Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

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

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

(Dollars in thousands)	Qualified Pension Plan						Non-Qualified Retirement Plans
At December 31,	2016			2015			2016			2015
Change in Benefit Obligation:
Benefit obligation at beginning of period		$67,550			$73,149			$13,015			$13,097
Service cost	2,148			2,459			122			78
Interest cost	2,576			2,928			432			490
Actuarial (gain) loss	3,888			(5,410		)	374			88
Benefits paid	(3,072		)	(5,430		)	(789		)	(738		)
Administrative expenses	(139		)	(146		)	—			—
Benefit obligation at end of period	72,951			67,550			13,154			13,015
Change in Plan Assets:
Fair value of plan assets at beginning of period	65,710			67,613			—			—
Actual return on plan assets	4,788			673			—			—
Employer contributions	8,500			3,000			789			738
Benefits paid	(3,072		)	(5,430		)	(789		)	(738		)
Administrative expenses	(139		)	(146		)	—			—
Fair value of plan assets at end of period	75,787			65,710			—			—
Funded (unfunded) status at end of period		$2,836			($1,840	)		($13,154	)		($13,015	)

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,	2016			2015			2016			2015
Net actuarial loss		$15,593			$12,688			$4,519			$4,392
Prior service credit	(62		)	(84		)	(1		)	(2		)
Total pre-tax amounts recognized in accumulated other comprehensive income		$15,531			$12,604			$4,518			$4,390

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,	2016			2015			2014			2016			2015			2014
Net Periodic Benefit Cost:
Service cost		$2,148			$2,459			$2,152			$122			$78			$46
Interest cost	2,576			2,928			2,891			432			490			478
Expected return on plan assets	(4,633		)	(4,515		)	(4,063		)	—			—			—
Amortization of prior service credit	(23		)	(23		)	(23		)	(1		)	(1		)	(1		)
Recognized net actuarial loss	828			1,249			461			247			245			70
Net periodic benefit cost	896			2,098			1,418			800			812			593
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (on a pre-tax basis):
Net (gain) loss	2,904			(2,816		)	10,993			127			(156		)	2,476
Prior service cost	23			23			23			1			1			1
Recognized in other comprehensive (loss) income	2,927			(2,793		)	11,016			128			(155		)	2,477
Total recognized in net periodic benefit cost and other comprehensive (loss) income		$3,823			($695	)		$12,434			$928			$657			$3,070

Schedule of Assumptions Used for Net Periodic Benefit Cost

The following table presents the measurement date and weighted-average assumptions used to determine benefit obligations at December 31, 2016 and 2015:

	Qualified Pension Plan		Non-Qualified Retirement Plans
	2016	2015	2016	2015
Measurement date	Dec 31, 2016	Dec 31, 2015	Dec 31, 2016	Dec 31, 2015
Discount rate	4.18%	4.48%	4.00%	4.20%
Rate of compensation increase	3.75	3.75	3.75	3.75

The following table presents the measurement date and weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31, 2016, 2015 and 2014:

	Qualified Pension Plan			Non-Qualified Retirement Plans
	2016	2015	2014	2016	2015	2014
Measurement date	Dec 31, 2015	Dec 31, 2014	Dec 31, 2013	Dec 31, 2015	Dec 31, 2014	Dec 31, 2013
Discount rate	N/A	4.125%	4.875%	N/A	3.90%	4.60%
Equivalent single discount rate for benefit obligations	4.48%	N/A	N/A	4.20%	N/A	N/A
Equivalent single discount rate for service cost	4.63	N/A	N/A	4.59	N/A	N/A
Equivalent single discount rate for interest cost	3.88	N/A	N/A	3.44	N/A	N/A
Expected long-term return on plan assets	6.75	7.25	7.25	N/A	N/A	N/A
Rate of compensation increase	3.75	3.75	3.75	3.75	3.75	3.75

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,	2016		2015
Asset Category:
Equity securities	63.8	%	63.4	%
Fixed income securities	32.4		34.6
Cash and cash equivalents	3.8		2.0
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, 2016	Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents		$2,880		$—		$—		$2,880
Obligations of U.S. government agencies and U.S. government-sponsored enterprises	—		4,233		—		4,233
Obligations of states and political subdivisions	—		3,418		—		3,418
Corporate bonds	—		13,775		—		13,775
Common stocks	33,893		—		—		33,893
Mutual funds	17,588		—		—		17,588
Total plan assets		$54,361		$21,426		$—		$75,787

(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

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
2017		$3,709		$779
2018	3,064		772
2019	3,169		801
2020	3,991		895
2021	3,682		881
Years 2022 - 2026	24,864		4,248