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EMPLOYEE RETIREMENT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Schedule of Weighted Average Plan Assets Allocation [Table Text Block] | The Company’s pension plan’s weighted average asset allocation at December 31, 2017 and 2016, by asset category, was as follows:
|  | Plan Assets at December 31,
|  | 2017 |  | 2016
Asset Category: |  |  |  |  |  |  |  |
Equity Securities |  |  | 55 | % |  |  | 54 | %
Fixed Income Securities |  |  | 39 | % |  |  | 38 | %
Other |  |  | 6 | % |  |  | 8 | %
Total |  |  | 100 | % |  |  | 100 | %
Schedule of Assumptions Used to Determine, Net Funded Status of Plan [Table Text Block] | Assumptions used in determining the funded status at December 31, 2017 and 2016 were:
|  | 2017 |  | 2016
Discount rate |  |  | 3.71 | % |  |  | 4.35 | %
Rate of compensation increase |  |  | — |  |  |  | 4.00 | %
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] | The following is a reconciliation of the change in benefit obligation and plan assets of both the defined benefit pension plan and the unfunded supplemental pension plan for the years ended December 31, 2017 and 2016:
|  | Defined Benefit Pension Plan |  | Supplemental Pension Plan
|  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (Dollars in thousands)
Change in projected benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation, beginning of year |  | $ | 45,079 |  |  | $ | 48,677 |  |  | $ | 15,409 |  |  | $ | 14,261 |
Service cost |  |  | 378 |  |  |  | 1,328 |  |  |  | 185 |  |  |  | 310 |
Interest cost |  |  | 1,616 |  |  |  | 1,833 |  |  |  | 591 |  |  |  | 616 |
Plan curtailment |  |  | — |  |  |  | (5,098 | ) |  |  | — |  |  |  | (919 | )
Actuarial loss |  |  | 4,423 |  |  |  | 2,282 |  |  |  | 1,519 |  |  |  | 1,527 |
Benefits paid |  |  | (2,121 | ) |  |  | (3,943 | ) |  |  | (528 | ) |  |  | (386 | )
Projected benefit obligation, end of year |  | $ | 49,375 |  |  | $ | 45,079 |  |  | $ | 17,176 |  |  | $ | 15,409 |
Change in plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets, beginning of year |  |  | 32,278 |  |  |  | 32,345 |  |  |  | — |  |  |  | — |
Actual return on plan assets |  |  | 4,590 |  |  |  | 1,791 |  |  |  | — |  |  |  | — |
Administrative expenses |  |  | (378 | ) |  |  | (315 | ) |  |  | — |  |  |  | — |
Contributions |  |  | 4,000 |  |  |  | 2,400 |  |  |  | 528 |  |  |  | 386 |
Benefits paid |  |  | (2,121 | ) |  |  | (3,943 | ) |  |  | (528 | ) |  |  | (386 | )
Fair value of plan assets, end of year |  | $ | 38,369 |  |  | $ | 32,278 |  |  | $ | — |  |  | $ | — |
Funded status of plan |  | $ | (11,006 | ) |  | $ | (12,801 | ) |  | $ | (17,176 | ) |  | $ | (15,409 | )
Amounts recognized in the consolidated balance sheets consist of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities – other |  | $ | — |  |  | $ | — |  |  | $ | (416 | ) |  | $ | (409 | )
Long-term pension liability |  |  | (11,006 | ) |  |  | (12,801 | ) |  |  | (16,760 | ) |  |  | (15,000 | )
Net amount recognized |  | $ | (11,006 | ) |  | $ | (12,801 | ) |  | $ | (17,176 | ) |  | $ | (15,409 | )
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated loss, net of income tax benefit of $5,904, $5,373, $2,166 and $1,802, respectively |  | $ | 9,916 |  |  | $ | 8,403 |  |  | $ | 3,854 |  |  | $ | 2,820 |
Prior service cost, net of income tax liability of $0, $0, ($75) and ($91), respectively |  |  | — |  |  |  | — |  |  |  | (97 | ) |  |  | (143 | )
Net amount recognized |  | $ | 9,916 |  |  | $ | 8,403 |  |  | $ | 3,757 |  |  | $ | 2,677 |
Schedule of Assumptions Used [Table Text Block] | Assumptions used in determining net periodic pension cost for the years ended December 31, 2017, 2016 and 2015 were:
|  | Defined Benefit Pension Plan |  | Supplemental Pension Plan
|  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Discount rate for determining projected benefit obligation |  |  | 4.33 | % |  |  | 4.60 | % |  |  | 4.17 | % |  |  | 4.41 | % |  |  | 4.67 | % |  |  | 4.17 | %
Discount rate in effect for determining service cost |  |  | — |  |  |  | 4.81 | % |  |  | 4.17 | % |  |  | 4.62 | % |  |  | 4.84 | % |  |  | 4.17 | %
Discount rate in effect for determining interest cost |  |  | 3.63 | % |  |  | 3.93 | % |  |  | 4.17 | % |  |  | 3.92 | % |  |  | 4.18 | % |  |  | 4.17 | %
Rate of compensation increase |  |  | — |  |  |  | 4.00 | % |  |  | 4.00 | % |  |  | — |  |  |  | 4.00 | % |  |  | 4.00 | %
Long-term rate of return on plan assets |  |  | 7.00 | % |  |  | 7.50 | % |  |  | 7.50 | % |  |  | — |  |  |  | — |  |  |  | — |
Schedule of Net Benefit Costs [Table Text Block] | The components of net periodic pension cost for the years ended December 31, 2017, 2016 and 2015, were:
|  | 2017 |  | 2016 |  | 2015
|  | (Dollars in thousands)
Service cost |  | $ | 563 |  |  | $ | 1,638 |  |  | $ | 1,636 |
Interest cost |  |  | 2,207 |  |  |  | 2,449 |  |  |  | 2,665 |
Expected return on plan assets |  |  | (2,301 | ) |  |  | (2,430 | ) |  |  | (2,364 | )
Net amortization and deferral |  |  | 526 |  |  |  | 1,527 |  |  |  | 1,762 |
Net periodic pension cost(1) |  | $ | 995 |  |  | $ | 3,184 |  |  | $ | 3,699 |
| (1) | The decrease in net periodic pension cost in 2017 was a result of freezing benefit accruals under the plan, effective December 31, 2016.
Schedule of Expected Benefit Payments [Table Text Block] | Projected benefit payments for the plans as of December 31, 2017, were estimated as follows:
|  | Defined Benefit Pension Plan |  | Supplemental Pension Plan
|  | (Dollars in thousands)
2018 |  | $ | 2,512 |  |  | $ | 416 |
2019 |  | $ | 2,651 |  |  | $ | 450 |
2020 |  | $ | 2,678 |  |  | $ | 485 |
2021 |  | $ | 2,695 |  |  | $ | 520 |
2022 |  | $ | 2,686 |  |  | $ | 566 |
2023 – 2027 |  | $ | 13,901 |  |  | $ | 4,383 |
Schedule of Allocation of Plan Assets [Table Text Block] | The following table summarizes the fair value of the Company’s pension plan assets as of December 31, 2017, by asset category within the fair value hierarchy (for further level information, see Note 3):
|  | December 31, 2017
|  | Quoted Prices in Active Markets Level 1 |  | Significant Observable Inputs Level 2 |  | Significant Unobservable Inputs Level 3 |  | Total
|  | (Dollars in thousands)
Common stocks |  | $ | 13,855 |  |  | $ | 1,628 |  |  | $ | — |  |  | $ | 15,483 |
Preferred stocks |  |  | 290 |  |  |  | 57 |  |  |  | — |  |  |  | 347 |
Exchange traded funds |  |  | 5,546 |  |  |  | — |  |  |  | — |  |  |  | 5,546 |
Corporate obligations |  |  | — |  |  |  | 5,867 |  |  |  | — |  |  |  | 5,867 |
State and municipal obligations |  |  | — |  |  |  | 1,313 |  |  |  | — |  |  |  | 1,313 |
Pooled fixed income funds |  |  | 6,895 |  |  |  | — |  |  |  | — |  |  |  | 6,895 |
U.S. government securities |  |  | — |  |  |  | 381 |  |  |  | — |  |  |  | 381 |
Cash and cash equivalents |  |  | 2,444 |  |  |  | — |  |  |  | — |  |  |  | 2,444 |
Subtotal |  | $ | 29,030 |  |  | $ | 9,246 |  |  | $ | — |  |  | $ | 38,276 |
Other assets(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 38,369 |
| (1) | This category represents trust receivables that are not leveled.
The following table summarizes the fair value of the Company’s pension plan assets as of December 31, 2016, by asset category within the fair value hierarchy (for further level information, see Note 3):
|  | December 31, 2016
|  | Quoted Prices in Active Markets Level 1 |  | Significant Observable Inputs Level 2 |  | Significant Unobservable Inputs Level 3 |  | Total
|  | (Dollars in thousands)
Common stocks |  | $ | 12,656 |  |  | $ | 970 |  |  | $ | — |  |  | $ | 13,626 |
Preferred stocks |  |  | 227 |  |  |  | 17 |  |  |  | — |  |  |  | 244 |
Exchange traded funds |  |  | 3,742 |  |  |  | — |  |  |  | — |  |  |  | 3,742 |
Corporate obligations |  |  | — |  |  |  | 5,113 |  |  |  | — |  |  |  | 5,113 |
State and municipal obligations |  |  | — |  |  |  | 1,538 |  |  |  | — |  |  |  | 1,538 |
Pooled fixed income funds |  |  | 4,345 |  |  |  | — |  |  |  | — |  |  |  | 4,345 |
U.S. government securities |  |  | — |  |  |  | 1,061 |  |  |  | — |  |  |  | 1,061 |
Cash and cash equivalents |  |  | 2,519 |  |  |  | — |  |  |  | — |  |  |  | 2,519 |
Subtotal |  | $ | 23,489 |  |  | $ | 8,699 |  |  | $ | — |  |  | $ | 32,188 |
Other assets(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 32,278 |
| (1) | This category represents trust receivables that are not leveled.

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