Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Projected Benefit Obligations, Fair Value of Plan Assets and Unfunded Status

The following table presents the plans’ projected benefit obligations, fair value of plan assets and unfunded status:

(Dollars in thousands)	Qualified Pension Plan						Non-Qualified Retirement Plans
At December 31,	2015			2014			2015			2014
Change in Benefit Obligation:
Benefit obligation at beginning of period		$73,149			$61,162			$13,097			$10,784
Service cost	2,459			2,152			78			46
Interest cost	2,928			2,891			490			478
Actuarial (gain) loss	(5,410		)	11,081			88			2,546
Benefits paid	(5,430		)	(3,981		)	(738		)	(757		)
Administrative expenses	(146		)	(156		)	—			—
Benefit obligation at end of period	67,550			73,149			13,015			13,097
Change in Plan Assets:
Fair value of plan assets at beginning of period	67,613			62,060			—			—
Actual return on plan assets	673			3,690			—			—
Employer contributions	3,000			6,000			738			757
Benefits paid	(5,430		)	(3,981		)	(738		)	(757		)
Administrative expenses	(146		)	(156		)	—			—
Fair value of plan assets at end of period	65,710			67,613			—			—
Unfunded status at end of period		($1,840	)		($5,536	)		($13,015	)		($13,097	)

Schedule of Components of Accumulated Other Comprehensive Income (Loss) Related to Retirements Plans

The following table presents components of accumulated other comprehensive income related to the qualified pension plan and non-qualified retirement plans, on a pre-tax basis:

(Dollars in thousands)	Qualified Pension Plan						Non-Qualified Retirement Plans
At December 31,	2015			2014			2015			2014
Net actuarial loss		$12,688			$15,504			$4,392			$4,548
Prior service credit	(84		)	(107		)	(2		)	(3		)
Total pre-tax amounts recognized in accumulated other comprehensive income		$12,604			$15,397			$4,390			$4,545

Schedule of Net Periodic Benefit Costs and Other Amounts Recognized in Other Comprehensive Income (Loss)

The following table presents components of net periodic benefit cost and other amounts recognized in other comprehensive income (loss), on a pre-tax basis:

(Dollars in thousands)	Qualified Pension Plan									Non-Qualified Retirement Plans
Years ended December 31,	2015			2014			2013			2015			2014			2013
Net Periodic Benefit Cost:
Service cost		$2,459			$2,152			$2,720			$78			$46			$181
Interest cost	2,928			2,891			2,883			490			478			462
Expected return on plan assets	(4,515		)	(4,063		)	(3,725		)	—			—			—
Amortization of prior service credit	(23		)	(23		)	(30		)	(1		)	(1		)	(1		)
Recognized net actuarial loss	1,249			461			1,321			245			70			175
Curtailments	—			—			(61		)	—			—			(1		)
Net periodic benefit cost	2,098			1,418			3,108			812			593			816
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (on a pre-tax basis):
Net (gain) loss	(2,816		)	10,993			(14,572		)	(156		)	2,476			(1,506		)
Prior service cost	23			23			30			1			1			1
Curtailments	—			—			(4,000		)	—			—			(359		)
Recognized in other comprehensive (loss) income	(2,793		)	11,016			(18,542		)	(155		)	2,477			(1,864		)
Total recognized in net periodic benefit cost and other comprehensive (loss) income		($695	)		$12,434			($15,434	)		$657			$3,070			($1,048	)

Schedule of Assumptions Used

The following table presents the measurement date and weighted-average assumptions used to determine benefit obligations at December 31, 2015 and 2014:

	Qualified Pension Plan		Non-Qualified Retirement Plans
	2015	2014	2015	2014
Measurement date	Dec 31, 2015	Dec 31, 2014	Dec 31, 2015	Dec 31, 2014
Discount rate	4.480%	4.125%	4.200%	3.900%
Rate of compensation increase	3.750	3.750	3.750	3.750

The following table presents the measurement date and weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31, 2015, 2014 and 2013:

	Qualified Pension Plan			Non-Qualified Retirement Plans
	2015	2014	2013	2015	2014	2013
Measurement date	Dec 31, 2014	Dec 31, 2013	Dec 31, 2012	Dec 31, 2014	Dec 31, 2013	Dec 31, 2012
Discount rate	4.125%	4.875%	4.125%	3.900%	4.600%	3.800%
Expected long-term return on plan assets	7.250	7.250	7.250	—	—	—
Rate of compensation increase	3.750	3.750	3.750	3.750	3.750	3.750

Schedule of Fair Value and Allocation of Plan Assets

The following table present the asset allocations of the qualified pension plan, by asset category:

December 31,	2015		2014
Asset Category:
Equity securities	63.4	%	61.6	%
Fixed income securities	34.6		37.8
Cash and cash equivalents	2.0		0.6
Total	100.0	%	100.0	%

The following tables present the fair values of the qualified pension plan’s assets:

(Dollars in thousands)
	Fair Value Measurements Using						Assets at Fair Value
December 31, 2015	Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents		$1,598		$—		$—		$1,598
Obligations of U.S. government agencies and U.S. government-sponsored enterprises	—		3,306		—		3,306
Obligations of states and political subdivisions	—		3,438		—		3,438
Corporate bonds	—		12,955		—		12,955
Common stocks	29,433		—		—		29,433
Mutual funds	14,980		—		—		14,980
Total plan assets		$46,011		$19,699		$—		$65,710

(Dollars in thousands)
	Fair Value Measurements Using						Assets at Fair Value
December 31, 2014	Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents		$637		$—		$—		$637
Obligations of U.S. government agencies and U.S. government-sponsored enterprises	—		4,197		—		4,197
Obligations of states and political subdivisions	—		2,953		—		2,953
Corporate bonds	—		13,162		—		13,162
Common stocks	31,172		—		—		31,172
Mutual funds	15,492		—		—		15,492
Total plan assets		$47,301		$20,312		$—		$67,613

Schedule of Expected Future Benefit Payments

The following table presents the benefit payments, which reflect expected future service, as appropriate, expected to be paid:

(Dollars in thousands)	Qualified Pension Plan		Non-Qualified Plans
2016		$4,401		$788
2017	2,992		782
2018	3,222		775
2019	3,032		804
2020	3,896		896
Years 2021 - 2025	21,768		4,304