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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
2023 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
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) loss |  | 3,026 |  |  | 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) |  | Gross |  | Tax |  | Net
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 |  | 4 |  |  | 1 |  |  | 3 |
Net realized (gains) losses on disposals and intent-to-sell AFS securities |  | 60,048 |  |  | 12,610 |  |  | 47,438 |
Credit loss (benefit) expense |  | 39,169 |  |  | 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) loss |  | 1,668 |  |  | 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) |  | Gross |  | Tax |  | Net
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) expense |  | 6,858 |  |  | 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) loss |  | 2,772 |  |  | 582 |  |  | 2,190 |
Total defined benefit pension and post-retirement plans |  | 24,408 |  |  | 5,125 |  |  | 19,283 |
Other comprehensive income (loss) |  | (133,022) |  |  | (27,935) |  |  | (105,087) |
Comprehensive income (loss) |  | $ | 372,288 |  |  | 73,538 |  |  | 298,750 |
Schedule of Components of Accumulated Other Comprehensive Income |
|  |  |  | Net Unrealized Gains (Losses) on Investment Securities |  | Defined Benefit Pension and Post-retirement Plans |  |
($ in thousands) |  |  |  | Credit Loss Related 1 |  | HTM Related |  | All Other |  | Investments Subtotal |  |  | Total 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 AOCI |  |  |  | 30,944 |  |  | 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 reclassifications |  |  |  | 47,585 |  |  | — |  |  | 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 OCI |  |  |  | 37,396 |  |  | — |  |  | 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.
Schedule of Reclassification out of Accumulated Other Comprehensive Income |
($ in thousands) |  | Year ended December 31, 2023 |  | Year ended December 31, 2022 |  | Affected 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 life |  | 3,026 |  |  | 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

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