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RETIREMENT PLANS: (Tables)

12 Months Ended

Dec. 31, 2018

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

Net periodic benefit cost and other amounts recognized in other comprehensive income included the following components:

(Dollar amounts in thousands)		2018				2017				2016
Service cost - benefits earned		$	1,388			$	1,432			$	1,882
Interest cost on projected benefit obligation		3,194				3,621				3,729
Expected return on plan assets		(3,962		)		(3,940		)		(3,429		)
Net amortization and deferral		1,448				1,205				1,936
Net periodic pension cost		2,068				2,318				4,118
Net loss (gain) during the period		(1,192		)		5,366				(6,150		)
Amortization of prior service cost		(1		)		(1		)		(1		)
Amortization of unrecognized gain (loss)		(1,447		)		(1,204		)		(1,935		)
Total recognized in other comprehensive (income) loss		(2,640		)		4,161				(8,086		)
Total recognized net periodic pension cost and other comprehensive income		$	(572	)		$	6,479			$	(3,968	)

Schedule of Defined Benefit Plans Disclosures

The information below sets forth the change in projected benefit obligation, reconciliation of plan assets, and the funded status of the Corporation's retirement program. Actuarial present value of benefits is based on service to date and present pay levels.

(Dollar amounts in thousands)		2018				2017
Change in benefit obligation:
Benefit obligation at January 1		$	98,096			$	93,233
Service cost		1,388				1,432
Interest cost		3,194				3,621
Actuarial (gain) loss		(10,618		)		5,305
Benefits paid		(4,264		)		(5,495		)
Benefit obligation at December 31		87,796				98,096
Reconciliation of fair value of plan assets:
Fair value of plan assets at January 1		71,449				70,132
Actual return on plan assets		(5,464		)		3,879
Employer contributions		2,614				2,933
Benefits paid		(4,264		)		(5,495		)
Fair value of plan assets at December 31		64,335				71,449
Funded status at December 31 (plan assets less benefit obligation)		$	(23,461	)		$	(26,647	)

Schedule of Assumptions Used

The accumulated benefit obligation for the defined benefit pension plan was $83.9 million and $93.3 million at year-end

2018 and 2017.

Principal assumptions used to determine pension benefit obligation at year end:		2018			2017
Discount rate		4.22	%		3.60	%
Rate of increase in compensation levels		3.00			3.00

Principal assumptions used to determine net periodic pension cost:		2018			2017
Discount rate		3.60	%		4.14	%
Rate of increase in compensation levels		3.00			3.00
Expected long-term rate of return on plan assets		6.00			6.00

Schedule of Allocation of Plan Assets

The Corporation's pension plan weighted-average asset allocation for the years 2018 and 2017 by asset category are as follows:

		Pension Plan Target Allocation		ESOP Target Allocation		Pension Percentage of Plan Assets at December 31,						ESOP Percentage of Plan Assets at December 31,
ASSET CATEGORY		2018		2018		2018			2017			2018			2017
Equity securities		25-75%		95-99%		65	%		72	%		99	%		98	%
Debt securities		0-50%		0-0%		31	%		25	%		—	%		—	%
Other		0-20%		0-5%		4	%		3	%		1	%		2	%
TOTAL						100	%		100	%		100	%		100	%

Schedule Of Fair Value Of Plan Assets

The fair value of the plan assets at December 31, 2018 and 2017, by asset category, is as follows:

						Fair Value Measurements at December 31, 2018 Using:
						Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs				Significant Observable Inputs
(Dollar amounts in thousands)		Total				(Level 1)				(Level 2)				(Level 3)
Plan assets
Equity securities		$	43,931			$	43,931			$	—			$	—
Debt securities		10,652				—				10,652				—
Investment Funds		9,752				9,752				—				—
Total plan assets		$	64,335			$	53,683			$	10,652			$	—

						Fair Value Measurements at December 31, 2017 Using:
						Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs				Significant Observable Inputs
(Dollar amounts in thousands)		Total				(Level 1)				(Level 2)				(Level 3)
Plan assets
Equity securities		$	48,152			$	48,152			$	—			$	—
Debt securities		10,717				—				10,717				—
Investment Funds		12,580				12,580				—				—
Total plan assets		$	71,449			$	60,732			$	10,717			$	—

Schedule of Expected Benefit Payments

Estimated Future Payments — The following benefit payments, which reflect expected future service, are expected:

(Dollar amounts in thousands)
2019	$	233
2020	233
2021	228
2022	228
2023	230
2024-2028	1,119

Estimated Future Payments — The following benefit payments, which reflect expected future service, are expected:

PENSION BENEFITS
(Dollar amounts in thousands)
2019	$	4,692
2020	4,843
2021	5,034
2022	5,221
2023	5,391
2024-2028	28,701

Schedule Of Weighted Average Assumptions

Weighted average assumptions at December 31:

		December 31,
		2018			2017
Discount rate		4.22	%		3.60	%
Initial weighted health care cost trend rate		5.00	%		5.00	%
Ultimate health care cost trend rate		5.00			5.00
Year that the rate is assumed to stabilize and remain unchanged		2019			2018

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates

A one-percentage-point change in the assumed health care cost trend rates would have the following effects:

		1% Point				1% Point
(Dollar amounts in thousands)		Increase				Decrease
Effect on total of service and interest cost components		$	1			$	1
Effect on post-retirement benefit obligation		16				15

Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

Amounts recognized in accumulated other comprehensive income at December 31, 2018 and 2017 consist of:

(Dollar amounts in thousands)		2018				2017
Net loss (gain)		$	22,982			$	25,621
Prior service cost (credit)		2				3
		$	22,984			$	25,624

Postretirement Health Coverage [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

The Corporation uses a measurement date of December 31. Accrued post-retirement benefits as of December 31, 2018 and 2017 are as follows:

		December 31,
(Dollar amounts in thousands)		2018				2017
Change in benefit obligation:
Benefit obligation at January 1		$	4,361			$	4,276
Service cost		42				53
Interest cost		131				172
Plan participants' contributions		83				75
Actuarial (gain) loss		(872		)		83
Benefits paid		(325		)		(298		)
Benefit obligation at December 31		$	3,420			$	4,361
Funded status at December 31		$	3,420			$	4,361

Post-retirement health benefit expense included the following components:

		Years Ended December 31,
(Dollar amounts in thousands)		2018				2017				2016
Service cost		$	42			$	53			$	55
Interest cost		131				172				186
Net periodic benefit cost		173				225				241
Net loss (gain) during the period		(872		)		83				(144		)
Total recognized in other comprehensive income (loss)		(872		)		83				(144		)
Total recognized net periodic benefit cost and other comprehensive income		$	(699	)		$	308			$	97

Supplemental Employee Retirement Plans, Defined Benefit

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

The amounts recognized in other comprehensive income in the current year are as follows:

(Dollar amounts in thousands)		2018				2017				2016
Net loss (gain) during the period		$	260			$	527			$	(511	)
Amortization of prior service cost		—				—				—
Amortization of unrecognized gain (loss)		(51		)		—				(57		)
Total recognized in other comprehensive (income) loss		$	209			$	527			$	(568	)

Schedule of Expected Benefit Payments

Estimated Future Payments — The following benefit payments, which reflect expected future service, are expected:

(Dollar amounts on thousands)
2019	$	—
2020	199
2021	388
2022	379
2023	368
2024-2028	1,994

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