Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2018

Retirement Benefits [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,	2018			2017			2018			2017
Change in Benefit Obligation:
Benefit obligation at beginning of period		$80,723			$72,951			$15,203			$13,154
Service cost	2,244			2,149			108			129
Interest cost	2,715			2,673			475			428
Actuarial (gain) loss	(7,830		)	7,017			(252		)	2,275
Benefits paid	(4,344		)	(3,936		)	(908		)	(783		)
Administrative expenses	(128		)	(131		)	—			—
Benefit obligation at end of period	73,380			80,723			14,626			15,203
Change in Plan Assets:
Fair value of plan assets at beginning of period	87,364			75,787			—			—
Actual return on plan assets	288			12,644			—			—
Employer contributions	3,000			3,000			908			783
Benefits paid	(4,344		)	(3,936		)	(908		)	(783		)
Administrative expenses	(128		)	(131		)	—			—
Fair value of plan assets at end of period	86,180			87,364			—			—
Funded (unfunded) status at end of period		$12,800			$6,641			($14,626	)		($15,203	)

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,	2018			2017			2018		2017
Net actuarial loss		$9,453			$13,795			$5,785		$6,448
Prior service credit	(16		)	(39		)	—		(1		)
Total pre-tax amounts recognized in accumulated other comprehensive income		$9,437			$13,756			$5,785		$6,447

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,	2018			2017			2016			2018			2017			2016
Net Periodic Benefit Cost:
Service cost (1)		$2,244			$2,149			$2,148			$108			$129			$122
Interest cost (2)	2,715			2,673			2,576			475			428			432
Expected return on plan assets (2)	(5,272		)	(4,942		)	(4,633		)	—			—			—
Amortization of prior service credit (2)	(23		)	(23		)	(23		)	(1		)	(1		)	(1		)
Recognized net actuarial loss (2)	1,496			1,114			828			411			347			247
Net periodic benefit cost	1,160			971			896			993			903			800
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (on a pre-tax basis):
Net (gain) loss	(4,342		)	(1,798		)	2,904			(663		)	1,928			127
Prior service cost	23			23			23			1			1			1
Recognized in other comprehensive (loss) income	(4,319		)	(1,775		)	2,927			(662		)	1,929			128
Total recognized in net periodic benefit cost and other comprehensive (loss) income		($3,159	)		($804	)		$3,823			$331			$2,832			$928

(1) Included in salaries and employee benefits expense in the Consolidated Statements of Income.

(2) Included in other expenses in the Consolidated Statements of Income.

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, 2018 and 2017:

	Qualified Pension Plan		Non-Qualified Retirement Plans
	2018	2017	2018	2017
Measurement date	Dec 31, 2018	Dec 31, 2017	Dec 31, 2018	Dec 31, 2017
Discount rate	4.38%	3.69%	4.30%	3.60%
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, 2018, 2017 and 2016:

	Qualified Pension Plan			Non-Qualified Retirement Plans
	2018	2017	2016	2018	2017	2016
Measurement date	Dec 31, 2017	Dec 31, 2016	Dec 31, 2015	Dec 31, 2017	Dec 31, 2016	Dec 31, 2015
Equivalent single discount rate for benefit obligations	3.69%	4.18%	4.48%	3.58%	3.96%	4.20%
Equivalent single discount rate for service cost	3.76	4.29	4.63	3.79	4.25	4.59
Equivalent single discount rate for interest cost	3.42	3.73	3.88	3.22	3.36	3.44
Expected long-term return on plan assets	6.75	6.75	6.75	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 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, 2018	Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents		$25,986		$—		$—		$25,986
Obligations of U.S. government-sponsored enterprises	—		21,787		—		21,787
Obligations of states and political subdivisions	—		2,597		—		2,597
Corporate bonds	—		10,361		—		10,361
Common stocks	9,957		—		—		9,957
Mutual funds	15,492		—		—		15,492
Total plan assets		$51,435		$34,745		$—		$86,180

(Dollars in thousands)
	Fair Value Measurements Using						Assets at Fair Value
December 31, 2017	Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents		$3,760		$—		$—		$3,760
Obligations of U.S. government-sponsored enterprises	—		5,926		—		5,926
Obligations of states and political subdivisions	—		2,971		—		2,971
Corporate bonds	—		13,112		—		13,112
Common stocks	38,508		—		—		38,508
Mutual funds	23,087		—		—		23,087
Total plan assets		$65,355		$22,009		$—		$87,364

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

December 31,	2018		2017
Asset Category:
Cash and cash equivalents	30.2	%	4.3	%
Fixed income securities	40.3		30.0
Equity securities	29.5		65.7
Total	100.0	%	100.0	%

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 Retirement Plans
2019		$4,034		$907
2020	3,817		898
2021	3,823		886
2022	4,088		878
2023	4,091		878
Years 2024 - 2028	28,295		4,355