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Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
First Quarter 2015 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 56,290 |  |  | 16,582 |  |  | 39,708 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during the period |  | 23,977 |  |  | 8,391 |  |  | 15,586 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (261 | ) |  | (91 | ) |  | (170 | )
Non-credit OTTI |  | 357 |  |  | 125 |  |  | 232 |
Realized gains on AFS securities |  | (19,895 | ) |  | (6,963 | ) |  | (12,932 | )
Net unrealized gains |  | 4,178 |  |  | 1,462 |  |  | 2,716 |
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 income |  | 5,887 |  |  | 2,060 |  |  | 3,827 |
Comprehensive income |  | $ | 62,177 |  |  | 18,642 |  |  | 43,535 |
First Quarter 2014 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 25,084 |  |  | 7,110 |  |  | 17,974 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during the period |  | 32,964 |  |  | 11,538 |  |  | 21,426 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (456 | ) |  | (160 | ) |  | (296 | )
Realized gains on AFS securities |  | (7,229 | ) |  | (2,530 | ) |  | (4,699 | )
Net unrealized gains |  | 25,279 |  |  | 8,848 |  |  | 16,431 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 380 |  |  | 133 |  |  | 247 |
Defined benefit pension and post-retirement plans |  | 380 |  |  | 133 |  |  | 247 |
Other comprehensive income |  | 25,659 |  |  | 8,981 |  |  | 16,678 |
Comprehensive income |  | $ | 50,743 |  |  | 16,091 |  |  | 34,652 |
Schedule of Components of Accumulated Other Comprehensive Income |
March 31, 2015 |  |  |  |  |  |
|  | Net Unrealized (Loss) Gain on Investment Securities |  | Defined Benefit Pension and Post-Retirement Plans |  |
($ in thousands) |  | OTTI Related |  | HTM Related |  | All Other |  | Investments Subtotal |  |  | Total AOCI
Balance, December 31, 2014 |  | $ | (514 | ) |  | 623 |  |  | 80,284 |  |  | 80,393 |  |  | (60,605 | ) |  | 19,788 |
OCI before reclassifications |  | — |  |  | — |  |  | 15,586 |  |  | 15,586 |  |  | — |  |  | 15,586 |
Amounts reclassified from AOCI |  | 232 |  |  | (170 | ) |  | (12,932 | ) |  | (12,870 | ) |  | 1,111 |  |  | (11,759 | )
Net current period OCI |  | 232 |  |  | (170 | ) |  | 2,654 |  |  | 2,716 |  |  | 1,111 |  |  | 3,827 |
Balance, March 31, 2015 |  | $ | (282 | ) |  | 453 |  |  | 82,938 |  |  | 83,109 |  |  | (59,494 | ) |  | 23,615 |
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income |
| Quarter ended March 31, |  |
($ in thousands) | 2015 |  | 2014 |  | Affected Line Item in the Unaudited Consolidated Statement of Income
OTTI related |  |  |  |  |
Non-credit OTTI on disposed securities | 357 |  |  | — |  |  | Net realized gains
| 357 |  |  | — |  |  | Income before federal income tax
| (125 | ) |  | — |  |  | Total federal income tax expense
| 232 |  |  | — |  |  | Net income
HTM related |  |  |  |  |
Unrealized losses on HTM disposals | 50 |  |  | 24 |  |  | Net realized gains
Amortization of net unrealized gains on HTM securities | (311 | ) |  | (480 | ) |  | Net investment income earned
| (261 | ) |  | (456 | ) |  | Income before federal income tax
| 91 |  |  | 160 |  |  | Total federal income tax expense
| (170 | ) |  | (296 | ) |  | Net income
Realized gains and losses on AFS and OTTI |  |  |  |  |
Realized gains on AFS disposals and OTTI | (19,895 | ) |  | (7,229 | ) |  | Net realized gains
| (19,895 | ) |  | (7,229 | ) |  | Income before federal income tax
| 6,963 |  |  | 2,530 |  |  | Total federal income tax expense
| (12,932 | ) |  | (4,699 | ) |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |
Net actuarial loss | 371 |  |  | 87 |  |  | Loss and loss expense incurred
| 1,338 |  |  | 293 |  |  | Policy acquisition costs
Total defined benefit pension and post-retirement life | 1,709 |  |  | 380 |  |  | Income before federal income tax
| (598 | ) |  | (133 | ) |  | Total federal income tax expense
| 1,111 |  |  | 247 |  |  | Net income
Total reclassifications for the period | (11,759 | ) |  | (4,748 | ) |  | Net income

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e526-108580 + Details
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