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Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
First Quarter 2020 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 15,997 |  |  | 761 |  |  | 15,236 |
Components of other comprehensive loss: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during the period |  | (93,981 | ) |  | (19,736 | ) |  | (74,245 | )
Non-credit portion of OTTI recognized in OCI |  | (65,390 | ) |  | (13,732 | ) |  | (51,658 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | 25 |  |  | 5 |  |  | 20 |
Realized losses on disposals and intent-to-sell OTTI on AFS securities |  | 11,327 |  |  | 2,379 |  |  | 8,948 |
Credit loss expense recognized in OTTI |  | 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 | )
First Quarter 2019 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 73,694 |  |  | 12,346 |  |  | 61,348 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during the period |  | 102,926 |  |  | 21,613 |  |  | 81,313 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (9 | ) |  | (2 | ) |  | (7 | )
Realized gains on disposals and OTTI of AFS securities |  | (1,077 | ) |  | (226 | ) |  | (851 | )
Total unrealized gains on investment securities |  | 101,840 |  |  | 21,385 |  |  | 80,455 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 664 |  |  | 139 |  |  | 525 |
Total defined benefit pension and post-retirement plans |  | 664 |  |  | 139 |  |  | 525 |
Other comprehensive income |  | 102,504 |  |  | 21,524 |  |  | 80,980 |
Comprehensive income |  | $ | 176,198 |  |  | 33,870 |  |  | 142,328 |
Schedule of Components of Accumulated Other Comprehensive Income Net of Tax |
March 31, 2020 |  |  |  | Defined Benefit Pension and Post-Retirement Plans |  |
|  | Net Unrealized Gains (Losses) on Investment Securities |  |  | Total AOCI
($ in thousands) |  | OTTI Related 1 |  | HTM Related |  | All Other |  | Investments Subtotal |  |
Balance, December 31, 2019 |  | $ | (71 | ) |  | 25 |  |  | 170,439 |  |  | 170,393 |  |  | (88,643 | ) |  | 81,750 |
OCI before reclassifications |  | (51,658 | ) |  | — |  |  | (74,245 | ) |  | (125,903 | ) |  | — |  |  | (125,903 | )
Amounts reclassified from AOCI |  | 12,472 |  |  | 20 |  |  | 8,948 |  |  | 21,440 |  |  | 596 |  |  | 22,036 |
Net current period OCI |  | (39,186 | ) |  | 20 |  |  | (65,297 | ) |  | (104,463 | ) |  | 596 |  |  | (103,867 | )
Balance, March 31, 2020 |  | $ | (39,257 | ) |  | 45 |  |  | 105,142 |  |  | 65,930 |  |  | (88,047 | ) |  | (22,117 | )
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) | 2020 |  | 2019
HTM related |  |  |  |
Unrealized losses on HTM disposals | $ | 1 |  |  | — |  | Net realized and unrealized (losses) gains
Amortization of net unrealized losses (gains) on HTM securities | 24 |  |  | (9 | ) | Net investment income earned
| 25 |  |  | (9 | ) | Income before federal income tax
| (5 | ) |  | 2 |  | Total federal income tax expense
| 20 |  |  | (7 | ) | Net income
Net realized losses (gains) on disposals and intent-to-sell OTTI |  |  |  |
Net realized losses (gains) on disposals and intent-to-sell OTTI | 11,327 |  |  | (1,077 | ) | Net realized and unrealized (losses) gains
| 11,327 |  |  | (1,077 | ) | Income before federal income tax
| (2,379 | ) |  | 226 |  | Total federal income tax expense
| 8,948 |  |  | (851 | ) | Net income
OTTI related |  |  |  |
Credit loss expense recognized in OTTI | 15,787 |  |  | — |  | Net realized and unrealized (losses) gains
| 15,787 |  |  | — |  | Income before federal income tax
| (3,315 | ) |  | — |  | Total federal income tax expense
| 12,472 |  |  | — |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |
Net actuarial loss | 162 |  |  | 145 |  | Loss and loss expense incurred
| 592 |  |  | 519 |  | Other insurance expenses
Total defined benefit pension and post-retirement life | 754 |  |  | 664 |  | Income before federal income tax
| (158 | ) |  | (139 | ) | Total federal income tax expense
| 596 |  |  | 525 |  | Net income
Total reclassifications for the period | $ | 22,036 |  |  | (333 | ) | Net income

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