Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2023

AOCI Attributable to Parent [Abstract]

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 March 31, 2023	$	(834,206)	$	222,527	$	(611,679)
Three months ended June 30, 2023
Investment securities:
Unrealized net losses arising during the period		(14,025)		3,741		(10,284)
Reclassification of net losses to net income:
Amortization of unrealized holding losses on held-to-maturity securities		13,064		(3,485)		9,579
Net change in investment securities		(961)		256		(705)
Cash flow derivative hedges:
Unrealized net losses arising during the period		(2,053)		548		(1,505)
Reclassification of net losses included in net income		1,573		(420)		1,153
Net change in cash flow derivative hedges		(480)		128		(352)
Other comprehensive loss		(1,441)		384		(1,057)
Accumulated other comprehensive loss at June 30, 2023	$	(835,647)	$	222,911	$	(612,736)

			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)
Six months ended June 30, 2023
Investment securities:
Unrealized net gains arising during the period		11,013		(2,938)		8,075
Reclassification of net losses to net income:
Amortization of unrealized holding losses on held-to-maturity securities		24,772		(6,608)		18,164
Net change in investment securities		35,785		(9,546)		26,239
Cash flow derivative hedges:
Unrealized net losses arising during the period		(2,495)		665		(1,830)
Reclassification of net losses included in net income		2,876		(767)		2,109
Net change in cash flow derivative hedges		381		(102)		279
Other comprehensive income		36,166		(9,648)		26,518
Accumulated other comprehensive loss at June 30, 2023	$	(835,647)	$	222,911	$	(612,736)

			Income
			Tax
	Pre-tax		Benefit		Net of
(dollars in thousands)	Amount		(Expense)		Tax
Accumulated other comprehensive loss at March 31, 2022	$	(705,768)	$	188,266	$	(517,502)
Three months ended June 30, 2022
Investment securities:
Unrealized net losses arising during the period		(91,352)		24,369		(66,983)
Reclassification of net losses to net income:
Amortization of unrealized holding losses on held-to-maturity securities		19,929		(5,317)		14,612
Net change in investment securities		(71,423)		19,052		(52,371)
Cash flow derivative hedges:
Unrealized net losses arising during the period		(1,523)		407		(1,116)
Reclassification of net gains included in net income		(638)		170		(468)
Net change in cash flow derivative hedges		(2,161)		577		(1,584)
Other comprehensive loss		(73,584)		19,629		(53,955)
Accumulated other comprehensive loss at June 30, 2022	$	(779,352)	$	207,895	$	(571,457)

			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)
Six months ended June 30, 2022
Investment securities:
Unrealized net losses arising during the period		(629,437)		167,903		(461,534)
Reclassification of net losses to net income:
Amortization of unrealized holding losses on held-to-maturity securities		19,929		(5,317)		14,612
Net change in investment securities		(609,508)		162,586		(446,922)
Cash flow derivative hedges:
Unrealized net losses arising during the period		(3,239)		865		(2,374)
Reclassification of net gains included in net income		(638)		170		(468)
Net change in cash flow derivative hedges		(3,877)		1,035		(2,842)
Other comprehensive loss		(613,385)		163,621		(449,764)
Accumulated other comprehensive loss at June 30, 2022	$	(779,352)	$	207,895	$	(571,457)

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)
Three Months Ended June 30, 2023
Balance at beginning of period	$	(5,431)	$	(273,816)	$	(328,361)	$	(4,071)	$	(611,679)
Other comprehensive (loss) income		—		(10,284)		9,579		(352)		(1,057)
Balance at end of period	$	(5,431)	$	(284,100)	$	(318,782)	$	(4,423)	$	(612,736)
Six Months Ended June 30, 2023
Balance at beginning of period	$	(5,431)	$	(292,175)	$	(336,946)	$	(4,702)	$	(639,254)
Other comprehensive income		—		8,075		18,164		279		26,518
Balance at end of period	$	(5,431)	$	(284,100)	$	(318,782)	$	(4,423)	$	(612,736)
Three Months Ended June 30, 2022
Balance at beginning of period	$	(24,390)	$	(491,854)	$	—	$	(1,258)	$	(517,502)
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity		—		338,816		(338,816)		—		—
Other comprehensive (loss) income		—		(66,983)		14,612		(1,584)		(53,955)
Balance at end of period	$	(24,390)	$	(220,021)	$	(324,204)	$	(2,842)	$	(571,457)
Six Months Ended June 30, 2022
Balance at beginning of period	$	(24,390)	$	(97,303)	$	—	$	—	$	(121,693)
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity		—		338,816		(338,816)		—		—
Other comprehensive (loss) income		—		(461,534)		14,612		(2,842)		(449,764)
Balance at end of period	$	(24,390)	$	(220,021)	$	(324,204)	$	(2,842)	$	(571,457)