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Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Cost

Net periodic benefit cost of these plans for the years ended December 31, was as follows:

			2023						2022						2021
			(dollars in thousands)
Service cost			$	—					$	—					$	—
Interest cost on projected benefit obligation			25						35						23
Amortization of transition obligation			—						—						—
Amortization of prior service cost			76						75						76
Gain amortization			(108)						(96)						(27)
Net periodic benefit cost			$	(7)					$	14					$	72

Schedule of Changes in Benefit Obligations and Plan Assets

The following table sets forth the change in the benefit obligation and plan assets as of December 31:

			2023						2022
			(dollars in thousands)
Change in Benefit Obligation
Benefit obligation at beginning of year			$	708					$	986
Service cost			—						—
Interest cost			35						22
Amendments			—						—
Actuarial gain			(119)						(212)
Net benefits paid			(63)						(88)
Benefit obligation at end of year			561						708
Change in Plan Assets
Fair value of plan assets at beginning of year			—						—
Actual return on plan assets			—						—
Employer contributions			63						88
Net benefits paid			(63)						(88)
Fair value of plan assets at end of year			—						—
Funded Status at End of Year			561						708
Unrecognized prior service cost			(310)						(386)
Unrecognized net gain			750						728
Amounts recognized in retained earnings			$	1,001					$	1,050

Schedule of Amounts Recognized as Other Liabilities

As of December 31, the funded status of the plan is:

			2023						2022
			(dollars in thousands)
Amounts Recognized in the Statement of Financial Condition as Other liabilities			$	561					$	708

Schedule of Amounts Recognized in Accumulated Other Comprehensive Income

The following table identifies the related tax effects allocated to each component of other comprehensive income in the Consolidated Statements of Comprehensive Income as of December 31. Reclassification adjustments related to securities available for sale are included in the “Net securities (losses) gains” line in the Consolidated Statements of Income.

			2023																		2022																		2021
			Pretax Amount						Tax (Expense) Benefit						Net of Tax Amount						Pretax Amount						Tax (Expense) Benefit						Net of Tax Amount						Pretax Amount						Tax (Expense) Benefit						Net of Tax Amount
			(dollars in thousands)
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period			$	18,499					$	(3,449)					$	15,050					$	(131,838)					$	27,686					$	(104,152)					$	(29,892)					$	6,278					$	(23,614)
Reclassification adjustment for losses (gains) on securities included in net income			103						(22)						81						(2)						—						(2)						(16)						3						(13)
Total unrealized gains (losses) on securities			18,602						(3,471)						15,131						(131,840)						27,686						(104,154)						(29,908)						6,281						(23,627)
Unrealized gains (losses) on derivatives:
Unrealized holding gains (losses) on derivatives arising during the period			13,462						(2,733)						10,729						(31,573)						6,630						(24,943)						(3,356)						705						(2,651)
Total unrealized gains (losses) on derivatives			13,462						(2,733)						10,729						(31,573)						6,630						(24,943)						(3,356)						705						(2,651)
Unrealized gains for postretirement obligations:
Prior service cost			76						(15)						61						76						(16)						60						76						(16)						60
Net gain			22						(7)						15						143						(30)						113						275						(58)						217
Total unrealized gains for postretirement obligations			98						(22)						76						219						(46)						173						351						(74)						277
Total other comprehensive income (loss)			$	32,162					$	(6,226)					$	25,936					$	(163,194)					$	34,270					$	(128,924)					$	(32,913)					$	6,912					$	(26,001)

The following table sets forth the amounts recognized in accumulated other comprehensive income that have not yet been recognized as components of net periodic benefit costs as of December 31:

			2023						2022						2021
			(dollars in thousands)
Amounts recognized in accumulated other comprehensive income, net of tax:
Net (gain) loss			$	(590)					$	(575)					$	(461)
Prior service cost			244						305						364
Total			$	(346)					$	(270)					$	(97)

Schedule of Weighted-Average Assumptions Used to Determine Benefit Obligation

Weighted-average assumptions used to determine the benefit obligation as of December 31 are as follows:

			2023						2022						2021
Weighted-Average Assumptions
Discount rate			4.90		%				5.31		%				2.38		%
Health care cost trend: Initial			6.95		%				6.50		%				5.90		%
Health care cost trend: Ultimate			4.75		%				4.75		%				4.75		%
Year ultimate reached			2029						2028						2027

Schedule of Weighted-Average Assumptions Used to Determine Net Periodic Cost

Weighted-average assumptions used to determine the benefit obligation as of December 31 are as follows:

			2023						2022						2021
Weighted-Average Assumptions
Discount rate			4.90		%				5.31		%				2.38		%
Health care cost trend: Initial			6.95		%				6.50		%				5.90		%
Health care cost trend: Ultimate			4.75		%				4.75		%				4.75		%
Year ultimate reached			2029						2028						2027

Weighted-average assumptions used to determine the net benefit costs as of December 31 are as follows: 

			2023						2022						2021
Weighted-Average Assumptions for Net Periodic Cost
Discount rate			5.31		%				2.38		%				1.83		%
Health care cost trend: Initial			6.50		%				5.90		%				5.95		%
Health care cost trend: Ultimate			4.75		%				4.75		%				4.75		%
Year ultimate reached			2028						2027						2026
Corridor			10.00		%				10.00		%				10.00		%
Recognition period for gains and losses			9.3						9.9						10.4

Schedule of Projected Benefit Payments

As of December 31, 2023, the projected benefit payments for the next ten years are as follows:

			Projected Benefit         Payments
			(dollars in thousands)
2024			$	83,837
2025			78,462
2026			73,542
2027			67,517
2028			61,396
2029 - 2033			219,643

Schedule of Amounts Recognized in Accumulated Other Comprehensive Income

The estimated costs that will be amortized from accumulated other comprehensive income into net periodic cost for 2024 are as follows:

			Postretirement Benefits
			(dollars in thousands)
Net gain			$	(108)
Prior service cost			76
Total			$	(32)

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