RETIREMENT PLANS: (Tables)

12 Months Ended

Dec. 31, 2014

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)	2014			2013			2012
Service cost - benefits earned	$	2,040		$	2,238		$	4,872
Interest cost on projected benefit obligation	3,756			3,383			3,667
Loss due to settlement	2,676			—			—
Expected return on plan assets	(3,794		)	(3,309		)	(3,258		)
Net amortization and deferral	750			2,075			2,434
Net periodic pension cost	5,428			4,387			7,715
Net loss (gain) during the period	23,111			(14,697		)	3,842
Adjustment to loss due to settlement	(2,676		)	—			—
Settlement	(7,148		)	—			—
Curtailment gain	—			—			(5,700		)
Amortization of prior service cost	9			16			(166		)
Amortization of unrecognized gain (loss)	(759		)	(2,091		)	(2,270		)
Total recognized in other comprehensive (income) loss	12,537			(16,772		)	(4,294		)
Total recognized net periodic pension cost and other comprehensive income	$	17,965		$	(12,385	)	$	3,421

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)	2014			2013
Change in benefit obligation:
Benefit obligation at January 1	$	81,469		$	86,807
Service cost	2,040			2,238
Interest cost	3,756			3,383
Actuarial (gain) loss	22,274			(7,098		)
Settlement	(7,148		)	—
Benefits paid	(4,256		)	(3,861		)
Benefit obligation at December 31	98,135			81,469
Reconciliation of fair value of plan assets:
Fair value of plan assets at January 1	67,233			57,491
Actual return on plan assets	2,957			10,909
Employer contributions	3,779			2,694
Settlement	(7,148		)	—
Benefits paid	(4,256		)	(3,861		)
Fair value of plan assets at December 31	62,565			67,233
Funded status at December 31 (plan assets less benefit obligation)	$	(35,570	)	$	(14,236	)

Schedule of Assumptions Used

The accumulated benefit obligation for the defined benefit pension plan was $91.5 million and $75.7 million at year-end

2014 and 2013.

Principal assumptions used to determine pension benefit obligation at year end:	2014		2013
Discount rate	3.95	%	4.95	%
Rate of increase in compensation levels	3.00		3.50

Principal assumptions used to determine net periodic pension cost:	2014		2013
Discount rate	4.95	%	4.05	%
Rate of increase in compensation levels	3.50		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 2014 and 2013 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	2014	2014	2014		2013		2014		2013
Equity securities	40-65%	95-99%	59	%	64	%	99	%	99	%
Debt securities	35-60%	0-0%	38	%	34	%	—	%	—	%
Other	0-10%	0-5%	3	%	2	%	1	%	1	%
TOTAL			100	%	100	%	100	%	100	%

Schedule Of Fair Value Of Plan Assets

The fair value of the plan assets at December 31, 2014 and 2013, by asset category, is as follows:

			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	$	—

			Fair Value Measurments at December 31, 2013 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	$	53,112	$	53,112	$	—	$	—
Debt securities	12,015		—		12,015		—
Investment Funds	2,106		2,106		—		—
Total plan assets	$	67,233	$	55,218	$	12,015	$	—

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)
2015	$	4,730
2016	4,891
2017	5,022
2018	5,143
2019	5,403
2020-2024	29,658

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

(Dollar amounts in thousands)
2015	$	247
2016	262
2017	266
2018	266
2019	267
2020-2024	1,378

Schedule Of Weighted Average Assumptions

Weighted average assumptions at December 31:

	December 31,
	2014		2013
Discount rate	3.95	%	4.95	%
Initial weighted health care cost trend rate	7.50		7.50
Ultimate health care cost trend rate	5.00		5.00
Year that the rate is assumed to stabilize and remain unchanged	2015		2016

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	39		35

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, 2014 and 2013 consist of:

(Dollar amounts in thousands)	2014		2013
Net loss (gain)	$	23,111	$	(14,697	)
Prior service cost (credit)	9		16
	$	23,120	$	(14,681	)

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, 2014 and 2013 are as follows:

	December 31,
(Dollar amounts in thousands)	2014			2013
Change in benefit obligation:
Benefit obligation at January 1	$	4,088		$	4,395
Service cost	53			68
Interest cost	175			173
Plan participants' contributions	39			37
Actuarial (gain) loss	456			(338		)
Benefits paid	(252		)	(247		)
Benefit obligation at December 31	$	4,559		$	4,088
Funded status at December 31	$	4,559		$	4,088

Post-retirement health benefit expense included the following components:

	Years Ended December 31,
(Dollar amounts in thousands)	2014		2013			2012
Service cost	$	53	$	68		$	60
Interest cost	175		173			173
Amortization of transition obligation	—		60			60
Recognized actuarial loss	—		—			—
Net periodic benefit cost	228		301			293
Net loss (gain) during the period	456		(338		)	311
Amortization of prior service cost	—		(59		)	(60		)
Total recognized in other comprehensive income (loss)	456		(397		)	251
Total recognized net periodic benefit cost and other comprehensive income	$	684	$	(96	)	$	544

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)	2014			2013			2012
Net loss (gain) during the period	$	932		$	(333	)	$	442
Amortization of prior service cost	—			—			—
Amortization of unrecognized gain (loss)	(7		)	(68		)	(79		)
Total recognized in other comprehensive (income) loss	$	925		$	(401	)	$	363

Schedule of Expected Benefit Payments

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

(Dollar amounts on thousands)
2015	$	—
2016	293
2017	289
2018	284
2019	280
2020-2024	1,316