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Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
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 the 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 | )
Net unrealized gains |  | 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 |
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 |
Third Quarter 2014 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 75,326 |  |  | 22,164 |  |  | 53,162 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during the period |  | (13,831 | ) |  | (4,843 | ) |  | (8,988 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (373 | ) |  | (130 | ) |  | (243 | )
Non-credit OTTI |  | 1,200 |  |  | 420 |  |  | 780 |
Realized gains on AFS securities |  | (16,435 | ) |  | (5,752 | ) |  | (10,683 | )
Net unrealized losses |  | (29,439 | ) |  | (10,305 | ) |  | (19,134 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 381 |  |  | 134 |  |  | 247 |
Defined benefit pension and post-retirement plans |  | 381 |  |  | 134 |  |  | 247 |
Other comprehensive loss |  | (29,058 | ) |  | (10,171 | ) |  | (18,887 | )
Comprehensive income |  | $ | 46,268 |  |  | 11,993 |  |  | 34,275 |
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 the 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 | )
Net unrealized losses |  | (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 |
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 |
Nine Months 2014 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 139,931 |  |  | 39,454 |  |  | 100,477 |
Components of OCI: |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |
Unrealized holding gains during the period |  | 64,255 |  |  | 22,488 |  |  | 41,767 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (1,050 | ) |  | (367 | ) |  | (683 | )
Non-credit OTTI |  | 1,669 |  |  | 584 |  |  | 1,085 |
Realized gains on AFS securities |  | (28,672 | ) |  | (10,035 | ) |  | (18,637 | )
Net unrealized gains |  | 36,202 |  |  | 12,670 |  |  | 23,532 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 1,142 |  |  | 400 |  |  | 742 |
Defined benefit pension and post-retirement plans |  | 1,142 |  |  | 400 |  |  | 742 |
Other comprehensive income |  | 37,344 |  |  | 13,070 |  |  | 24,274 |
Comprehensive income |  | $ | 177,275 |  |  | 52,524 |  |  | 124,751 |
Schedule of Components of Accumulated Other Comprehensive Income |
September 30, 2015 |  |  |  |  |  |
|  | Net Unrealized (Loss) Gain on Investment Securities |  | Defined Benefit Pension and Post-Retirement Plans |  | Total AOCI
($ in thousands) |  | OTTI Related |  | HTM Related |  | All Other |  | Investments Subtotal |  |
Balance, December 31, 2014 |  | $ | (514 | ) |  | 623 |  |  | 80,284 |  |  | 80,393 |  |  | (60,605 | ) |  | 19,788 |
OCI before reclassifications |  | — |  |  | — |  |  | (18,132 | ) |  | (18,132 | ) |  | — |  |  | (18,132 | )
Amounts reclassified from AOCI |  | 232 |  |  | (353 | ) |  | (10,906 | ) |  | (11,027 | ) |  | 3,332 |  |  | (7,695 | )
Net current period OCI |  | 232 |  |  | (353 | ) |  | (29,038 | ) |  | (29,159 | ) |  | 3,332 |  |  | (25,827 | )
Balance, September 30, 2015 |  | $ | (282 | ) |  | 270 |  |  | 51,246 |  |  | 51,234 |  |  | (57,273 | ) |  | (6,039 | )
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income |
| Quarter ended September 30, |  | Nine Months ended September 30, |
($ in thousands) | 2015 |  | 2014 |  | 2015 |  | 2014 | Affected Line Item in the Unaudited Consolidated Statement of Income
OTTI related |  |  |  |  |  |  |  |
Non-credit OTTI on disposed securities | $ | — |  |  | 1,200 |  |  | 357 |  |  | 1,669 |  | Net realized gains
| — |  |  | 1,200 |  |  | 357 |  |  | 1,669 |  | Income before federal income tax
| — |  |  | (420 | ) |  | (125 | ) |  | (584 | ) | Total federal income tax expense
| — |  |  | 780 |  |  | 232 |  |  | 1,085 |  | Net income
HTM related |  |  |  |  |  |  |  |
Unrealized losses on HTM disposals | 121 |  |  | 12 |  |  | 258 |  |  | 87 |  | Net realized gains
Amortization of net unrealized gains on HTM securities | (218 | ) |  | (385 | ) |  | (801 | ) |  | (1,137 | ) | Net investment income earned
| (97 | ) |  | (373 | ) |  | (543 | ) |  | (1,050 | ) | Income before federal income tax
| 34 |  |  | 130 |  |  | 190 |  |  | 367 |  | Total federal income tax expense
| (63 | ) |  | (243 | ) |  | (353 | ) |  | (683 | ) | Net income
Realized gains on AFS and OTTI |  |  |  |  |  |  |  |
Realized gains on AFS disposals and OTTI | (305 | ) |  | (16,435 | ) |  | (16,778 | ) |  | (28,672 | ) | Net realized gains
| (305 | ) |  | (16,435 | ) |  | (16,778 | ) |  | (28,672 | ) | Income before federal income tax
| 106 |  |  | 5,752 |  |  | 5,872 |  |  | 10,035 |  | Total federal income tax expense
| (199 | ) |  | (10,683 | ) |  | (10,906 | ) |  | (18,637 | ) | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |  |  |
Net actuarial loss | 371 |  |  | 88 |  |  | 1,114 |  |  | 263 |  | Loss and loss expense incurred
| 1,338 |  |  | 293 |  |  | 4,013 |  |  | 879 |  | Policy acquisition costs
Total defined benefit pension and post-retirement life | 1,709 |  |  | 381 |  |  | 5,127 |  |  | 1,142 |  | Income before federal income tax
| (599 | ) |  | (134 | ) |  | (1,795 | ) |  | (400 | ) | Total federal income tax expense
| 1,110 |  |  | 247 |  |  | 3,332 |  |  | 742 |  | Net income
Total reclassifications for the period | $ | 848 |  |  | (9,899 | ) |  | (7,695 | ) |  | (17,493 | ) | Net income

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