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Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
Second Quarter 2019 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 90,225 |  |  | 17,959 |  |  | 72,266 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during the period |  | 83,546 |  |  | 17,544 |  |  | 66,002 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (21 | ) |  | (4 | ) |  | (17 | )
Realized gains on disposals and OTTI of AFS securities |  | (1,300 | ) |  | (273 | ) |  | (1,027 | )
Total unrealized gains on investment securities |  | 82,225 |  |  | 17,267 |  |  | 64,958 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 664 |  |  | 140 |  |  | 524 |
Total defined benefit pension and post-retirement plans |  | 664 |  |  | 140 |  |  | 524 |
Other comprehensive income |  | 82,889 |  |  | 17,407 |  |  | 65,482 |
Comprehensive income |  | $ | 173,114 |  |  | 35,366 |  |  | 137,748 |
Second Quarter 2018 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 72,525 |  |  | 13,706 |  |  | 58,819 |
Components of other comprehensive loss: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during the period |  | (23,993 | ) |  | (5,038 | ) |  | (18,955 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (8 | ) |  | (2 | ) |  | (6 | )
Realized losses on disposals and OTTI of AFS securities |  | 2,870 |  |  | 603 |  |  | 2,267 |
Total unrealized losses on investment securities |  | (21,131 | ) |  | (4,437 | ) |  | (16,694 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 531 |  |  | 111 |  |  | 420 |
Total defined benefit pension and post-retirement plans |  | 531 |  |  | 111 |  |  | 420 |
Other comprehensive loss |  | (20,600 | ) |  | (4,326 | ) |  | (16,274 | )
Comprehensive income |  | $ | 51,925 |  |  | 9,380 |  |  | 42,545 |
Six Months 2019 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 163,919 |  |  | 30,305 |  |  | 133,614 |
Components of OCI: |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |
Unrealized holding gains during the period |  | 186,472 |  |  | 39,157 |  |  | 147,315 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (30 | ) |  | (6 | ) |  | (24 | )
Realized gains on disposals and OTTI of AFS securities |  | (2,377 | ) |  | (499 | ) |  | (1,878 | )
Total unrealized gains on investment securities |  | 184,065 |  |  | 38,652 |  |  | 145,413 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |
Net actuarial loss |  | 1,328 |  |  | 279 |  |  | 1,049 |
Total defined benefit pension and post-retirement plans |  | 1,328 |  |  | 279 |  |  | 1,049 |
Other comprehensive income |  | 185,393 |  |  | 38,931 |  |  | 146,462 |
Comprehensive income |  | $ | 349,312 |  |  | 69,236 |  |  | 280,076 |
Six Months 2018 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 92,456 |  |  | 14,712 |  |  | 77,744 |
Components of other comprehensive loss: |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |
Unrealized holding losses during the period |  | (109,308 | ) |  | (22,955 | ) |  | (86,353 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (20 | ) |  | (4 | ) |  | (16 | )
Realized losses on disposals and OTTI of AFS securities |  | 7,419 |  |  | 1,558 |  |  | 5,861 |
Total unrealized losses on investment securities |  | (101,909 | ) |  | (21,401 | ) |  | (80,508 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |
Net actuarial loss |  | 1,063 |  |  | 223 |  |  | 840 |
Total defined benefit pension and post-retirement plans |  | 1,063 |  |  | 223 |  |  | 840 |
Other comprehensive loss |  | (100,846 | ) |  | (21,178 | ) |  | (79,668 | )
Comprehensive loss |  | $ | (8,390 | ) |  | (6,466 | ) |  | (1,924 | )
Schedule of Components of Accumulated Other Comprehensive Income Net of Tax |
June 30, 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 |  | — |  |  | — |  |  | 147,315 |  |  | 147,315 |  |  | — |  |  | 147,315 |
Amounts reclassified from AOCI |  | — |  |  | (24 | ) |  | (1,878 | ) |  | (1,902 | ) |  | 1,049 |  |  | (853 | )
Net current period OCI |  | — |  |  | (24 | ) |  | 145,437 |  |  | 145,413 |  |  | 1,049 |  |  | 146,462 |
Balance, June 30, 2019 |  | $ | (71 | ) |  | 47 |  |  | 147,325 |  |  | 147,301 |  |  | (78,795 | ) |  | 68,506 |
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income |
| Quarter ended June 30, |  | Six Months ended June 30, | Affected Line Item in the Unaudited Consolidated Statements of Income
($ in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
HTM related |  |  |  |  |  |  |  |
Unrealized losses on HTM disposals | $ | (9 | ) |  | (7 | ) |  | (9 | ) |  | (6 | ) | Net realized and unrealized gains (losses)
Amortization of net unrealized gains on HTM securities | (12 | ) |  | (1 | ) |  | (21 | ) |  | (14 | ) | Net investment income earned
| (21 | ) |  | (8 | ) |  | (30 | ) |  | (20 | ) | Income before federal income tax
| 4 |  |  | 2 |  |  | 6 |  |  | 4 |  | Total federal income tax expense
| (17 | ) |  | (6 | ) |  | (24 | ) |  | (16 | ) | Net income
Realized (gains) losses on AFS and OTTI |  |  |  |  |  |  |  |
Realized (gains) losses on AFS disposals and OTTI | (1,300 | ) |  | 2,870 |  |  | (2,377 | ) |  | 7,419 |  | Net realized and unrealized gains (losses)
| (1,300 | ) |  | 2,870 |  |  | (2,377 | ) |  | 7,419 |  | Income before federal income tax
| 273 |  |  | (603 | ) |  | 499 |  |  | (1,558 | ) | Total federal income tax expense
| (1,027 | ) |  | 2,267 |  |  | (1,878 | ) |  | 5,861 |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |  |  |
Net actuarial loss | 145 |  |  | 113 |  |  | 290 |  |  | 225 |  | Loss and loss expense incurred
| 519 |  |  | 418 |  |  | 1,038 |  |  | 838 |  | Other insurance expenses
Total defined benefit pension and post-retirement life | 664 |  |  | 531 |  |  | 1,328 |  |  | 1,063 |  | Income before federal income tax
| (140 | ) |  | (111 | ) |  | (279 | ) |  | (223 | ) | Total federal income tax expense
| 524 |  |  | 420 |  |  | 1,049 |  |  | 840 |  | Net income
Total reclassifications for the period | $ | (520 | ) |  | 2,681 |  |  | (853 | ) |  | 6,685 |  | Net income

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