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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
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 |
2018 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 211,721 |  |  | 32,782 |  |  | 178,939 |
Components of OCI: |  |  |  |  |  |
Unrealized (losses) gains on investment securities: |  |  |  |  |  |
Unrealized holding losses during the year |  | (123,145) |  |  | (25,861) |  |  | (97,284) |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | 110 |  |  | 23 |  |  | 87 |
Realized losses on disposals and OTTI of AFS securities |  | 39,641 |  |  | 8,325 |  |  | 31,316 |
Total unrealized losses on investment securities |  | (83,394) |  |  | (17,513) |  |  | (65,881) |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Net actuarial loss |  | (11,273) |  |  | (2,367) |  |  | (8,906) |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 2,127 |  |  | 447 |  |  | 1,680 |
Total defined benefit pension and post-retirement plans |  | (9,146) |  |  | (1,920) |  |  | (7,226) |
Other comprehensive loss |  | (92,540) |  |  | (19,433) |  |  | (73,107) |
Comprehensive income |  | $ | 119,181 |  |  | 13,349 |  |  | 105,832 |
Schedule of Components of Accumulated Other Comprehensive Income |
|  |  |  | Net Unrealized (Losses) Gains 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, 2018 |  |  |  | $ | (71) |  |  | 71 |  |  | 1,888 |  |  | 1,888 |  |  | (79,844) |  |  | (77,956) |
OCI before reclassifications |  |  |  | — |  |  | — |  |  | 168,021 |  |  | 168,021 |  |  | (10,898) |  |  | 157,123 |
Amounts reclassified from AOCI |  |  |  | — |  |  | (46) |  |  | 530 |  |  | 484 |  |  | 2,099 |  |  | 2,583 |
Net current period OCI |  |  |  | — |  |  | (46) |  |  | 168,551 |  |  | 168,505 |  |  | (8,799) |  |  | 159,706 |
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 |
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, 2020 |  | Year ended December 31, 2019 |  | Affected Line Item in the Consolidated Statements of Income
HTM related |  |  |  |  |  |
Unrealized gains on HTM disposals |  | $ | (16) |  |  | (46) |  |  | Net realized and unrealized investment (losses) gains
Amortization of net unrealized gains on HTM securities |  | (8) |  |  | (12) |  |  | Net investment income earned
|  | (24) |  |  | (58) |  |  | Income before federal income tax
|  | 5 |  |  | 12 |  |  | Total federal income tax expense
|  | (19) |  |  | (46) |  |  | Net income
Net realized losses on disposals and losses on intent-to-sell AFS securities |  |  |  |  |  |
Net realized losses on disposals and losses on intent-to-sell AFS securities |  | 5,376 |  |  | 671 |  |  | Net realized and unrealized investment (losses) gains
|  | 5,376 |  |  | 671 |  |  | Income before federal income tax
|  | (1,129) |  |  | (141) |  |  | Total federal income tax expense
|  | 4,247 |  |  | 530 |  |  | Net income
Credit loss related |  |  |  |  |  |
Credit loss expense |  | 5,042 |  |  | — |  |  | Net realized and unrealized investment (losses) gains
|  | 5,042 |  |  | — |  |  | Income before federal income tax
|  | (1,058) |  |  | — |  |  | Total federal income tax expense
|  | 3,984 |  |  | — |  |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |
Net actuarial loss |  | 647 |  |  | 582 |  |  | Loss and loss expense incurred
|  | 2,368 |  |  | 2,075 |  |  | Other insurance expenses
Total defined benefit pension and post-retirement life |  | 3,015 |  |  | 2,657 |  |  | Income before federal income tax
|  | (633) |  |  | (558) |  |  | Total federal income tax expense
|  | 2,382 |  |  | 2,099 |  |  | Net income
Total reclassifications for the period |  | $ | 10,594 |  |  | 2,583 |  |  | Net income

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