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Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
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 |
Third Quarter 2015 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 65,839 |  |  | 18,843 |  |  | 46,996 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during period |  | 8,371 |  |  | 2,929 |  |  | 5,442 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (97 | ) |  | (34 | ) |  | (63 | )
Realized gains on AFS securities |  | (305 | ) |  | (106 | ) |  | (199 | )
Total unrealized gains on investment securities |  | 7,969 |  |  | 2,789 |  |  | 5,180 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 1,709 |  |  | 599 |  |  | 1,110 |
Total defined benefit pension and post-retirement plans |  | 1,709 |  |  | 599 |  |  | 1,110 |
Other comprehensive income |  | 9,678 |  |  | 3,388 |  |  | 6,290 |
Comprehensive income |  | $ | 75,517 |  |  | 22,231 |  |  | 53,286 |
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 |
Nine Months 2015 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 168,894 |  |  | 48,422 |  |  | 120,472 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during period |  | (27,896 | ) |  | (9,764 | ) |  | (18,132 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (543 | ) |  | (190 | ) |  | (353 | )
Non-credit OTTI |  | 357 |  |  | 125 |  |  | 232 |
Realized gains on AFS securities |  | (16,778 | ) |  | (5,872 | ) |  | (10,906 | )
Total unrealized losses on investment securities |  | (44,860 | ) |  | (15,701 | ) |  | (29,159 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 5,127 |  |  | 1,795 |  |  | 3,332 |
Total defined benefit pension and post-retirement plans |  | 5,127 |  |  | 1,795 |  |  | 3,332 |
Other comprehensive loss |  | (39,733 | ) |  | (13,906 | ) |  | (25,827 | )
Comprehensive income |  | $ | 129,161 |  |  | 34,516 |  |  | 94,645 |
Schedule of Components of Accumulated Other Comprehensive Income |
September 30, 2016 |  |  |  | Defined Benefit Pension and Post-Retirement Plans |  |
|  | Net Unrealized Gain on Investment Securities |  |  | Total AOCI
($ in thousands) |  | OTTI Related |  | HTM Related |  | All Other |  | Investments Subtotal |  |
Balance, December 31, 2015 |  | $ | (282 | ) |  | 194 |  |  | 45,083 |  |  | 44,995 |  |  | (54,420 | ) |  | (9,425 | )
OCI before reclassifications |  | (6 | ) |  | — |  |  | 70,473 |  |  | 70,467 |  |  | — |  |  | 70,467 |
Amounts reclassified from AOCI |  | — |  |  | (68 | ) |  | (1,786 | ) |  | (1,854 | ) |  | 3,021 |  |  | 1,167 |
Net current period OCI |  | (6 | ) |  | (68 | ) |  | 68,687 |  |  | 68,613 |  |  | 3,021 |  |  | 71,634 |
Balance, September 30, 2016 |  | $ | (288 | ) |  | 126 |  |  | 113,770 |  |  | 113,608 |  |  | (51,399 | ) |  | 62,209 |
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) | 2016 |  | 2015 |  | 2016 |  | 2015
OTTI related |  |  |  |  |  |  |  |
Non-credit OTTI on disposed securities | $ | — |  |  | — |  |  | — |  |  | 357 |  | Net realized gains
| — |  |  | — |  |  | — |  |  | 357 |  | Income before federal income tax
| — |  |  | — |  |  | — |  |  | (125 | ) | Total federal income tax expense
| — |  |  | — |  |  | — |  |  | 232 |  | Net income
HTM related |  |  |  |  |  |  |  |
Unrealized losses on HTM disposals | 73 |  |  | 121 |  |  | 161 |  |  | 258 |  | Net realized gains
Amortization of net unrealized gains on HTM securities | (86 | ) |  | (218 | ) |  | (265 | ) |  | (801 | ) | Net investment income earned
| (13 | ) |  | (97 | ) |  | (104 | ) |  | (543 | ) | Income before federal income tax
| 4 |  |  | 34 |  |  | 36 |  |  | 190 |  | Total federal income tax expense
| (9 | ) |  | (63 | ) |  | (68 | ) |  | (353 | ) | Net income
Realized losses (gains) on AFS and OTTI |  |  |  |  |  |  |  |
Realized losses (gains) on AFS disposals and OTTI | (3,684 | ) |  | (305 | ) |  | (2,747 | ) |  | (16,778 | ) | Net realized gains
| (3,684 | ) |  | (305 | ) |  | (2,747 | ) |  | (16,778 | ) | Income before federal income tax
| 1,289 |  |  | 106 |  |  | 961 |  |  | 5,872 |  | Total federal income tax expense
| (2,395 | ) |  | (199 | ) |  | (1,786 | ) |  | (10,906 | ) | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |  |  |
Net actuarial loss | 351 |  |  | 371 |  |  | 1,009 |  |  | 1,114 |  | Loss and loss expense incurred
| 1,264 |  |  | 1,338 |  |  | 3,639 |  |  | 4,013 |  | Policy acquisition costs
Total defined benefit pension and post-retirement life | 1,615 |  |  | 1,709 |  |  | 4,648 |  |  | 5,127 |  | Income before federal income tax
| (565 | ) |  | (599 | ) |  | (1,627 | ) |  | (1,795 | ) | Total federal income tax expense
| 1,050 |  |  | 1,110 |  |  | 3,021 |  |  | 3,332 |  | Net income
Total reclassifications for the period | $ | (1,354 | ) |  | 848 |  |  | 1,167 |  |  | (7,695 | ) | Net income

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