Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2023

Equity [Abstract]

Schedule of AOCI

The following table summarizes the changes within each classification of AOCI, net of tax:

(dollars in thousands)	Unrealized Gains and Losses on Available- for-Sale Debt Securities		Unrealized Gains and Losses on Held-to- Maturity Securities		Gains and Losses on Hedges		Defined Benefit Pension Plans		Total
Three Months Ended March 31, 2023
Balance at beginning of period	$	(642,346)	$	(112,664)	$	(31,549)	$	137	$	(786,422)
Other comprehensive income (loss) before    reclassifications	27,219		1,325		35,985		—		64,529
Amounts reclassified from AOCI to income (1)	3,867		4,373		5,436		(141)		13,535
Balance at end of period	$	(611,260)	$	(106,966)	$	9,872	$	(4)	$	(708,358)
Three Months Ended March 31, 2022
Balance at beginning of period	$	(2,950)	$	—	$	543	$	32	$	(2,375)
Other comprehensive income (loss) before    reclassifications	(311,153)		(16,963)		(7,170)		—		(335,286)
Amounts reclassified from AOCI to income (1)	(261)		236		(505)		(8)		(538)
Balance at end of period	$	(314,364)	$	(16,727)	$	(7,132)	$	24	$	(338,199)

(1)See table below for details about reclassifications to income.

Reclassifications out of AOCI

The following table summarizes the significant amounts reclassified out of each component of AOCI for the three months ended March 31, 2023 and 2022:

	Three Months Ended March 31,
(dollars in thousands)	2023		2022
Details about AOCI Components	Amount Reclassified from AOCI				Affected Line Item in the Statement of Income
Unrealized gains and losses on    available-for-sale securities	$	(5,216)	$	342	Debt securities gains (losses), net
	1,349		(81)		Income tax (expense) benefit
	$	(3,867)	$	261	Net income (loss)
Unrealized gains and losses on    held-to-maturity securities	$	(5,829)	$	(310)	Interest income (expense)
	1,456		74		Income tax (expense) benefit
	$	(4,373)	$	(236)	Net income (loss)
Gains and losses on hedges    Interest rate contracts	$	(7,292)	$	669	Interest income (expense)
	1,856		(164)		Income tax (expense) benefit
	$	(5,436)	$	505	Net income (loss)
Amortization of defined benefit    pension items
Actuarial gains (losses)	$	188	$	11	Salaries and employee benefits
	(47)		(3)		Income tax (expense) benefit
	$	141	$	8	Net income (loss)
Total reclassifications for the period	$	(13,535)	$	538	Net income (loss)