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Stockholders' Equity and Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2014
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Parent's Common Stock |
($ in thousands) |  |  |  |
Period |  | Shares Purchased in Connection with Restricted Stock Vestings and Stock Option Exercises |  | Cost of Shares Purchased in Connection with Restricted Stock Vestings and Stock Option Exercises
2014 |  | 154,559 |  |  | $ | 3,563 |
2013 |  | 167,846 |  |  | 3,716 |
2012 |  | 194,575 |  |  | 3,495 |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
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 |
2012 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 37,635 |  |  | (328 | ) |  | 37,963 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during the period |  | 47,594 |  |  | 16,657 |  |  | 30,937 |
Non-credit OTTI recognized in OCI |  | 2,554 |  |  | 894 |  |  | 1,660 |
Amounts reclassified into net income: |  |  |  |  |  |  |
HTM securities |  | (2,432 | ) |  | (851 | ) |  | (1,581 | )
Non-credit OTTI |  | 280 |  |  | 98 |  |  | 182 |
Realized gains on AFS securities |  | (9,412 | ) |  | (3,294 | ) |  | (6,118 | )
Net unrealized gains |  | 38,584 |  |  | 13,504 |  |  | 25,080 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | (26,566 | ) |  | (9,298 | ) |  | (17,268 | )
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 5,903 |  |  | 2,066 |  |  | 3,837 |
Prior service cost |  | 150 |  |  | 53 |  |  | 97 |
Defined benefit pension and post-retirement plans |  | (20,513 | ) |  | (7,179 | ) |  | (13,334 | )
Other comprehensive income |  | 18,071 |  |  | 6,325 |  |  | 11,746 |
Comprehensive income |  | $ | 55,706 |  |  | 5,997 |  |  | 49,709 |
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, 2012 |  | $ | (1,658 | ) |  | 2,594 |  |  | 121,391 |  |  | 122,327 |  |  | (68,287 | ) |  | 54,040 |
OCI before reclassifications |  | 50 |  |  | (102 | ) |  | (54,455 | ) |  | (54,507 | ) |  | 38,775 |  |  | (15,732 | )
Amounts reclassified from AOCI |  | 9 |  |  | (1,025 | ) |  | (15,301 | ) |  | (16,317 | ) |  | 2,860 |  |  | (13,457 | )
Net current period OCI |  | 59 |  |  | (1,127 | ) |  | (69,756 | ) |  | (70,824 | ) |  | 41,635 |  |  | (29,189 | )
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 |
Schedule of Reclassification out of Accumulated Other Comprehensive Income |
|  |  | Affected Line Item in the Consolidated Statement of Income
($ in thousands) | Year ended December 31, 2014 |  | Year ended December 31, 2013 |
OTTI related |  |  |  |  |
Amortization of non-credit OTTI losses on HTM securities | $ | — |  |  | 14 |  |  | Net investment income earned
Non-credit OTTI on disposed securities | 1,669 |  |  | — |  |  | Net realized gains
| 1,669 |  |  | 14 |  |  | Income from continuing operations, before federal income tax
| (584 | ) |  | (5 | ) |  | Total federal income tax expense (benefit)
| 1,085 |  |  | 9 |  |  | Net income
HTM related |  |  |  |  |
Unrealized gains and losses on HTM disposals | 157 |  |  | 390 |  |  | Net realized investment gains
Amortization of net unrealized gains on HTM securities | (1,456 | ) |  | (1,967 | ) |  | Net investment income earned
| (1,299 | ) |  | (1,577 | ) |  | Income from continuing operations, before federal income tax
| 455 |  |  | 552 |  |  | Total federal income tax expense (benefit)
| (844 | ) |  | (1,025 | ) |  | Net income
Realized gains and losses on AFS |  |  |  |  |
Realized gains and losses on AFS disposals | (28,864 | ) |  | (23,540 | ) |  | Net realized investment gains
| (28,864 | ) |  | (23,540 | ) |  | Income from continuing operations, before federal income tax
| 10,102 |  |  | 8,239 |  |  | Total federal income tax expense (benefit)
| (18,762 | ) |  | (15,301 | ) |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |
Net actuarial loss | 331 |  |  | 909 |  |  | Losses and loss expenses incurred
| 1,571 |  |  | 3,465 |  |  | Policy acquisition costs
| 1,902 |  |  | 4,374 |  |  | Income from continuing operations, before federal income tax
Prior service cost | — |  |  | 7 |  |  | Losses and loss expenses incurred
| — |  |  | 3 |  |  | Policy acquisition costs
| — |  |  | 10 |  |  | Income from continuing operations, before federal income tax
Curtailment expense | — |  |  | 16 |  |  | Policy acquisition costs
| — |  |  | 16 |  |  | Income from continuing operations, before federal income tax
Total defined benefit pension and post-retirement life | 1,902 |  |  | 4,400 |  |  | Income from continuing operations, before federal income tax
| (666 | ) |  | (1,540 | ) |  | Total federal income tax expense (benefit)
| 1,236 |  |  | 2,860 |  |  | Net income
Total reclassifications for the period | $ | (17,285 | ) |  | (13,457 | ) |  | Net income

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