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Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
First Quarter 2021 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 135,632 |  |  | 26,362 |  |  | 109,270 |
Components of OCI: |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |
Unrealized holding losses during the period |  | (103,308) |  |  | (21,695) |  |  | (81,613) |
Unrealized losses on securities with credit loss recognized in earnings |  | (11,320) |  |  | (2,377) |  |  | (8,943) |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (2) |  |  | — |  |  | (2) |
Net realized losses on disposals and losses on intent-to-sell AFS securities |  | 604 |  |  | 127 |  |  | 477 |
Credit loss expense |  | 4,997 |  |  | 1,049 |  |  | 3,948 |
Total unrealized losses on investment securities |  | (109,029) |  |  | (22,896) |  |  | (86,133) |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 693 |  |  | 146 |  |  | 547 |
Total defined benefit pension and post-retirement plans |  | 693 |  |  | 146 |  |  | 547 |
Other comprehensive loss |  | (108,336) |  |  | (22,750) |  |  | (85,586) |
Comprehensive income |  | $ | 27,296 |  |  | 3,612 |  |  | 23,684 |
First Quarter 2020 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 15,997 |  |  | 761 |  |  | 15,236 |
Components of OCI: |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |
Unrealized holding losses during the period |  | (93,981) |  |  | (19,736) |  |  | (74,245) |
Unrealized losses on securities with credit loss recognized in earnings |  | (65,390) |  |  | (13,732) |  |  | (51,658) |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | 25 |  |  | 5 |  |  | 20 |
Net realized losses on disposals and losses on intent-to-sell AFS securities |  | 11,327 |  |  | 2,379 |  |  | 8,948 |
Credit loss expense |  | 15,787 |  |  | 3,315 |  |  | 12,472 |
Total unrealized losses on investment securities |  | (132,232) |  |  | (27,769) |  |  | (104,463) |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 754 |  |  | 158 |  |  | 596 |
Total defined benefit pension and post-retirement plans |  | 754 |  |  | 158 |  |  | 596 |
Other comprehensive loss |  | (131,478) |  |  | (27,611) |  |  | (103,867) |
Comprehensive loss |  | $ | (115,481) |  |  | (26,850) |  |  | (88,631) |
Schedule of Components of Accumulated Other Comprehensive Income Net of Tax |
March 31, 2021 |  |  |  | Defined Benefit Pension and Post-Retirement Plans |  |
|  | Net Unrealized (Losses) Gains on Investment Securities |  |  | Total AOCI
($ in thousands) |  | Credit Loss Related 1 |  | HTM Related |  | All Other |  | Investments Subtotal |  |
Balance, December 31, 2020 |  | $ | (2,546) |  |  | 6 |  |  | 307,790 |  |  | 305,250 |  |  | (85,064) |  |  | 220,186 |
OCI before reclassifications |  | (8,943) |  |  | — |  |  | (81,613) |  |  | (90,556) |  |  | — |  |  | (90,556) |
Amounts reclassified from AOCI |  | 3,948 |  |  | (2) |  |  | 477 |  |  | 4,423 |  |  | 547 |  |  | 4,970 |
Net current period OCI |  | (4,995) |  |  | (2) |  |  | (81,136) |  |  | (86,133) |  |  | 547 |  |  | (85,586) |
Balance, March 31, 2021 |  | $ | (7,541) |  |  | 4 |  |  | 226,654 |  |  | 219,117 |  |  | (84,517) |  |  | 134,600 |
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) |  | 2021 |  | 2020 |  |  |  |
HTM related |  |  |  |  |  |  |  |  |
Unrealized (gains) losses on HTM disposals |  | $ | — |  |  | 1 |  |  |  |  |  | Net realized and unrealized investment gains (losses)
Amortization of net unrealized (gains) losses on HTM securities |  | (2) |  |  | 24 |  |  |  |  |  | Net investment income earned
|  | (2) |  |  | 25 |  |  |  |  |  | Income before federal income tax
|  | — |  |  | (5) |  |  |  |  |  | Total federal income tax expense
|  | (2) |  |  | 20 |  |  |  |  |  | Net income
Net realized losses on disposals and intent-to-sell AFS securities |  |  |  |  |  |  |  |  |
Net realized losses on disposals and intent-to-sell AFS securities |  | 604 |  |  | 11,327 |  |  |  |  |  | Net realized and unrealized investment gains (losses)
|  | 604 |  |  | 11,327 |  |  |  |  |  | Income before federal income tax
|  | (127) |  |  | (2,379) |  |  |  |  |  | Total federal income tax expense
|  | 477 |  |  | 8,948 |  |  |  |  |  | Net income
Credit loss related |  |  |  |  |  |  |  |  |
Credit loss expense |  | 4,997 |  |  | 15,787 |  |  |  |  |  | Net realized and unrealized investment gains (losses)
|  | 4,997 |  |  | 15,787 |  |  |  |  |  | Income before federal income tax
|  | (1,049) |  |  | (3,315) |  |  |  |  |  | Total federal income tax expense
|  | 3,948 |  |  | 12,472 |  |  |  |  |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 159 |  |  | 162 |  |  |  |  |  | Loss and loss expense incurred
|  | 534 |  |  | 592 |  |  |  |  |  | Other insurance expenses
Total defined benefit pension and post-retirement life |  | 693 |  |  | 754 |  |  |  |  |  | Income before federal income tax
|  | (146) |  |  | (158) |  |  |  |  |  | Total federal income tax expense
|  | 547 |  |  | 596 |  |  |  |  |  | Net income
Total reclassifications for the period |  | $ | 4,970 |  |  | 22,036 |  |  |  |  |  | Net income

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