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Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
Third Quarter 2018 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 67,130 |  |  | 11,695 |  |  | 55,435 |
Components of other comprehensive loss: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during period |  | (21,565 | ) |  | (4,529 | ) |  | (17,036 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (8 | ) |  | (2 | ) |  | (6 | )
Realized losses on disposals of AFS securities |  | 10,839 |  |  | 2,276 |  |  | 8,563 |
Total unrealized losses on investment securities |  | (10,734 | ) |  | (2,255 | ) |  | (8,479 | )
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 |  | (10,202 | ) |  | (2,143 | ) |  | (8,059 | )
Comprehensive income |  | $ | 56,928 |  |  | 9,552 |  |  | 47,376 |
Third Quarter 2017 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 67,315 |  |  | 20,597 |  |  | 46,718 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during period |  | 16,729 |  |  | 5,855 |  |  | 10,874 |
Non-credit portion of OTTI recognized in OCI |  | 30 |  |  | 11 |  |  | 19 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (54 | ) |  | (19 | ) |  | (35 | )
Non-credit OTTI |  | 38 |  |  | 13 |  |  | 25 |
Realized gains on disposals of AFS securities |  | (6,760 | ) |  | (2,366 | ) |  | (4,394 | )
Total unrealized gains on investment securities |  | 9,983 |  |  | 3,494 |  |  | 6,489 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 507 |  |  | 178 |  |  | 329 |
Total defined benefit pension and post-retirement plans |  | 507 |  |  | 178 |  |  | 329 |
Other comprehensive income |  | 10,490 |  |  | 3,672 |  |  | 6,818 |
Comprehensive income |  | $ | 77,805 |  |  | 24,269 |  |  | 53,536 |
Nine Months 2018 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 159,586 |  |  | 26,407 |  |  | 133,179 |
Components of other comprehensive loss: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during period |  | (130,873 | ) |  | (27,484 | ) |  | (103,389 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (28 | ) |  | (6 | ) |  | (22 | )
Realized losses on disposals of AFS securities |  | 18,258 |  |  | 3,834 |  |  | 14,424 |
Total unrealized losses on investment securities |  | (112,643 | ) |  | (23,656 | ) |  | (88,987 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |
Net actuarial loss |  | 1,595 |  |  | 335 |  |  | 1,260 |
Total defined benefit pension and post-retirement plans |  | 1,595 |  |  | 335 |  |  | 1,260 |
Other comprehensive loss |  | (111,048 | ) |  | (23,321 | ) |  | (87,727 | )
Comprehensive income |  | $ | 48,538 |  |  | 3,086 |  |  | 45,452 |
Nine Months 2017 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 193,818 |  |  | 55,234 |  |  | 138,584 |
Components of OCI: |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |
Unrealized holding gains during period |  | 78,401 |  |  | 27,440 |  |  | 50,961 |
Non-credit portion of OTTI recognized in OCI |  | 36 |  |  | 13 |  |  | 23 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (146 | ) |  | (51 | ) |  | (95 | )
Non-credit OTTI |  | 38 |  |  | 13 |  |  | 25 |
Realized gains on disposals of AFS securities |  | (7,135 | ) |  | (2,497 | ) |  | (4,638 | )
Total unrealized gains on investment securities |  | 71,194 |  |  | 24,918 |  |  | 46,276 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |
Net actuarial loss |  | 1,522 |  |  | 533 |  |  | 989 |
Total defined benefit pension and post-retirement plans |  | 1,522 |  |  | 533 |  |  | 989 |
Other comprehensive income |  | 72,716 |  |  | 25,451 |  |  | 47,265 |
Comprehensive income |  | $ | 266,534 |  |  | 80,685 |  |  | 185,849 |
Schedule of Components of Accumulated Other Comprehensive Income Net of Tax |
September 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 |  | — |  |  | — |  |  | (103,389 | ) |  | (103,389 | ) |  | — |  |  | (103,389 | )
Amounts reclassified from AOCI |  | — |  |  | (22 | ) |  | 14,424 |  |  | 14,402 |  |  | 1,260 |  |  | 15,662 |
Net current period OCI |  | — |  |  | (22 | ) |  | (88,965 | ) |  | (88,987 | ) |  | 1,260 |  |  | (87,727 | )
Balance, September 30, 2018 |  | $ | (71 | ) |  | (38 | ) |  | (21,109 | ) |  | (21,218 | ) |  | (71,358 | ) |  | (92,576 | )
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income |
| Quarter ended September 30, |  | Nine Months ended September 30, | Affected Line Item in the Unaudited Consolidated Statements of Income
($ in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
OTTI related |  |  |  |  |  |  |  |
Non-credit OTTI on disposed securities | $ | — |  |  | 38 |  |  | — |  |  | 38 |  | Net realized and unrealized (losses) gains
| — |  |  | 38 |  |  | — |  |  | 38 |  | Income before federal income tax
| — |  |  | (13 | ) |  | — |  |  | (13 | ) | Total federal income tax expense
| — |  |  | 25 |  |  | — |  |  | 25 |  | Net income
HTM related |  |  |  |  |  |  |  |
Unrealized losses on HTM disposals | $ | 11 |  |  | 11 |  |  | 5 |  |  | 41 |  | Net realized and unrealized (losses) gains
Amortization of net unrealized gains on HTM securities | (19 | ) |  | (65 | ) |  | (33 | ) |  | (187 | ) | Net investment income earned
| (8 | ) |  | (54 | ) |  | (28 | ) |  | (146 | ) | Income before federal income tax
| 2 |  |  | 19 |  |  | 6 |  |  | 51 |  | Total federal income tax expense
| (6 | ) |  | (35 | ) |  | (22 | ) |  | (95 | ) | Net income
Realized losses (gains) on AFS and OTTI |  |  |  |  |  |  |  |
Realized losses (gains) on AFS disposals and OTTI | 10,839 |  |  | (6,760 | ) |  | 18,258 |  |  | (7,135 | ) | Net realized and unrealized (losses) gains
| 10,839 |  |  | (6,760 | ) |  | 18,258 |  |  | (7,135 | ) | Income before federal income tax
| (2,276 | ) |  | 2,366 |  |  | (3,834 | ) |  | 2,497 |  | Total federal income tax expense
| 8,563 |  |  | (4,394 | ) |  | 14,424 |  |  | (4,638 | ) | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |  |  |
Net actuarial loss | 112 |  |  | 110 |  |  | 337 |  |  | 331 |  | Loss and loss expense incurred
| 420 |  |  | 397 |  |  | 1,258 |  |  | 1,191 |  | Other insurance expenses
Total defined benefit pension and post-retirement life | 532 |  |  | 507 |  |  | 1,595 |  |  | 1,522 |  | Income before federal income tax
| (112 | ) |  | (178 | ) |  | (335 | ) |  | (533 | ) | Total federal income tax expense
| 420 |  |  | 329 |  |  | 1,260 |  |  | 989 |  | Net income
Total reclassifications for the period | $ | 8,977 |  |  | (4,075 | ) |  | 15,662 |  |  | (3,719 | ) | Net income

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