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Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
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 period |  | (23,993 | ) |  | (5,038 | ) |  | (18,955 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (8 | ) |  | (2 | ) |  | (6 | )
Realized losses on disposals 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 |
Second Quarter 2017 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 58,929 |  |  | 17,503 |  |  | 41,426 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during period |  | 35,887 |  |  | 12,561 |  |  | 23,326 |
Non-credit portion of OTTI recognized in OCI |  | 6 |  |  | 2 |  |  | 4 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (43 | ) |  | (15 | ) |  | (28 | )
Realized gains on disposals of AFS securities |  | (1,885 | ) |  | (660 | ) |  | (1,225 | )
Total unrealized gains on investment securities |  | 33,965 |  |  | 11,888 |  |  | 22,077 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 508 |  |  | 178 |  |  | 330 |
Total defined benefit pension and post-retirement plans |  | 508 |  |  | 178 |  |  | 330 |
Other comprehensive income |  | 34,473 |  |  | 12,066 |  |  | 22,407 |
Comprehensive income |  | $ | 93,402 |  |  | 29,569 |  |  | 63,833 |
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 period |  | (109,308 | ) |  | (22,955 | ) |  | (86,353 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (20 | ) |  | (4 | ) |  | (16 | )
Realized losses on disposals 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 | )
Six Months 2017 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 126,503 |  |  | 34,637 |  |  | 91,866 |
Components of OCI: |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |
Unrealized holding gains during period |  | 61,672 |  |  | 21,585 |  |  | 40,087 |
Non-credit portion of OTTI recognized in OCI |  | 6 |  |  | 2 |  |  | 4 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (92 | ) |  | (32 | ) |  | (60 | )
Realized gains on disposals of AFS securities |  | (375 | ) |  | (131 | ) |  | (244 | )
Total unrealized gains on investment securities |  | 61,211 |  |  | 21,424 |  |  | 39,787 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |
Net actuarial loss |  | 1,015 |  |  | 355 |  |  | 660 |
Total defined benefit pension and post-retirement plans |  | 1,015 |  |  | 355 |  |  | 660 |
Other comprehensive income |  | 62,226 |  |  | 21,779 |  |  | 40,447 |
Comprehensive income |  | $ | 188,729 |  |  | 56,416 |  |  | 132,313 |
Schedule of Components of Accumulated Other Comprehensive Income Net of Tax |
June 30, 2018 |  |  |  | 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, 2017 |  | $ | (59 | ) |  | (14 | ) |  | 80,648 |  |  | 80,575 |  |  | (60,405 | ) |  | 20,170 |
Cumulative effect adjustments |  | (12 | ) |  | (2 | ) |  | (12,792 | ) |  | (12,806 | ) |  | (12,213 | ) |  | (25,019 | )
Balance, December 31, 2017 as adjusted |  | (71 | ) |  | (16 | ) |  | 67,856 |  |  | 67,769 |  |  | (72,618 | ) |  | (4,849 | )
OCI before reclassifications |  | — |  |  | — |  |  | (86,353 | ) |  | (86,353 | ) |  | — |  |  | (86,353 | )
Amounts reclassified from AOCI |  | — |  |  | (16 | ) |  | 5,861 |  |  | 5,845 |  |  | 840 |  |  | 6,685 |
Net current period OCI |  | — |  |  | (16 | ) |  | (80,492 | ) |  | (80,508 | ) |  | 840 |  |  | (79,668 | )
Balance, June 30, 2018 |  | $ | (71 | ) |  | (32 | ) |  | (12,636 | ) |  | (12,739 | ) |  | (71,778 | ) |  | (84,517 | )
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) | 2018 |  | 2017 |  | 2018 |  | 2017
HTM related |  |  |  |  |  |  |  |
Unrealized losses on HTM disposals | $ | (7 | ) |  | 17 |  |  | (6 | ) |  | 30 |  | Net realized and unrealized (losses) gains
Amortization of net unrealized gains on HTM securities | (1 | ) |  | (60 | ) |  | (14 | ) |  | (122 | ) | Net investment income earned
| (8 | ) |  | (43 | ) |  | (20 | ) |  | (92 | ) | Income before federal income tax
| 2 |  |  | 15 |  |  | 4 |  |  | 32 |  | Total federal income tax expense
| (6 | ) |  | (28 | ) |  | (16 | ) |  | (60 | ) | Net income
Realized losses (gains) on AFS and OTTI |  |  |  |  |  |  |  |
Realized losses (gains) on AFS disposals and OTTI | 2,870 |  |  | (1,885 | ) |  | 7,419 |  |  | (375 | ) | Net realized and unrealized (losses) gains
| 2,870 |  |  | (1,885 | ) |  | 7,419 |  |  | (375 | ) | Income before federal income tax
| (603 | ) |  | 660 |  |  | (1,558 | ) |  | 131 |  | Total federal income tax expense
| 2,267 |  |  | (1,225 | ) |  | 5,861 |  |  | (244 | ) | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |  |  |
Net actuarial loss | 113 |  |  | 111 |  |  | 225 |  |  | 221 |  | Loss and loss expense incurred
| 418 |  |  | 397 |  |  | 838 |  |  | 794 |  | Other insurance expenses
Total defined benefit pension and post-retirement life | 531 |  |  | 508 |  |  | 1,063 |  |  | 1,015 |  | Income before federal income tax
| (111 | ) |  | (178 | ) |  | (223 | ) |  | (355 | ) | Total federal income tax expense
| 420 |  |  | 330 |  |  | 840 |  |  | 660 |  | Net income
Total reclassifications for the period | $ | 2,681 |  |  | (923 | ) |  | 6,685 |  |  | 356 |  | Net income

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