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Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
Second Quarter 2015 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 46,765 |  |  | 12,997 |  |  | 33,768 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized (losses) gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during the period |  | (60,244 | ) |  | (21,084 | ) |  | (39,160 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (185 | ) |  | (65 | ) |  | (120 | )
Realized losses on AFS securities |  | 3,422 |  |  | 1,197 |  |  | 2,225 |
Net unrealized losses |  | (57,007 | ) |  | (19,952 | ) |  | (37,055 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 1,709 |  |  | 598 |  |  | 1,111 |
Defined benefit pension and post-retirement plans |  | 1,709 |  |  | 598 |  |  | 1,111 |
Other comprehensive loss |  | (55,298 | ) |  | (19,354 | ) |  | (35,944 | )
Comprehensive loss |  | $ | (8,533 | ) |  | (6,357 | ) |  | (2,176 | )
Second Quarter 2014 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 39,521 |  |  | 10,180 |  |  | 29,341 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during the period |  | 45,122 |  |  | 15,793 |  |  | 29,329 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (221 | ) |  | (77 | ) |  | (144 | )
Non-credit OTTI |  | 469 |  |  | 164 |  |  | 305 |
Realized gains on AFS securities |  | (5,008 | ) |  | (1,753 | ) |  | (3,255 | )
Net unrealized gains |  | 40,362 |  |  | 14,127 |  |  | 26,235 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 381 |  |  | 133 |  |  | 248 |
Defined benefit pension and post-retirement plans |  | 381 |  |  | 133 |  |  | 248 |
Other comprehensive income |  | 40,743 |  |  | 14,260 |  |  | 26,483 |
Comprehensive income |  | $ | 80,264 |  |  | 24,440 |  |  | 55,824 |
Six Months 2015 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 103,055 |  |  | 29,579 |  |  | 73,476 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized (losses) gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during the period |  | (36,267 | ) |  | (12,693 | ) |  | (23,574 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (446 | ) |  | (156 | ) |  | (290 | )
Non-credit OTTI |  | 357 |  |  | 125 |  |  | 232 |
Realized gains on AFS securities |  | (16,473 | ) |  | (5,766 | ) |  | (10,707 | )
Net unrealized losses |  | (52,829 | ) |  | (18,490 | ) |  | (34,339 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 3,418 |  |  | 1,196 |  |  | 2,222 |
Defined benefit pension and post-retirement plans |  | 3,418 |  |  | 1,196 |  |  | 2,222 |
Other comprehensive loss |  | (49,411 | ) |  | (17,294 | ) |  | (32,117 | )
Comprehensive income |  | $ | 53,644 |  |  | 12,285 |  |  | 41,359 |
Six Months 2014 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 64,605 |  |  | 17,290 |  |  | 47,315 |
Components of OCI: |  |  |  |  |  |  |
Unrealized gains (losses) on investment securities: |  |  |  |  |  |  |
Unrealized holding gains during the period |  | 78,086 |  |  | 27,331 |  |  | 50,755 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (677 | ) |  | (237 | ) |  | (440 | )
Non-credit OTTI |  | 469 |  |  | 164 |  |  | 305 |
Realized gains on AFS securities |  | (12,237 | ) |  | (4,283 | ) |  | (7,954 | )
Net unrealized gains |  | 65,641 |  |  | 22,975 |  |  | 42,666 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 761 |  |  | 266 |  |  | 495 |
Defined benefit pension and post-retirement plans |  | 761 |  |  | 266 |  |  | 495 |
Other comprehensive income |  | 66,402 |  |  | 23,241 |  |  | 43,161 |
Comprehensive income |  | $ | 131,007 |  |  | 40,531 |  |  | 90,476 |
Schedule of Components of Accumulated Other Comprehensive Income |
June 30, 2015 |  |  |  |  |  |
|  | Net Unrealized (Loss) Gain on Investment Securities |  | Defined Benefit Pension and Post-Retirement Plans |  | Total Accumulated Other Comprehensive Income (Loss)
($ 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 |  | — |  |  | — |  |  | (23,574 | ) |  | (23,574 | ) |  | — |  |  | (23,574 | )
Amounts reclassified from AOCI |  | 232 |  |  | (290 | ) |  | (10,707 | ) |  | (10,765 | ) |  | 2,222 |  |  | (8,543 | )
Net current period OCI |  | 232 |  |  | (290 | ) |  | (34,281 | ) |  | (34,339 | ) |  | 2,222 |  |  | (32,117 | )
Balance, June 30, 2015 |  | $ | (282 | ) |  | 333 |  |  | 46,003 |  |  | 46,054 |  |  | (58,383 | ) |  | (12,329 | )
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income |
| Quarter ended June 30, |  | Six Months ended June 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 | $ | — |  |  | 469 |  |  | 357 |  |  | 469 |  | Net realized (losses) gains
| — |  |  | 469 |  |  | 357 |  |  | 469 |  | Income before federal income tax
| — |  |  | (164 | ) |  | (125 | ) |  | (164 | ) | Total federal income tax expense
| — |  |  | 305 |  |  | 232 |  |  | 305 |  | Net income
HTM related |  |  |  |  |  |  |  |
Unrealized losses on HTM disposals | 87 |  |  | 51 |  |  | 137 |  |  | 75 |  | Net realized (losses) gains
Amortization of net unrealized gains on HTM securities | (272 | ) |  | (272 | ) |  | (583 | ) |  | (752 | ) | Net investment income earned
| (185 | ) |  | (221 | ) |  | (446 | ) |  | (677 | ) | Income before federal income tax
| 65 |  |  | 77 |  |  | 156 |  |  | 237 |  | Total federal income tax expense
| (120 | ) |  | (144 | ) |  | (290 | ) |  | (440 | ) | Net income
Realized gains and losses on AFS and OTTI |  |  |  |  |  |  |  |
Realized losses (gains) on AFS disposals and OTTI | 3,422 |  |  | (5,008 | ) |  | (16,473 | ) |  | (12,237 | ) | Net realized (losses) gains
| 3,422 |  |  | (5,008 | ) |  | (16,473 | ) |  | (12,237 | ) | Income before federal income tax
| (1,197 | ) |  | 1,753 |  |  | 5,766 |  |  | 4,283 |  | Total federal income tax expense
| 2,225 |  |  | (3,255 | ) |  | (10,707 | ) |  | (7,954 | ) | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |  |  |
Net actuarial loss | 372 |  |  | 88 |  |  | 743 |  |  | 175 |  | Loss and loss expense incurred
| 1,337 |  |  | 293 |  |  | 2,675 |  |  | 586 |  | Policy acquisition costs
Total defined benefit pension and post-retirement life | 1,709 |  |  | 381 |  |  | 3,418 |  |  | 761 |  | Income before federal income tax
| (598 | ) |  | (133 | ) |  | (1,196 | ) |  | (266 | ) | Total federal income tax expense
| 1,111 |  |  | 248 |  |  | 2,222 |  |  | 495 |  | Net income
Total reclassifications for the period | $ | 3,216 |  |  | (2,846 | ) |  | (8,543 | ) |  | (7,594 | ) | Net income

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