RETIREMENT PLANS: (Tables)

12 Months Ended

Dec. 31, 2015

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)	2015			2014			2013
Service cost - benefits earned	$	2,153		$	2,040		$	2,238
Interest cost on projected benefit obligation	3,516			3,756			3,383
Loss due to settlement	—			2,676			—
Expected return on plan assets	(3,452		)	(3,794		)	(3,309		)
Net amortization and deferral	2,065			750			2,075
Net periodic pension cost	4,282			5,428			4,387
Net loss (gain) during the period	(1,894		)	23,111			(14,697		)
Adjustment to loss due to settlement	—			(2,676		)	—
Settlement	—			(7,148		)	—
Amortization of prior service cost	(1		)	9			16
Amortization of unrecognized gain (loss)	(2,064		)	(759		)	(2,091		)
Total recognized in other comprehensive (income) loss	(3,959		)	12,537			(16,772		)
Total recognized net periodic pension cost and other comprehensive income	$	323		$	17,965		$	(12,385	)

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)	2015			2014
Change in benefit obligation:
Benefit obligation at January 1	$	98,135		$	81,469
Service cost	2,153			2,040
Interest cost	3,516			3,756
Actuarial (gain) loss	(8,802		)	22,274
Settlement	—			(7,148		)
Benefits paid	(4,147		)	(4,256		)
Benefit obligation at December 31	90,855			98,135
Reconciliation of fair value of plan assets:
Fair value of plan assets at January 1	62,565			67,233
Actual return on plan assets	(205		)	2,957
Employer contributions	2,389			3,779
Settlement	—			(7,148		)
Benefits paid	(4,147		)	(4,256		)
Fair value of plan assets at December 31	60,602			62,565
Funded status at December 31 (plan assets less benefit obligation)	$	(30,253	)	$	(35,570	)

Schedule of Assumptions Used

The accumulated benefit obligation for the defined benefit pension plan was $85.1 million and $91.5 million at year-end

2015 and 2014.

Principal assumptions used to determine pension benefit obligation at year end:	2015		2014
Discount rate	4.34	%	3.95	%
Rate of increase in compensation levels	3.00		3.00

Principal assumptions used to determine net periodic pension cost:	2015		2014
Discount rate	3.95	%	4.95	%
Rate of increase in compensation levels	3.00		3.50
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 2015 and 2014 by asset category are as follows:

	Pension Plan Target Allocation	ESOP Target Allocation	Pension Pecentage of Plan Assets at December 31,				ESOP Pecentage of Plan Assets at December 31,
ASSET CATEGORY	2015	2015	2015		2014		2015		2014
Equity securities	40-65%	95-99%	63	%	59	%	100	%	99	%
Debt securities	35-60%	0-0%	35	%	38	%	—	%	—	%
Other	0-10%	0-5%	2	%	3	%	—	%	1	%
TOTAL			100	%	100	%	100	%	100	%

Schedule Of Fair Value Of Plan Assets

The fair value of the plan assets at December 31, 2015 and 2014, by asset category, is as follows:

			Fair Value Measurments at December 31, 2015 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	$	44,052	$	44,052	$	—	$	—
Debt securities	14,264		—		14,264		—
Investment Funds	2,286		2,286		—		—
Total plan assets	$	60,602	$	46,338	$	14,264	$	—

			Fair Value Measurments at December 31, 2014 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	$	44,732	$	44,732	$	—	$	—
Debt securities	15,245		—		15,245		—
Investment Funds	2,588		2,588		—		—
Total plan assets	$	62,565	$	47,320	$	15,245	$	—

Schedule of Expected Benefit Payments

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

PENSION BENEFITS
(Dollar amounts in thousands)
2016	$	4,752
2017	4,879
2018	5,000
2019	5,281
2020	5,428
2021-2025	30,078

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

(Dollar amounts in thousands)
2016	$	262
2017	268
2018	267
2019	269
2020	275
2021-2025	1,387

Schedule Of Weighted Average Assumptions

Weighted average assumptions at December 31:

	December 31,
	2015		2014
Discount rate	4.34	%	3.95	%
Initial weighted health care cost trend rate	5.00	%	7.50	%
Ultimate health care cost trend rate	5.00		5.00
Year that the rate is assumed to stabilize and remain unchanged	2015		2015

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	$	2	$	1
Effect on post-retirement benefit obligation	37		34

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, 2015 and 2014 consist of:

(Dollar amounts in thousands)	2015		2014
Net loss (gain)	$	33,502	$	29,544
Prior service cost (credit)	6		5
	$	33,508	$	29,549

Postretirement Health Coverage [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

Post-retirement health benefit expense included the following components:

	Years Ended December 31,
(Dollar amounts in thousands)	2015			2014		2013
Service cost	$	63		$	53	$	68
Interest cost	173			175		173
Amortization of transition obligation	—			—		60
Recognized actuarial loss	—			—		—
Net periodic benefit cost	236			228		301
Net loss (gain) during the period	(200		)	456		(338		)
Amortization of prior service cost	—			—		(59		)
Total recognized in other comprehensive income (loss)	(200		)	456		(397		)
Total recognized net periodic benefit cost and other comprehensive income	$	36		$	684	$	(96	)

The Corporation uses a measurement date of December 31. Accrued post-retirement benefits as of December 31, 2015 and 2014 are as follows:

	December 31,
(Dollar amounts in thousands)	2015			2014
Change in benefit obligation:
Benefit obligation at January 1	$	4,559		$	4,088
Service cost	63			53
Interest cost	173			175
Plan participants' contributions	57			39
Actuarial (gain) loss	(200		)	456
Benefits paid	(269		)	(252		)
Benefit obligation at December 31	$	4,383		$	4,559
Funded status at December 31	$	4,383		$	4,559

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)	2015			2014			2013
Net loss (gain) during the period	$	(255	)	$	932		$	(333	)
Amortization of prior service cost	—			—			—
Amortization of unrecognized gain (loss)	(88		)	(7		)	(68		)
Total recognized in other comprehensive (income) loss	$	(343	)	$	925		$	(401	)

Schedule of Expected Benefit Payments

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

(Dollar amounts on thousands)
2016	$	—
2017	315
2018	320
2019	325
2020	331
2021-2025	1,762