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Comprehensive Income
 12 Months Ended
Dec. 31, 2023
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 2023, 2022, and 2021 are as follows:

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 year
106,845 22,438 84,407 
Unrealized gains (losses) on securities with credit loss recognized in earnings
60,234 12,649 47,585 
Amounts reclassified into net income:
Net realized (gains) losses on disposals and intent-to-sell AFS securities
20,458 4,296 16,162 
Credit loss (benefit) expense
(12,898)(2,709)(10,189)
Total unrealized gains (losses) on investment securities
174,639 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$280,186 55,300 224,886 
Components of OCI:   
Unrealized gains (losses) on investment securities:   
Unrealized holding gains (losses) during the year(668,107)(140,302)(527,805)
Unrealized gains (losses) on securities with credit loss recognized in earnings(187,968)(39,473)(148,495)
Amounts reclassified into net income:
HTM securities4 1 3 
Net realized (gains) losses on disposals and intent-to-sell AFS securities60,048 12,610 47,438 
Credit loss (benefit) expense39,169 8,225 30,944 
Total unrealized gains (losses) on investment securities(756,854)(158,939)(597,915)
Defined benefit pension and post-retirement plans:   
Net actuarial gain (loss)(20,941)(4,398)(16,543)
Amounts reclassified into net income:   
Net actuarial (gain) loss1,668 351 1,317 
Total defined benefit pension and post-retirement plans(19,273)(4,047)(15,226)
Other comprehensive income (loss)(776,127)(162,986)(613,141)
Comprehensive income (loss)$(495,941)(107,686)(388,255)

2021   
($ in thousands)GrossTaxNet
Net income$505,310 101,473 403,837 
Components of OCI:   
Unrealized gains (losses) on investment securities:   
Unrealized holding gains (losses) during the year(151,391)(31,793)(119,598)
Unrealized gains (losses) on securities with credit loss recognized in earnings(9,061)(1,902)(7,159)
Amounts reclassified into net income:
HTM securities(11)(2)(9)
Net realized (gains) losses on disposals and intent-to-sell AFS securities(3,825)(803)(3,022)
Credit loss (benefit) expense6,858 1,440 5,418 
Total unrealized gains (losses) on investment securities(157,430)(33,060)(124,370)
Defined benefit pension and post-retirement plans:   
Net actuarial gain (loss)21,636 4,543 17,093 
Amounts reclassified into net income:   
Net actuarial (gain) loss2,772 582 2,190 
Total defined benefit pension and post-retirement plans24,408 5,125 19,283 
Other comprehensive income (loss)(133,022)(27,935)(105,087)
Comprehensive income (loss)$372,288 73,538 298,750 

(b) The balances of, and changes in, each component of AOCI (net of taxes) as of December 31, 2023, and 2022, were as follows:

Net Unrealized Gains (Losses) on Investment Securities
Defined Benefit Pension and Post-retirement Plans
($ in thousands)
Credit Loss Related1
HTM RelatedAll OtherInvestments SubtotalTotal AOCI
Balance, December 31, 2021$(4,287)(3)185,170 180,880 (65,781)115,099 
OCI before reclassifications(148,495)— (527,805)(676,300)(16,543)(692,843)
Amounts reclassified from AOCI30,944 3 47,438 78,385 1,317 79,702 
Net current period OCI(117,551)3 (480,367)(597,915)(15,226)(613,141)
Balance, December 31, 2022(121,838)— (295,197)(417,035)(81,007)(498,042)
OCI before reclassifications47,585 — 84,407 131,992 (15,315)116,677 
Amounts reclassified from AOCI(10,189)— 16,162 5,973 2,391 8,364 
Net current period OCI37,396 — 100,569 137,965 (12,924)125,041 
Balance, December 31, 2023$(84,442)— (194,628)(279,070)(93,931)(373,001)
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, 2023Year ended December 31, 2022Affected Line Item in the Consolidated Statements of Income
HTM related
Unrealized (gains) losses on HTM disposals
$— (7)
Net realized and unrealized investment gains (losses)
Amortization of net unrealized (gains) losses on HTM securities
— 11 Net investment income earned
— 4 Income before federal income tax
— (1)Total federal income tax expense
— 3 Net income
Net realized (gains) losses on disposals and intent-to-sell AFS securities
Net realized (gains) losses on disposals and intent-to-sell AFS securities
20,458 60,048 
Net realized and unrealized investment gains (losses)
20,458 60,048 Income before federal income tax
(4,296)(12,610)Total federal income tax expense
16,162 47,438 Net income
Credit loss related
      Credit loss (benefit) expense
(12,898)39,169 
Net realized and unrealized investment gains (losses)
(12,898)39,169 Income before federal income tax
2,709 (8,225)Total federal income tax expense
(10,189)30,944 Net income
Defined benefit pension and post-retirement life plans
Net actuarial loss 695 359 Loss and loss expense incurred
2,331 1,309 Other insurance expenses
Total defined benefit pension and post-retirement life3,026 1,668 Income before federal income tax
(635)(351)Total federal income tax expense
2,391 1,317 Net income
Total reclassifications for the period$8,364 79,702 Net income