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Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
Second Quarter 2016 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 62,311 |  |  | 18,710 |  |  | 43,601 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during period |  | 55,675 |  |  | 19,487 |  |  | 36,188 |
Non-credit portion of OTTI recognized in OCI |  | (10 | ) |  | (4 | ) |  | (6 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (19 | ) |  | (7 | ) |  | (12 | )
Realized gains on AFS securities |  | (1,762 | ) |  | (617 | ) |  | (1,145 | )
Total unrealized gains on investment securities |  | 53,884 |  |  | 18,859 |  |  | 35,025 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 1,517 |  |  | 532 |  |  | 985 |
Total defined benefit pension and post-retirement plans |  | 1,517 |  |  | 532 |  |  | 985 |
Other comprehensive income |  | 55,401 |  |  | 19,391 |  |  | 36,010 |
Comprehensive income |  | $ | 117,712 |  |  | 38,101 |  |  | 79,611 |
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 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 |
Total unrealized losses on investment securities |  | (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 |
Total 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 | )
Six Months 2016 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 114,186 |  |  | 33,553 |  |  | 80,633 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during period |  | 121,412 |  |  | 42,495 |  |  | 78,917 |
Non-credit portion of OTTI recognized in OCI |  | (10 | ) |  | (4 | ) |  | (6 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (91 | ) |  | (32 | ) |  | (59 | )
Realized losses on AFS securities |  | 937 |  |  | 328 |  |  | 609 |
Total unrealized gains on investment securities |  | 122,248 |  |  | 42,787 |  |  | 79,461 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 3,033 |  |  | 1,062 |  |  | 1,971 |
Total defined benefit pension and post-retirement plans |  | 3,033 |  |  | 1,062 |  |  | 1,971 |
Other comprehensive income |  | 125,281 |  |  | 43,849 |  |  | 81,432 |
Comprehensive income |  | $ | 239,467 |  |  | 77,402 |  |  | 162,065 |
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 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 | )
Total unrealized losses on investment securities |  | (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 |
Total 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 |
Schedule of Components of Accumulated Other Comprehensive Income |
June 30, 2016 |  |  |  |  |  |
|  | Net Unrealized Gain on Investment Securities |  | Defined Benefit Pension and Post-Retirement Plans |  | Total AOCI
($ in thousands) |  | OTTI Related |  | HTM Related |  | All Other |  | Investments Subtotal |  |
Balance, December 31, 2015 |  | $ | (282 | ) |  | 194 |  |  | 45,083 |  |  | 44,995 |  |  | (54,420 | ) |  | (9,425 | )
OCI before reclassifications |  | (6 | ) |  | — |  |  | 78,917 |  |  | 78,911 |  |  | — |  |  | 78,911 |
Amounts reclassified from AOCI |  | — |  |  | (59 | ) |  | 609 |  |  | 550 |  |  | 1,971 |  |  | 2,521 |
Net current period OCI |  | (6 | ) |  | (59 | ) |  | 79,526 |  |  | 79,461 |  |  | 1,971 |  |  | 81,432 |
Balance, June 30, 2016 |  | $ | (288 | ) |  | 135 |  |  | 124,609 |  |  | 124,456 |  |  | (52,449 | ) |  | 72,007 |
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income |
| Quarter ended June 30, |  | Six Months ended June 30, | Affected Line Item in the Unaudited Consolidated Statement of Income
($ in thousands) | 2016 |  | 2015 |  | 2016 |  | 2015
OTTI related |  |  |  |  |  |  |  |
Non-credit OTTI on disposed securities | $ | — |  |  | — |  |  | — |  |  | 357 |  | Net realized gains (losses)
| — |  |  | — |  |  | — |  |  | 357 |  | Income before federal income tax
| — |  |  | — |  |  | — |  |  | (125 | ) | Total federal income tax expense
| — |  |  | — |  |  | — |  |  | 232 |  | Net income
HTM related |  |  |  |  |  |  |  |
Unrealized losses on HTM disposals | 60 |  |  | 87 |  |  | 88 |  |  | 137 |  | Net realized gains (losses)
Amortization of net unrealized gains on HTM securities | (79 | ) |  | (272 | ) |  | (179 | ) |  | (583 | ) | Net investment income earned
| (19 | ) |  | (185 | ) |  | (91 | ) |  | (446 | ) | Income before federal income tax
| 7 |  |  | 65 |  |  | 32 |  |  | 156 |  | Total federal income tax expense
| (12 | ) |  | (120 | ) |  | (59 | ) |  | (290 | ) | Net income
Realized losses (gains) on AFS and OTTI |  |  |  |  |  |  |  |
Realized losses (gains) on AFS disposals and OTTI | (1,762 | ) |  | 3,422 |  |  | 937 |  |  | (16,473 | ) | Net realized gains (losses)
| (1,762 | ) |  | 3,422 |  |  | 937 |  |  | (16,473 | ) | Income before federal income tax
| 617 |  |  | (1,197 | ) |  | (328 | ) |  | 5,766 |  | Total federal income tax expense
| (1,145 | ) |  | 2,225 |  |  | 609 |  |  | (10,707 | ) | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |  |  |
Net actuarial loss | 329 |  |  | 372 |  |  | 658 |  |  | 743 |  | Loss and loss expense incurred
| 1,188 |  |  | 1,337 |  |  | 2,375 |  |  | 2,675 |  | Policy acquisition costs
Total defined benefit pension and post-retirement life | 1,517 |  |  | 1,709 |  |  | 3,033 |  |  | 3,418 |  | Income before federal income tax
| (532 | ) |  | (598 | ) |  | (1,062 | ) |  | (1,196 | ) | Total federal income tax expense
| 985 |  |  | 1,111 |  |  | 1,971 |  |  | 2,222 |  | Net income
Total reclassifications for the period | $ | (172 | ) |  | 3,216 |  |  | 2,521 |  |  | (8,543 | ) | Net income

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