Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2022

Accumulated Other Comprehensive Income (Loss)

Schedule of changes in accumulated other comprehensive income (loss)

			Income
			Tax
	Pre-tax		Benefit		Net of
(dollars in thousands)	Amount		(Expense)		Tax
Accumulated other comprehensive loss at December 31, 2021	$	(165,967)	$	44,274	$	(121,693)
Year ended December 31, 2022
Pension and other benefits:
Net actuarial gains arising during the year		20,710		(5,524)		15,186
Amortization of net loss included in net income		5,146		(1,373)		3,773
Net change in pension and other benefits		25,856		(6,897)		18,959
Investment securities:
Unrealized net losses arising during the year		(773,667)		206,376		(567,291)
Reclassification of net losses to net income:
Amortization of unrealized holding losses on held-to-maturity securities		48,378		(12,905)		35,473
Net change in investment securities		(725,289)		193,471		(531,818)
Cash flow derivative hedges:
Unrealized net losses arising during the year		(6,710)		1,790		(4,920)
Reclassification of net losses included in net income		297		(79)		218
Net change in cash flow derivative hedges		(6,413)		1,711		(4,702)
Other comprehensive loss		(705,846)		188,285		(517,561)
Accumulated other comprehensive loss at December 31, 2022	$	(871,813)	$	232,559	$	(639,254)

			Income
			Tax
	Pre-tax		Benefit		Net of
(dollars in thousands)	Amount		(Expense)		Tax
Accumulated other comprehensive income at December 31, 2020	$	43,098	$	(11,494)	$	31,604
Year ended December 31, 2021
Pension and other benefits:
Net actuarial gains arising during the year		3,107		(829)		2,278
Amortization of net loss included in net income		6,913		(1,844)		5,069
Net change in pension and other benefits		10,020		(2,673)		7,347
Investment securities:
Unrealized net losses arising during the year		(218,983)		58,414		(160,569)
Reclassification of net gains to net income:
Investment securities gains, net		(102)		27		(75)
Net change in investment securities		(219,085)		58,441		(160,644)
Other comprehensive loss		(209,065)		55,768		(153,297)
Accumulated other comprehensive loss at December 31, 2021	$	(165,967)	$	44,274	$	(121,693)

			Income
			Tax
	Pre-tax		Benefit		Net of
(dollars in thousands)	Amount		(Expense)		Tax
Accumulated other comprehensive loss at December 31, 2019	$	(43,450)	$	11,701	$	(31,749)
Year ended December 31, 2020
Pension and other benefits:
Net actuarial losses arising during the year		(10,399)		2,774		(7,625)
Prior service credit		(51)		14		(37)
Amortization of net loss included in net income		5,595		(1,492)		4,103
Change in Company tax rate		—		(96)		(96)
Net change in pension and other benefits		(4,855)		1,200		(3,655)
Investment securities:
Unrealized net gains arising during the year		91,289		(24,365)		66,924
Reclassification of net losses to net income:
Investment securities losses, net		114		(30)		84
Net change in investment securities		91,403		(24,395)		67,008
Other comprehensive income		86,548		(23,195)		63,353
Accumulated other comprehensive income at December 31, 2020	$	43,098	$	(11,494)	$	31,604

Summary of changes in accumulated other comprehensive income (loss), net of tax

	Pensions								Accumulated
	and		Available-for-Sale		Held-to-Maturity		Cash Flow		Other
	Other		Investment		Investment		Derivative		Comprehensive
(dollars in thousands)	Benefits		Securities		Securities		Hedges		Income (Loss)
Year Ended December 31, 2022
Balance at beginning of year	$	(24,390)	$	(97,303)	$	—	$	—	$	(121,693)
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity		—		372,419		(372,419)		—		—
Other comprehensive income (loss)		18,959		(567,291)		35,473		(4,702)		(517,561)
Balance at end of year	$	(5,431)	$	(292,175)	$	(336,946)	$	(4,702)	$	(639,254)
Year Ended December 31, 2021
Balance at beginning of year	$	(31,737)	$	63,341	$	—	$	—	$	31,604
Other comprehensive income (loss)		7,347		(160,644)		—		—		(153,297)
Balance at end of year	$	(24,390)	$	(97,303)	$	—	$	—	$	(121,693)
Year Ended December 31, 2020
Balance at beginning of year	$	(28,082)	$	(3,667)	$	—	$	—	$	(31,749)
Other comprehensive (loss) income		(3,655)		67,008		—		—		63,353
Balance at end of year	$	(31,737)	$	63,341	$	—	$	—	$	31,604