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Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
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 |
First Quarter 2018 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 19,931 |  |  | 1,006 |  |  | 18,925 |
Components of other comprehensive loss: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during the period |  | (85,315 | ) |  | (17,917 | ) |  | (67,398 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (12 | ) |  | (2 | ) |  | (10 | )
Realized losses on disposals and OTTI of AFS securities |  | 4,549 |  |  | 955 |  |  | 3,594 |
Total unrealized losses on investment securities |  | (80,778 | ) |  | (16,964 | ) |  | (63,814 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 532 |  |  | 112 |  |  | 420 |
Total defined benefit pension and post-retirement plans |  | 532 |  |  | 112 |  |  | 420 |
Other comprehensive loss |  | (80,246 | ) |  | (16,852 | ) |  | (63,394 | )
Comprehensive loss |  | $ | (60,315 | ) |  | (15,846 | ) |  | (44,469 | )
Schedule of Components of Accumulated Other Comprehensive Income Net of Tax |
March 31, 2019 |  |  |  | Defined Benefit Pension and Post-Retirement Plans |  |
|  | Net Unrealized Gains (Losses) on Investment Securities |  |  | Total AOCI
($ in thousands) |  | OTTI Related |  | HTM Related |  | All Other |  | Investments Subtotal |  |
Balance, December 31, 2018 |  | $ | (71 | ) |  | 71 |  |  | 1,888 |  |  | 1,888 |  |  | (79,844 | ) |  | (77,956 | )
OCI before reclassifications |  | — |  |  | — |  |  | 81,313 |  |  | 81,313 |  |  | — |  |  | 81,313 |
Amounts reclassified from AOCI |  | — |  |  | (7 | ) |  | (851 | ) |  | (858 | ) |  | 525 |  |  | (333 | )
Net current period OCI |  | — |  |  | (7 | ) |  | 80,462 |  |  | 80,455 |  |  | 525 |  |  | 80,980 |
Balance, March 31, 2019 |  | $ | (71 | ) |  | 64 |  |  | 82,350 |  |  | 82,343 |  |  | (79,319 | ) |  | 3,024 |
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) | 2019 |  | 2018
HTM related |  |  |  |
Unrealized losses on HTM disposals | $ | — |  |  | 1 |  | Net realized and unrealized gains (losses)
Amortization of net unrealized gains on HTM securities | (9 | ) |  | (13 | ) | Net investment income earned
| (9 | ) |  | (12 | ) | Income before federal income tax
| 2 |  |  | 2 |  | Total federal income tax expense
| (7 | ) |  | (10 | ) | Net income
Realized (gains) losses on AFS and OTTI |  |  |  |
Realized (gains) losses on AFS disposals and OTTI | (1,077 | ) |  | 4,549 |  | Net realized and unrealized gains (losses)
| (1,077 | ) |  | 4,549 |  | Income before federal income tax
| 226 |  |  | (955 | ) | Total federal income tax expense
| (851 | ) |  | 3,594 |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |
Net actuarial loss | 145 |  |  | 112 |  | Loss and loss expense incurred
| 519 |  |  | 420 |  | Other insurance expenses
Total defined benefit pension and post-retirement life | 664 |  |  | 532 |  | Income before federal income tax
| (139 | ) |  | (112 | ) | Total federal income tax expense
| 525 |  |  | 420 |  | Net income
Total reclassifications for the period | $ | (333 | ) |  | 4,004 |  | Net income

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