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Comprehensive Income
12 Months Ended
Dec. 31, 2024
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Comprehensive Income Comprehensive Income
(a) The components of comprehensive income, both gross and net of tax, for 2024, 2023, and 2022 were as follows:

2024   
($ in thousands)GrossTaxNet
Net income$258,034 51,022 207,012 
Components of OCI:   
Unrealized gains (losses) on investment securities:
   
Unrealized holding gains (losses) during the year
22,880 4,805 18,075 
Unrealized gains (losses) on securities with credit loss recognized in earnings
9,861 2,071 7,790 
Amounts reclassified into net income:
Net realized (gains) losses on disposals and intent-to-sell AFS securities
(1,903)(399)(1,504)
Credit loss (benefit) expense
5,628 1,182 4,446 
Total unrealized gains (losses) on investment securities
36,466 7,659 28,807 
Defined benefit pension and post-retirement plans:   
Net actuarial gain (loss)
5,434 1,141 4,293 
Amounts reclassified into net income:   
Net actuarial (gain) loss3,868 812 3,056 
Total defined benefit pension and post-retirement plans9,302 1,953 7,349 
Other comprehensive income (loss)
45,768 9,612 36,156 
Comprehensive income (loss)
$303,802 60,634 243,168 

2023   
($ in thousands)GrossTaxNet
Net income$458,412 93,174 365,238 
Components of OCI:   
Unrealized gains (losses) on investment securities:   
Unrealized holding gains (losses) during the year106,845 22,438 84,407 
Unrealized gains (losses) on securities with credit loss recognized in earnings60,234 12,649 47,585 
Amounts reclassified into net income:
Net realized (gains) losses on disposals and intent-to-sell AFS securities20,458 4,296 16,162 
Credit loss (benefit) expense(12,898)(2,709)(10,189)
Total unrealized gains (losses) on investment securities174,639 36,674 137,965 
Defined benefit pension and post-retirement plans:   
Net actuarial gain (loss)(19,385)(4,070)(15,315)
Amounts reclassified into net income:   
Net actuarial (gain) loss3,026 635 2,391 
Total defined benefit pension and post-retirement plans(16,359)(3,435)(12,924)
Other comprehensive income (loss)158,280 33,239 125,041 
Comprehensive income (loss)$616,692 126,413 490,279 

2022   
($ in thousands)GrossTaxNet
Net income$280,186 55,300 224,886 
Components of OCI:   
Unrealized gains (losses) on investment securities:   
Unrealized holding gains (losses) during the year(668,107)(140,302)(527,805)
Unrealized gains (losses) on securities with credit loss recognized in earnings(187,968)(39,473)(148,495)
Amounts reclassified into net income:
HTM securities
Net realized (gains) losses on disposals and intent-to-sell AFS securities60,048 12,610 47,438 
Credit loss (benefit) expense39,169 8,225 30,944 
Total unrealized gains (losses) on investment securities(756,854)(158,939)(597,915)
Defined benefit pension and post-retirement plans:   
Net actuarial gain (loss)(20,941)(4,398)(16,543)
Amounts reclassified into net income:   
Net actuarial (gain) loss1,668 351 1,317 
Total defined benefit pension and post-retirement plans(19,273)(4,047)(15,226)
Other comprehensive income (loss)(776,127)(162,986)(613,141)
Comprehensive income (loss)$(495,941)(107,686)(388,255)
(b) The balances of, and changes in, each component of AOCI (net of taxes) as of December 31, 2024, and 2023, were as follows:

Net Unrealized Gains (Losses) on Investment Securities
Defined Benefit Pension and Post-retirement Plans
($ in thousands)
Credit Loss Related1
All OtherInvestments SubtotalTotal AOCI
Balance, December 31, 2022$(121,838)(295,197)(417,035)(81,007)(498,042)
OCI before reclassifications47,585 84,407 131,992 (15,315)116,677 
Amounts reclassified from AOCI(10,189)16,162 5,973 2,391 8,364 
Net current period OCI37,396 100,569 137,965 (12,924)125,041 
Balance, December 31, 2023(84,442)(194,628)(279,070)(93,931)(373,001)
OCI before reclassifications7,790 18,075 25,865 4,293 30,158 
Amounts reclassified from AOCI4,446 (1,504)2,942 3,056 5,998 
Net current period OCI12,236 16,571 28,807 7,349 36,156 
Balance, December 31, 2024$(72,206)(178,057)(250,263)(86,582)(336,845)
1Represents change in unrealized gains (losses) on securities with credit loss recognized in earnings.

The reclassifications out of AOCI were as follows:
($ in thousands)Year ended December 31, 2024Year ended December 31, 2023Affected Line Item in the Consolidated Statements of Income
Net realized (gains) losses on disposals and intent-to-sell AFS securities
Net realized (gains) losses
$(1,903)20,458 Net realized and unrealized investment gains (losses)
Tax (benefit) expense
399 (4,296)Total federal income tax expense
Net of taxes
(1,504)16,162 Net income
Credit loss related
      Credit loss (benefit) expense
5,628 (12,898)
Net realized and unrealized investment gains (losses)
Tax (benefit) expense
(1,182)2,709 Total federal income tax expense
Net of taxes
4,446 (10,189)Net income
Defined benefit pension and post-retirement life plans
Net actuarial loss 890 695 Loss and loss expense incurred
Net actuarial loss2,978 2,331 Other insurance expenses
Total
3,868 3,026 Income before federal income tax
Tax (benefit) expense
(812)(635)Total federal income tax expense
Net of taxes
3,056 2,391 Net income
Total reclassifications for the period$5,998 8,364 Net income