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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
2021 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 505,310 |  |  | 101,473 |  |  | 403,837 |
Components of OCI: |  |  |  |  |  |
Unrealized (losses) gains on investment securities: |  |  |  |  |  |
Unrealized holding losses during the year |  | (151,391) |  |  | (31,793) |  |  | (119,598) |
Unrealized 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 on disposals and losses on intent-to-sell AFS securities |  | (3,825) |  |  | (803) |  |  | (3,022) |
Credit loss expense |  | 6,858 |  |  | 1,440 |  |  | 5,418 |
Total unrealized losses on investment securities |  | (157,430) |  |  | (33,060) |  |  | (124,370) |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Net actuarial gain |  | 21,636 |  |  | 4,543 |  |  | 17,093 |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 2,772 |  |  | 582 |  |  | 2,190 |
Total defined benefit pension and post-retirement plans |  | 24,408 |  |  | 5,125 |  |  | 19,283 |
Other comprehensive loss |  | (133,022) |  |  | (27,935) |  |  | (105,087) |
Comprehensive income |  | $ | 372,288 |  |  | 73,538 |  |  | 298,750 |
2020 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 302,988 |  |  | 56,633 |  |  | 246,355 |
Components of OCI: |  |  |  |  |  |
Unrealized gains (losses) on investment securities: |  |  |  |  |  |
Unrealized holding gains during the year |  | 168,487 |  |  | 35,383 |  |  | 133,104 |
Unrealized losses on securities with credit loss recognized in earnings |  | (8,176) |  |  | (1,717) |  |  | (6,459) |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (24) |  |  | (5) |  |  | (19) |
Net realized losses on disposals and losses on intent-to-sell AFS securities |  | 5,376 |  |  | 1,129 |  |  | 4,247 |
Credit loss expense |  | 5,042 |  |  | 1,058 |  |  | 3,984 |
Total unrealized gains on investment securities |  | 170,705 |  |  | 35,848 |  |  | 134,857 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Net actuarial gain |  | 1,515 |  |  | 318 |  |  | 1,197 |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 3,015 |  |  | 633 |  |  | 2,382 |
Total defined benefit pension and post-retirement plans |  | 4,530 |  |  | 951 |  |  | 3,579 |
Other comprehensive income |  | 175,235 |  |  | 36,799 |  |  | 138,436 |
Comprehensive income |  | $ | 478,223 |  |  | 93,432 |  |  | 384,791 |
2019 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 336,390 |  |  | 64,767 |  |  | 271,623 |
Components of OCI: |  |  |  |  |  |
Unrealized gains (losses) on investment securities: |  |  |  |  |  |
Unrealized holding gains during the year |  | 212,683 |  |  | 44,662 |  |  | 168,021 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (58) |  |  | (12) |  |  | (46) |
Realized losses on disposals and OTTI of AFS securities |  | 671 |  |  | 141 |  |  | 530 |
Total unrealized gains on investment securities |  | 213,296 |  |  | 44,791 |  |  | 168,505 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Net actuarial loss |  | (13,795) |  |  | (2,897) |  |  | (10,898) |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 2,657 |  |  | 558 |  |  | 2,099 |
Total defined benefit pension and post-retirement plans |  | (11,138) |  |  | (2,339) |  |  | (8,799) |
Other comprehensive income |  | 202,158 |  |  | 42,452 |  |  | 159,706 |
Comprehensive income |  | $ | 538,548 |  |  | 107,219 |  |  | 431,329 |
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, 2019 |  |  |  | $ | (71) |  |  | 25 |  |  | 170,439 |  |  | 170,393 |  |  | (88,643) |  |  | 81,750 |
OCI before reclassifications |  |  |  | (6,459) |  |  | — |  |  | 133,104 |  |  | 126,645 |  |  | 1,197 |  |  | 127,842 |
Amounts reclassified from AOCI |  |  |  | 3,984 |  |  | (19) |  |  | 4,247 |  |  | 8,212 |  |  | 2,382 |  |  | 10,594 |
Net current period OCI |  |  |  | (2,475) |  |  | (19) |  |  | 137,351 |  |  | 134,857 |  |  | 3,579 |  |  | 138,436 |
Balance, December 31, 2020 |  |  |  | (2,546) |  |  | 6 |  |  | 307,790 |  |  | 305,250 |  |  | (85,064) |  |  | 220,186 |
OCI before reclassifications |  |  |  | (7,159) |  |  | — |  |  | (119,598) |  |  | (126,757) |  |  | 17,093 |  |  | (109,664) |
Amounts reclassified from AOCI |  |  |  | 5,418 |  |  | (9) |  |  | (3,022) |  |  | 2,387 |  |  | 2,190 |  |  | 4,577 |
Net current period OCI |  |  |  | (1,741) |  |  | (9) |  |  | (122,620) |  |  | (124,370) |  |  | 19,283 |  |  | (105,087) |
Balance, December 31, 2021 |  |  |  | $ | (4,287) |  |  | (3) |  |  | 185,170 |  |  | 180,880 |  |  | (65,781) |  |  | 115,099 |
1Represents change in unrealized loss on securities with credit loss recognized in earnings.
Schedule of Reclassification out of Accumulated Other Comprehensive Income |
($ in thousands) |  | Year ended December 31, 2021 |  | Year ended December 31, 2020 |  | Affected Line Item in the Consolidated Statements of Income
HTM related |  |  |  |  |  |
Unrealized gains on HTM disposals |  | $ | (14) |  |  | (16) |  |  | Net realized and unrealized investment gains (losses)
Amortization of net unrealized gains on HTM securities |  | 3 |  |  | (8) |  |  | Net investment income earned
|  | (11) |  |  | (24) |  |  | Income before federal income tax
|  | 2 |  |  | 5 |  |  | Total federal income tax expense
|  | (9) |  |  | (19) |  |  | Net income
Net realized (gains) losses on disposals and losses on intent-to-sell AFS securities |  |  |  |  |  |
Net realized (gains) losses on disposals and losses on intent-to-sell AFS securities |  | (3,825) |  |  | 5,376 |  |  | Net realized and unrealized investment gains (losses)
|  | (3,825) |  |  | 5,376 |  |  | Income before federal income tax
|  | 803 |  |  | (1,129) |  |  | Total federal income tax expense
|  | (3,022) |  |  | 4,247 |  |  | Net income
Credit loss related |  |  |  |  |  |
Credit loss expense |  | 6,858 |  |  | 5,042 |  |  | Net realized and unrealized investment gains (losses)
|  | 6,858 |  |  | 5,042 |  |  | Income before federal income tax
|  | (1,440) |  |  | (1,058) |  |  | Total federal income tax expense
|  | 5,418 |  |  | 3,984 |  |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |
Net actuarial loss |  | 638 |  |  | 647 |  |  | Loss and loss expense incurred
|  | 2,134 |  |  | 2,368 |  |  | Other insurance expenses
Total defined benefit pension and post-retirement life |  | 2,772 |  |  | 3,015 |  |  | Income before federal income tax
|  | (582) |  |  | (633) |  |  | Total federal income tax expense
|  | 2,190 |  |  | 2,382 |  |  | Net income
Total reclassifications for the period |  | $ | 4,577 |  |  | 10,594 |  |  | Net income

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