Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Fair Value of Plan Assets and Major Categories

The fair value of plan assets and major categories as of December 31, 2016, is as follows:

Asset Category	Percent			Total		Level 1		Level 2		Level 3
(dollars in thousands)
Collective fund		59.3	%	$	22,209	$	4,708	$	17,501	$	—
Equity securities		19.7	%		7,363		7,363		—		—
Mutual funds		12.3	%		4,615		4,615		—		—
Hedge funds		7.4	%		2,786		—		—		2,786
Short-term investments		1.3	%		474		474		—		—
		100.0	%	$	37,447	$	17,160	$	17,501	$	2,786

The fair value of plan assets and major categories as of December 31, 2015, is as follows:

Asset Category	Percent			Total		Level 1		Level 2		Level 3
(dollars in thousands)
Collective fund		61.20	%	$	20,627	$	4,307	$	16,320	$	—
Equity securities		17.70	%		5,990		5,990		—		—
Mutual funds		11.90	%		4,001		4,001		—		—
Hedge funds		7.50	%		2,524		—		—		2,524
Short-term investments		1.70	%		575		575		—		—
		100.00	%	$	33,717	$	14,873	$	16,320	$	2,524

Changes in Level 3 Securities

The changes in Level 3 securities are shown in the table below:

Year Ended December 31,	2016			2015
(dollars in thousands)
Balance at beginning of year	$	2,524		$	2,360
Purchases		114			224
Redemptions		(309	)		(40	)
Actual return – assets still being held		457			(20	)
Balance at end of year	$	2,786		$	2,524

Components of Net Periodic Benefit Cost

	Defined Benefit Pension Plan						Supplemental Insurance/ Retirement Plan
	2016			2015			2016			2015
(dollars in thousands)
Change projected in benefit obligation
Benefit obligation at beginning of year	$	38,597		$	40,011		$	38,204		$	31,989
Service cost		1,273			1,343			1,820			1,589
Interest cost		1,358			1,576			1,334			1,365
Actuarial (gain)/loss		2,593			(3,424	)		(1,653	)		4,304
Benefits paid		(1,566	)		(909	)		(1,095	)		(1,043	)
Projected benefit obligation at end of year	$	42,255		$	38,597		$	38,610		$	38,204
Change in plan assets
Fair value of plan assets at beginning of year	$	33,717		$	33,812
Actual return on plan assets		3,221			(1,186	)
Employer contributions		2,075			2,000
Benefits paid		(1,566	)		(909	)
Fair value of plan assets at end of year	$	37,447		$	33,717
(Unfunded) Funded status	$	(4,808	)	$	(4,880	)	$	(38,610	)	$	(38,204	)
Accumulated benefit obligation	$	42,255		$	38,597		$	36,392		$	34,884
Weighted-average assumptions as of December 31
Discount rate — Liability		3.99	%		4.18	%		3.85	%		4.03	%
Discount rate — Expense		4.18	%		4.00	%		4.01	%		4.00	%
Expected return on plan assets		8.00	%		8.00	%		NA			NA
Rate of compensation increase		4.00	%		4.00	%		4.00	%		4.00	%
Components of net periodic benefit cost
Service cost	$	1,273		$	1,343		$	1,820		$	1,589
Interest cost		1,358			1,576			1,334			1,365
Expected return on plan assets		(2,776	)		(2,749	)		—			—
Recognized prior service cost		(104	)		(104	)		114			114
Recognized net losses		801			812			805			599
Net periodic cost (benefit)	$	552		$	878		$	4,073		$	3,667
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Amortization of prior service cost	$	104		$	104		$	(114	)	$	(114	)
Net (gain) loss		1,347			(301	)		(2,458	)		3,705
Total recognized in other comprehensive income		1,451			(197	)		(2,572	)		3,591
Total recognized in net periodic benefit cost and other comprehensive income	$	2,003		$	681		$	1,501		$	7,258

Summary of Defined Pension Plan and Supplemental Insurance Retirement Plan

	December 31, 2016									December 31, 2015
	Plan			Supplemental Plan			Total			Plan			Supplemental Plan			Total
(dollars in thousands)
Prior service cost	$	204		$	(649	)	$	(445	)	$	308		$	(763	)	$	(455	)
Net actuarial loss		(13,999	)		(13,416	)		(27,415	)		(12,652	)		(15,874	)		(28,526	)
Total	$	(13,795	)	$	(14,065	)	$	(27,860	)	$	(12,344	)	$	(16,637	)	$	(28,981	)

Summary of Accumulated Other Comprehensive Loss Expected to be Recognized

The following table summarizes the amounts included in Accumulated Other Comprehensive Loss at December 31, 2016, expected to be recognized as components of net periodic benefit cost in the next year:

	Plan			Supplemental Plan
Amortization of prior service cost to be recognized in 2017	$	(104	)	$	114
Amortization of loss to be recognized in 2017		903			636