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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
2015 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 232,692 |  |  | 66,831 |  |  | 165,861 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during the year |  | (40,221 | ) |  | (14,078 | ) |  | (26,143 | )
Amounts reclassified into net income: |  |  |  |  |  |  |
HTM securities |  | (580 | ) |  | (203 | ) |  | (377 | )
Non-credit OTTI |  | 357 |  |  | 125 |  |  | 232 |
Realized gains on AFS securities |  | (14,016 | ) |  | (4,906 | ) |  | (9,110 | )
Net unrealized losses |  | (54,460 | ) |  | (19,062 | ) |  | (35,398 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Net actuarial gain |  | 2,438 |  |  | 853 |  |  | 1,585 |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 7,077 |  |  | 2,477 |  |  | 4,600 |
Defined benefit pension and post-retirement plans |  | 9,515 |  |  | 3,330 |  |  | 6,185 |
Other comprehensive loss |  | (44,945 | ) |  | (15,732 | ) |  | (29,213 | )
Comprehensive income |  | $ | 187,747 |  |  | 51,099 |  |  | 136,648 |
2014 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 197,131 |  |  | 55,304 |  |  | 141,827 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during the year |  | 72,940 |  |  | 25,529 |  |  | 47,411 |
Amounts reclassified into net income: |  |  |  |  |  |  |
HTM securities |  | (1,299 | ) |  | (455 | ) |  | (844 | )
Non-credit OTTI |  | 1,669 |  |  | 584 |  |  | 1,085 |
Realized gains on AFS securities |  | (28,864 | ) |  | (10,102 | ) |  | (18,762 | )
Net unrealized gains |  | 44,446 |  |  | 15,556 |  |  | 28,890 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | (54,136 | ) |  | (18,947 | ) |  | (35,189 | )
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 1,902 |  |  | 666 |  |  | 1,236 |
Defined benefit pension and post-retirement plans |  | (52,234 | ) |  | (18,281 | ) |  | (33,953 | )
Other comprehensive loss |  | (7,788 | ) |  | (2,725 | ) |  | (5,063 | )
Comprehensive income |  | $ | 189,343 |  |  | 52,579 |  |  | 136,764 |
2013 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 142,267 |  |  | 35,849 |  |  | 106,418 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during the period |  | (83,934 | ) |  | (29,377 | ) |  | (54,557 | )
Non-credit OTTI recognized in OCI |  | 77 |  |  | 27 |  |  | 50 |
Amounts reclassified into net income: |  |  |  |  |  |  |
HTM securities |  | (1,577 | ) |  | (552 | ) |  | (1,025 | )
Non-credit OTTI |  | 14 |  |  | 5 |  |  | 9 |
Realized gains on AFS securities |  | (23,540 | ) |  | (8,239 | ) |  | (15,301 | )
Net unrealized losses |  | (108,960 | ) |  | (38,136 | ) |  | (70,824 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Net actuarial gain |  | 59,654 |  |  | 20,879 |  |  | 38,775 |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 4,374 |  |  | 1,531 |  |  | 2,843 |
Prior service cost |  | 10 |  |  | 4 |  |  | 6 |
Curtailment expense |  | 16 |  |  | 5 |  |  | 11 |
Defined benefit pension and post-retirement plans |  | 64,054 |  |  | 22,419 |  |  | 41,635 |
Other comprehensive loss |  | (44,906 | ) |  | (15,717 | ) |  | (29,189 | )
Comprehensive income |  | $ | 97,361 |  |  | 20,132 |  |  | 77,229 |
Schedule of Components of Accumulated Other Comprehensive Income |
|  | 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, 2013 |  | $ | (1,599 | ) |  | 1,467 |  |  | 51,635 |  |  | 51,503 |  |  | (26,652 | ) |  | 24,851 |
OCI before reclassifications |  | — |  |  | — |  |  | 47,411 |  |  | 47,411 |  |  | (35,189 | ) |  | 12,222 |
Amounts reclassified from AOCI |  | 1,085 |  |  | (844 | ) |  | (18,762 | ) |  | (18,521 | ) |  | 1,236 |  |  | (17,285 | )
Net current period OCI |  | 1,085 |  |  | (844 | ) |  | 28,649 |  |  | 28,890 |  |  | (33,953 | ) |  | (5,063 | )
Balance, December 31, 2014 |  | (514 | ) |  | 623 |  |  | 80,284 |  |  | 80,393 |  |  | (60,605 | ) |  | 19,788 |
OCI before reclassifications |  | — |  |  | — |  |  | (26,143 | ) |  | (26,143 | ) |  | 1,585 |  |  | (24,558 | )
Amounts reclassified from AOCI |  | 232 |  |  | (377 | ) |  | (9,110 | ) |  | (9,255 | ) |  | 4,600 |  |  | (4,655 | )
Net current period OCI |  | 232 |  |  | (377 | ) |  | (35,253 | ) |  | (35,398 | ) |  | 6,185 |  |  | (29,213 | )
Balance, December 31, 2015 |  | $ | (282 | ) |  | 246 |  |  | 45,031 |  |  | 44,995 |  |  | (54,420 | ) |  | (9,425 | )
Schedule of Reclassification out of Accumulated Other Comprehensive Income |
|  |  | Affected Line Item in the Consolidated Statement of Income
($ in thousands) | Year ended December 31, 2015 |  | Year ended December 31, 2014 |
OTTI related |  |  |  |  |
Non-credit OTTI on disposed securities | $ | 357 |  |  | 1,669 |  |  | Net realized gains
| 357 |  |  | 1,669 |  |  | Income from continuing operations, before federal income tax
| (125 | ) |  | (584 | ) |  | Total federal income tax expense
| 232 |  |  | 1,085 |  |  | Net income
HTM related |  |  |  |  |
Unrealized gains and losses on HTM disposals | 308 |  |  | 157 |  |  | Net realized investment gains
Amortization of net unrealized gains on HTM securities | (888 | ) |  | (1,456 | ) |  | Net investment income earned
| (580 | ) |  | (1,299 | ) |  | Income from continuing operations, before federal income tax
| 203 |  |  | 455 |  |  | Total federal income tax expense
| (377 | ) |  | (844 | ) |  | Net income
Realized gains and losses on AFS |  |  |  |  |
Realized gains and losses on AFS disposals | (14,016 | ) |  | (28,864 | ) |  | Net realized investment gains
| (14,016 | ) |  | (28,864 | ) |  | Income from continuing operations, before federal income tax
| 4,906 |  |  | 10,102 |  |  | Total federal income tax expense
| (9,110 | ) |  | (18,762 | ) |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |
Net actuarial loss | 1,538 |  |  | 331 |  |  | Losses and loss expenses incurred
| 5,539 |  |  | 1,571 |  |  | Policy acquisition costs
| 7,077 |  |  | 1,902 |  |  | Income from continuing operations, before federal income tax
Total defined benefit pension and post-retirement life | 7,077 |  |  | 1,902 |  |  | Income from continuing operations, before federal income tax
| (2,477 | ) |  | (666 | ) |  | Total federal income tax expense
| 4,600 |  |  | 1,236 |  |  | Net income
Total reclassifications for the period | $ | (4,655 | ) |  | (17,285 | ) |  | Net income

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