Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2023

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, 2022	$	(871,813)	$	232,559	$	(639,254)
Year ended December 31, 2023
Pension and other benefits:
Net actuarial losses arising during the year		(1,063)		284		(779)
Amortization of net loss included in net income		1,142		(305)		837
Net change in pension and other benefits		79		(21)		58
Investment securities:
Unrealized net gains arising during the year		55,141		(14,709)		40,432
Reclassification of net losses to net income:
Amortization of unrealized holding losses on held-to-maturity securities		48,190		(12,855)		35,335
Investment securities losses, net		39,986		(10,666)		29,320
Net change in investment securities		143,317		(38,230)		105,087
Cash flow derivative hedges:
Unrealized net losses arising during the year		(940)		251		(689)
Reclassification of net losses included in net income		6,257		(1,669)		4,588
Net change in cash flow derivative hedges		5,317		(1,418)		3,899
Other comprehensive income		148,713		(39,669)		109,044
Accumulated other comprehensive loss at December 31, 2023	$	(723,100)	$	192,890	$	(530,210)

			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)

Summary of changes in accumulated other comprehensive 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, 2023
Balance at beginning of year	$	(5,431)	$	(292,175)	$	(336,946)	$	(4,702)	$	(639,254)
Other comprehensive income		58		69,752		35,335		3,899		109,044
Balance at end of year	$	(5,373)	$	(222,423)	$	(301,611)	$	(803)	$	(530,210)
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)