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Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
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 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 |
Third Quarter 2016 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 55,443 |  |  | 16,941 |  |  | 38,502 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during period |  | (12,992 | ) |  | (4,548 | ) |  | (8,444 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (13 | ) |  | (4 | ) |  | (9 | )
Realized gains on AFS securities |  | (3,684 | ) |  | (1,289 | ) |  | (2,395 | )
Total unrealized losses on investment securities |  | (16,689 | ) |  | (5,841 | ) |  | (10,848 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 1,615 |  |  | 565 |  |  | 1,050 |
Total defined benefit pension and post-retirement plans |  | 1,615 |  |  | 565 |  |  | 1,050 |
Other comprehensive loss |  | (15,074 | ) |  | (5,276 | ) |  | (9,798 | )
Comprehensive income |  | $ | 40,369 |  |  | 11,665 |  |  | 28,704 |
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 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 |
Nine Months 2016 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 169,629 |  |  | 50,494 |  |  | 119,135 |
Components of OCI: |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |
Unrealized holding gains during period |  | 108,420 |  |  | 37,947 |  |  | 70,473 |
Non-credit portion of OTTI recognized in OCI |  | (10 | ) |  | (4 | ) |  | (6 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (104 | ) |  | (36 | ) |  | (68 | )
Realized gains on AFS securities |  | (2,747 | ) |  | (961 | ) |  | (1,786 | )
Total unrealized gains on investment securities |  | 105,559 |  |  | 36,946 |  |  | 68,613 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |
Net actuarial loss |  | 4,648 |  |  | 1,627 |  |  | 3,021 |
Total defined benefit pension and post-retirement plans |  | 4,648 |  |  | 1,627 |  |  | 3,021 |
Other comprehensive income |  | 110,207 |  |  | 38,573 |  |  | 71,634 |
Comprehensive income |  | $ | 279,836 |  |  | 89,067 |  |  | 190,769 |
Schedule of Components of Accumulated Other Comprehensive Income |
September 30, 2017 |  |  |  | Defined Benefit Pension and Post-Retirement Plans |  |
|  | Net Unrealized Gains on Investment Securities |  |  | Total AOCI
($ in thousands) |  | OTTI Related |  | HTM Related |  | All Other |  | Investments Subtotal |  |
Balance, December 31, 2016 |  | $ | (150 | ) |  | 102 |  |  | 42,170 |  |  | 42,122 |  |  | (58,072 | ) |  | (15,950 | )
OCI before reclassifications |  | 23 |  |  | — |  |  | 50,961 |  |  | 50,984 |  |  | — |  |  | 50,984 |
Amounts reclassified from AOCI |  | 25 |  |  | (95 | ) |  | (4,638 | ) |  | (4,708 | ) |  | 989 |  |  | (3,719 | )
Net current period OCI |  | 48 |  |  | (95 | ) |  | 46,323 |  |  | 46,276 |  |  | 989 |  |  | 47,265 |
Balance, September 30, 2017 |  | $ | (102 | ) |  | 7 |  |  | 88,493 |  |  | 88,398 |  |  | (57,083 | ) |  | 31,315 |
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 Statement of Income
($ in thousands) | 2017 |  | 2016 |  | 2017 |  | 2016
OTTI related |  |  |  |  |  |  |  |
Non-credit OTTI on disposed securities | $ | 38 |  |  | — |  |  | 38 |  |  | — |  | Net realized 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 |  |  | 73 |  |  | 41 |  |  | 161 |  | Net realized gains
Amortization of net unrealized gains on HTM securities | (65 | ) |  | (86 | ) |  | (187 | ) |  | (265 | ) | Net investment income earned
| (54 | ) |  | (13 | ) |  | (146 | ) |  | (104 | ) | Income before federal income tax
| 19 |  |  | 4 |  |  | 51 |  |  | 36 |  | Total federal income tax expense
| (35 | ) |  | (9 | ) |  | (95 | ) |  | (68 | ) | Net income
Realized gains on AFS and OTTI |  |  |  |  |  |  |  |
Realized gains on AFS disposals and OTTI | (6,760 | ) |  | (3,684 | ) |  | (7,135 | ) |  | (2,747 | ) | Net realized gains
| (6,760 | ) |  | (3,684 | ) |  | (7,135 | ) |  | (2,747 | ) | Income before federal income tax
| 2,366 |  |  | 1,289 |  |  | 2,497 |  |  | 961 |  | Total federal income tax expense
| (4,394 | ) |  | (2,395 | ) |  | (4,638 | ) |  | (1,786 | ) | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |  |  |
Net actuarial loss | 110 |  |  | 351 |  |  | 331 |  |  | 1,009 |  | Losses and loss expenses incurred
| 397 |  |  | 1,264 |  |  | 1,191 |  |  | 3,639 |  | Policy acquisition costs
Total defined benefit pension and post-retirement life | 507 |  |  | 1,615 |  |  | 1,522 |  |  | 4,648 |  | Income before federal income tax
| (178 | ) |  | (565 | ) |  | (533 | ) |  | (1,627 | ) | Total federal income tax expense
| 329 |  |  | 1,050 |  |  | 989 |  |  | 3,021 |  | Net income
Total reclassifications for the period | $ | (4,075 | ) |  | (1,354 | ) |  | (3,719 | ) |  | 1,167 |  | Net income

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