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Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
First Quarter 2023 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 114,759 |  |  | 22,185 |  |  | 92,574 |
Components of OCI: |  |  |  |  |  |
Unrealized gains (losses) on investment securities: |  |  |  |  |  |
Unrealized holding gains (losses) during the period |  | 65,925 |  |  | 13,846 |  |  | 52,079 |
Unrealized gains (losses) on securities with credit loss recognized in earnings |  | 22,431 |  |  | 4,710 |  |  | 17,721 |
Amounts reclassified into net income: |  |  |  |  |  |
Net realized (gains) losses on disposals and intent-to-sell AFS securities |  | 6,104 |  |  | 1,282 |  |  | 4,822 |
Credit loss (benefit) expense |  | (9,529) |  |  | (2,002) |  |  | (7,527) |
Total unrealized gains (losses) on investment securities |  | 84,931 |  |  | 17,836 |  |  | 67,095 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial (gain) loss |  | 757 |  |  | 159 |  |  | 598 |
Total defined benefit pension and post-retirement plans |  | 757 |  |  | 159 |  |  | 598 |
Other comprehensive income (loss) |  | 85,688 |  |  | 17,995 |  |  | 67,693 |
Comprehensive income (loss) |  | $ | 200,447 |  |  | 40,180 |  |  | 160,267 |
First Quarter 2022 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 69,890 |  |  | 13,560 |  |  | 56,330 |
Components of OCI: |  |  |  |  |  |
Unrealized gains (losses) on investment securities: |  |  |  |  |  |
Unrealized holding gains (losses) during the period |  | (261,832) |  |  | (54,984) |  |  | (206,848) |
Unrealized gains (losses) on securities with credit loss recognized in earnings |  | (86,621) |  |  | (18,191) |  |  | (68,430) |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | 1 |  |  | — |  |  | 1 |
Net realized (gains) losses on disposals and intent-to-sell AFS securities |  | 15,991 |  |  | 3,358 |  |  | 12,633 |
Credit loss (benefit) expense |  | 22,052 |  |  | 4,631 |  |  | 17,421 |
Total unrealized gains (losses) on investment securities |  | (310,409) |  |  | (65,186) |  |  | (245,223) |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial (gain) loss |  | 417 |  |  | 88 |  |  | 329 |
Total defined benefit pension and post-retirement plans |  | 417 |  |  | 88 |  |  | 329 |
Other comprehensive income (loss) |  | (309,992) |  |  | (65,098) |  |  | (244,894) |
Comprehensive income (loss) |  | $ | (240,102) |  |  | (51,538) |  |  | (188,564) |
Schedule of Components of Accumulated Other Comprehensive Income Net of Tax |
March 31, 2023 |  | Net Unrealized Gains (Losses) on Investment Securities |  | Defined Benefit Pension and Post-Retirement Plans |  | Total AOCI
($ in thousands) |  | Credit Loss Related 1 |  | All Other |  | Investments Subtotal |  |
Balance, December 31, 2022 |  | $ | (121,838) |  |  | (295,197) |  |  | (417,035) |  |  | (81,007) |  |  | (498,042) |
OCI before reclassifications |  | 17,721 |  |  | 52,079 |  |  | 69,800 |  |  | — |  |  | 69,800 |
Amounts reclassified from AOCI |  | (7,527) |  |  | 4,822 |  |  | (2,705) |  |  | 598 |  |  | (2,107) |
Net current period OCI |  | 10,194 |  |  | 56,901 |  |  | 67,095 |  |  | 598 |  |  | 67,693 |
Balance, March 31, 2023 |  | $ | (111,644) |  |  | (238,296) |  |  | (349,940) |  |  | (80,409) |  |  | (430,349) |
1 Represents change in unrealized gains (losses) on securities with credit loss recognized in earnings.
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income |
|  | Quarter ended March 31, |  |  |  | Affected Line Item in the Unaudited Consolidated Statements of Income
($ in thousands) |  | 2023 |  | 2022 |  |  |  |  |
HTM related |  |  |  |  |  |  |  |  |  |
Unrealized (gains) losses on HTM disposals |  | $ | — |  |  | — |  |  |  |  |  |  | Net realized and unrealized investment gains (losses)
Amortization of net unrealized losses (gains) on HTM securities |  | — |  |  | 1 |  |  |  |  |  |  | Net investment income earned
|  | — |  |  | 1 |  |  |  |  |  |  | Income before federal income tax
|  | — |  |  | — |  |  |  |  |  |  | Total federal income tax expense
|  | — |  |  | 1 |  |  |  |  |  |  | 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 |  | 6,104 |  |  | 15,991 |  |  |  |  |  |  | Net realized and unrealized investment gains (losses)
|  | 6,104 |  |  | 15,991 |  |  |  |  |  |  | Income before federal income tax
|  | (1,282) |  |  | (3,358) |  |  |  |  |  |  | Total federal income tax expense
|  | 4,822 |  |  | 12,633 |  |  |  |  |  |  | Net income
Credit loss related |  |  |  |  |  |  |  |  |  |
Credit loss (benefit) expense |  | (9,529) |  |  | 22,052 |  |  |  |  |  |  | Net realized and unrealized investment gains (losses)
|  | (9,529) |  |  | 22,052 |  |  |  |  |  |  | Income before federal income tax
|  | 2,002 |  |  | (4,631) |  |  |  |  |  |  | Total federal income tax expense
|  | (7,527) |  |  | 17,421 |  |  |  |  |  |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 175 |  |  | 96 |  |  |  |  |  |  | Loss and loss expense incurred
|  | 582 |  |  | 321 |  |  |  |  |  |  | Other insurance expenses
Total defined benefit pension and post-retirement life |  | 757 |  |  | 417 |  |  |  |  |  |  | Income before federal income tax
|  | (159) |  |  | (88) |  |  |  |  |  |  | Total federal income tax expense
|  | 598 |  |  | 329 |  |  |  |  |  |  | Net income
Total reclassifications for the period |  | $ | (2,107) |  |  | 30,384 |  |  |  |  |  |  | Net income

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