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Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Components of Comprehensive Income-Gross and Net of Tax |
Nine Months 2013 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 108,019 |  |  | 26,936 |  |  | 81,083 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during the period |  | (77,810 | ) |  | (27,234 | ) |  | (50,576 | )
Non-credit OTTI recognized in OCI |  | 77 |  |  | 27 |  |  | 50 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (1,803 | ) |  | (631 | ) |  | (1,172 | )
Non-credit OTTI |  | 14 |  |  | 5 |  |  | 9 |
Realized gains on AFS securities |  | (24,780 | ) |  | (8,673 | ) |  | (16,107 | )
Net unrealized losses |  | (104,302 | ) |  | (36,506 | ) |  | (67,796 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Net actuarial gain |  | 44,000 |  |  | 15,400 |  |  | 28,600 |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 3,419 |  |  | 1,197 |  |  | 2,222 |
Prior service cost |  | 10 |  |  | 4 |  |  | 6 |
Curtailment expense |  | 16 |  |  | 5 |  |  | 11 |
Defined benefit pension and post-retirement plans |  | 47,445 |  |  | 16,606 |  |  | 30,839 |
Other comprehensive loss |  | (56,857 | ) |  | (19,900 | ) |  | (36,957 | )
Comprehensive income |  | $ | 51,162 |  |  | 7,036 |  |  | 44,126 |
Nine Months 2012 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 42,813 |  |  | 6,158 |  |  | 36,655 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during the period |  | 64,273 |  |  | 22,496 |  |  | 41,777 |
Non-credit OTTI recognized in OCI |  | 2,241 |  |  | 784 |  |  | 1,457 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (1,901 | ) |  | (665 | ) |  | (1,236 | )
Non-credit OTTI |  | 272 |  |  | 95 |  |  | 177 |
Realized gains on AFS securities |  | (3,451 | ) |  | (1,208 | ) |  | (2,243 | )
Net unrealized gains |  | 61,434 |  |  | 21,502 |  |  | 39,932 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 4,172 |  |  | 1,460 |  |  | 2,712 |
Prior service cost |  | 113 |  |  | 40 |  |  | 73 |
Defined benefit pension and post-retirement plans |  | 4,285 |  |  | 1,500 |  |  | 2,785 |
Other comprehensive income |  | 65,719 |  |  | 23,002 |  |  | 42,717 |
Comprehensive income |  | $ | 108,532 |  |  | 29,160 |  |  | 79,372 |
Third Quarter 2013 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 44,485 |  |  | 11,832 |  |  | 32,653 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized gains during the period |  | 9,820 |  |  | 3,437 |  |  | 6,383 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (472 | ) |  | (165 | ) |  | (307 | )
Non-credit OTTI |  | 1 |  |  | — |  |  | 1 |
Realized gains on AFS securities |  | (13,516 | ) |  | (4,731 | ) |  | (8,785 | )
Net unrealized losses |  | (4,167 | ) |  | (1,459 | ) |  | (2,708 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 790 |  |  | 277 |  |  | 513 |
Defined benefit pension and post-retirement plans |  | 790 |  |  | 277 |  |  | 513 |
Other comprehensive loss |  | (3,377 | ) |  | (1,182 | ) |  | (2,195 | )
Comprehensive income |  | $ | 41,108 |  |  | 10,650 |  |  | 30,458 |
Third Quarter 2012 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 20,314 |  |  | 2,040 |  |  | 18,274 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during the period |  | 36,620 |  |  | 12,817 |  |  | 23,803 |
Non-credit OTTI recognized in OCI |  | 2,023 |  |  | 708 |  |  | 1,315 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (336 | ) |  | (117 | ) |  | (219 | )
Non-credit OTTI |  | 9 |  |  | 3 |  |  | 6 |
Realized losses on AFS securities |  | 1,037 |  |  | 363 |  |  | 674 |
Net unrealized gains |  | 39,353 |  |  | 13,774 |  |  | 25,579 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 1,391 |  |  | 487 |  |  | 904 |
Prior service cost |  | 38 |  |  | 14 |  |  | 24 |
Defined benefit pension and post-retirement plans |  | 1,429 |  |  | 501 |  |  | 928 |
Other comprehensive income |  | 40,782 |  |  | 14,275 |  |  | 26,507 |
Comprehensive income |  | $ | 61,096 |  |  | 16,315 |  |  | 44,781 |
Components of Accumulated Other Comprehensive Income |
September 30, 2013 |  | Net Unrealized (Loss) Gain on Investment Securities |  |  |  |
($ in thousands) |  | OTTI Related |  | HTM Related |  | All Other |  | Investments Subtotal |  | Defined Benefit Pension and Post-Retirement Plans |  | Total AOCI
Balance, December 31, 2012 |  | $ | (1,658 | ) |  | 2,594 |  |  | 121,391 |  |  | 122,327 |  |  | (68,287 | ) |  | 54,040 |
OCI before reclassifications |  | 50 |  |  | (103 | ) |  | (50,473 | ) |  | (50,526 | ) |  | 28,600 |  |  | (21,926 | )
Amounts reclassified from AOCI |  | 9 |  |  | (1,172 | ) |  | (16,107 | ) |  | (17,270 | ) |  | 2,239 |  |  | (15,031 | )
Net current period OCI |  | 59 |  |  | (1,275 | ) |  | (66,580 | ) |  | (67,796 | ) |  | 30,839 |  |  | (36,957 | )
Balance, September 30, 2013 |  | $ | (1,599 | ) |  | 1,319 |  |  | 54,811 |  |  | 54,531 |  |  | (37,448 | ) |  | 17,083 |
Reclassification Out Of Accumulated Other Comprehensive Income |
| Amount Reclassified from AOCI |  | Affected Line Item in the Unaudited Consolidated Statement of Income
($ in thousands) | Quarter ended September 30, 2013 |  | Nine Months ended September 30, 2013 |
OTTI related |  |  |  |  |
Amortization of non-credit OTTI losses on HTM securities |  |  |  |  |
| $ | 1 |  |  | 14 |  |  | Net investment income earned
| 1 |  |  | 14 |  |  | Income (loss) from continuing operations, before federal income tax
| — |  |  | (5 | ) |  | Total federal income tax expense (benefit)
| 1 |  |  | 9 |  |  | Net income
HTM related |  |  |  |  |
Unrealized gains and losses on HTM disposals | (19 | ) |  | (170 | ) |  | Net realized investment gains
Amortization of net unrealized gains on HTM securities | (453 | ) |  | (1,633 | ) |  | Net investment income earned
| (472 | ) |  | (1,803 | ) |  | Income (loss) from continuing operations, before federal income tax
| 165 |  |  | 631 |  |  | Total federal income tax expense (benefit)
| (307 | ) |  | (1,172 | ) |  | Net income
Realized gains and losses on AFS |  |  |  |  |
Realized gains and losses on AFS disposals | (13,516 | ) |  | (24,780 | ) |  | Net realized investments gains
| (13,516 | ) |  | (24,780 | ) |  | Income (loss) from continuing operations, before federal income tax
| 4,731 |  |  | 8,673 |  |  | Total federal income tax expense (benefit)
| (8,785 | ) |  | (16,107 | ) |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |
Net actuarial loss | 159 |  |  | 717 |  |  | Loss and loss expense incurred
| 631 |  |  | 2,702 |  |  | Policy acquisition costs
| 790 |  |  | 3,419 |  |  | Income (loss) from continuing operations, before federal income tax
Prior service cost | — |  |  | 7 |  |  | Loss and loss expense incurred
| — |  |  | 3 |  |  | Policy acquisition costs
| — |  |  | 10 |  |  | Income (loss) from continuing operations, before federal income tax
Curtailment expense | — |  |  | 16 |  |  | Policy acquisition costs
| — |  |  | 16 |  |  | Income (loss) from continuing operations, before federal income tax
Total defined benefit pension and post-retirement life | 790 |  |  | 3,445 |  |  | Income (loss) from continuing operations, before federal income tax
| (277 | ) |  | (1,206 | ) |  | Total federal income tax expense (benefit)
| 513 |  |  | 2,239 |  |  | Net income
Total reclassifications for the period | $ | (8,578 | ) |  | $ | (15,031 | ) |  | Net income

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