded status	(2,152)	(1,981)
Amounts recognized in consolidated balance sheet assets (liabilities)	2,152	1,981
Non-qualified Supplemental Executive Retirement Plan
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	3,033	3,451
Service cost	0	0
Interest cost	103	102
Actuarial loss (gain)	221	(142)
Benefits paid	(378)	(378)
Projected benefit obligation at end of year	2,979	3,033
Change in fair value of plan assets:
Fair value of plan assets at beginning of year	0	0
Contributions by employer	378	378
Benefits paid	(378)	(378)
Fair value of plan assets at end of year	0	0
Overfunded status	2,979	3,033
Amounts recognized in consolidated balance sheet assets (liabilities)	$ (2,979)	$ (3,033)

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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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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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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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 of payment to participant of defined benefit plan which decreases benefit obligation. 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.

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Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

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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 asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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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 cost recognized for passage of time related to defined benefit plan.

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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.

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

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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