Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2024

Stockholders' Equity Note [Abstract]

Components of Accumulated Other Comprehensive Income (Loss)

A roll-forward of the components of Accumulated Other Comprehensive Income (Loss) is presented in the table that follows:

	Available for Sale Securities			HTM Securities Transferred from AFS			Employee Benefit Plans			Cash Flow Hedges			Equity Method Investment			Total
($ in thousands)
Balance, December 31, 2022	$	(584,408	)	$	(10,734	)	$	(97,952	)	$	(79,093	)	$	5		$	(772,182	)
Net change in unrealized gain		80,958			—			—			19,280			706			100,944
Reclassification of net loss realized and included in earnings		—			—			1,519			8,001			—			9,520
Valuation adjustments to employee benefit plans		—			—			(1,836	)		—			—			(1,836	)
Amortization of unrealized net gain or loss on securities transferred to HTM		—			494			—			—			—			494
Income tax (expense) benefit		(18,224	)		(111	)		71			(6,141	)		—			(24,405	)
Balance, March 31, 2023	$	(521,674	)	$	(10,351	)	$	(98,198	)	$	(57,953	)	$	711		$	(687,465	)
Balance, December 31, 2023	$	(450,748	)	$	(9,385	)	$	(103,061	)	$	(58,306	)	$	373		$	(621,127	)
Net change in unrealized gain (loss)		(48,264	)		—			—			(29,191	)		(344	)		(77,799	)
Reclassification of net loss realized and included in earnings		—			—			1,019			12,558			—			13,577
Valuation adjustments to employee benefit plans		—			—			22,014			—			—			22,014
Amortization of unrealized net loss on securities transferred to HTM		—			428			—			—			—			428
Income tax (expense) benefit		10,927			(96	)		(5,176	)		3,737			—			9,392
Balance, March 31, 2024	$	(488,085	)	$	(9,053	)	$	(85,204	)	$	(71,202	)	$	29		$	(653,515	)

Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income

The following table shows the line items in the consolidated statements of income affected by amounts reclassified from AOCI.

	Three Months Ended
Amount reclassified from AOCI (a)	March 31,						Affected line item on
($ in thousands)	2024			2023			the statement of income
Amortization of unrealized net loss on securities transferred to HTM	$	(428	)	$	(494	)	Interest income
Tax effect		96			111		Income taxes
Net of tax		(332	)		(383	)	Net income
Amortization of defined benefit pension and post-retirement items		(1,019	)		(1,519	)	Other noninterest expense (b)
Tax effect		229			340		Income taxes
Net of tax		(790	)		(1,179	)	Net income
Reclassification of unrealized gain (loss) on cash flow hedges		(12,658	)		(10,629	)	Interest income
Tax effect		2,844			2,393		Income taxes
Net of tax		(9,814	)		(8,236	)	Net income
Amortization of gain on terminated cash flow hedges		100			2,628		Interest income
Tax effect		(22	)		(592	)	Income taxes
Net of tax		78			2,036		Net income
Total reclassifications, net of tax	$	(10,858	)	$	(7,762	)	Net income

(a)Amounts in parentheses indicate reduction in net income.

(b)These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with other noninterest
expense (see Note 11 – Retirement Plans for additional details).