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Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
First Quarter 2018 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 19,931 |  |  | 1,006 |  |  | 18,925 |
Other comprehensive loss, net of tax: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during period |  | (85,315 | ) |  | (17,917 | ) |  | (67,398 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (12 | ) |  | (2 | ) |  | (10 | )
Realized losses on disposals of AFS securities |  | 4,549 |  |  | 955 |  |  | 3,594 |
Total unrealized losses on investment securities |  | (80,778 | ) |  | (16,964 | ) |  | (63,814 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 532 |  |  | 112 |  |  | 420 |
Total defined benefit pension and post-retirement plans |  | 532 |  |  | 112 |  |  | 420 |
Other comprehensive loss |  | (80,246 | ) |  | (16,852 | ) |  | (63,394 | )
Comprehensive loss |  | $ | (60,315 | ) |  | (15,846 | ) |  | (44,469 | )
First Quarter 2017 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 67,574 |  |  | 17,134 |  |  | 50,440 |
Other comprehensive income, net of tax: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during period |  | 25,785 |  |  | 9,024 |  |  | 16,761 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (49 | ) |  | (17 | ) |  | (32 | )
Realized losses on disposals of AFS securities |  | 1,510 |  |  | 529 |  |  | 981 |
Total unrealized gains on investment securities |  | 27,246 |  |  | 9,536 |  |  | 17,710 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 507 |  |  | 177 |  |  | 330 |
Total defined benefit pension and post-retirement plans |  | 507 |  |  | 177 |  |  | 330 |
Other comprehensive income |  | 27,753 |  |  | 9,713 |  |  | 18,040 |
Comprehensive income |  | $ | 95,327 |  |  | 26,847 |  |  | 68,480 |
Schedule of Components of Accumulated Other Comprehensive Income Net of Tax |
March 31, 2018 |  |  |  | Defined Benefit Pension and Post-Retirement Plans |  |
|  | Net Unrealized Gains (Losses) on Investment Securities |  |  | Total AOCI
($ in thousands) |  | OTTI Related |  | HTM Related |  | All Other |  | Investments Subtotal |  |
Balance, December 31, 2017 |  | $ | (59 | ) |  | (14 | ) |  | 80,648 |  |  | 80,575 |  |  | (60,405 | ) |  | 20,170 |
Cumulative effect adjustments |  | (12 | ) |  | (2 | ) |  | (12,792 | ) |  | (12,806 | ) |  | (12,213 | ) |  | (25,019 | )
Balance, December 31, 2017 as adjusted |  | (71 | ) |  | (16 | ) |  | 67,856 |  |  | 67,769 |  |  | (72,618 | ) |  | (4,849 | )
OCI before reclassifications |  | — |  |  | — |  |  | (67,398 | ) |  | (67,398 | ) |  | — |  |  | (67,398 | )
Amounts reclassified from AOCI |  | — |  |  | (10 | ) |  | 3,594 |  |  | 3,584 |  |  | 420 |  |  | 4,004 |
Net current period OCI |  | — |  |  | (10 | ) |  | (63,804 | ) |  | (63,814 | ) |  | 420 |  |  | (63,394 | )
Balance, March 31, 2018 |  | $ | (71 | ) |  | (26 | ) |  | 4,052 |  |  | 3,955 |  |  | (72,198 | ) |  | (68,243 | )
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income |
| Quarter ended March 31, | Affected Line Item in the Unaudited Consolidated Statements of Income
($ in thousands) | 2018 |  | 2017
HTM related |  |  |  |
Unrealized losses on HTM disposals | $ | 1 |  |  | 13 |  | Net realized and unrealized losses
Amortization of net unrealized gains on HTM securities | (13 | ) |  | (62 | ) | Net investment income earned
| (12 | ) |  | (49 | ) | Income before federal income tax
| 2 |  |  | 17 |  | Total federal income tax expense
| (10 | ) |  | (32 | ) | Net income
Realized losses on AFS and OTTI |  |  |  |
Realized losses on AFS disposals and OTTI | 4,549 |  |  | 1,510 |  | Net realized and unrealized losses
| 4,549 |  |  | 1,510 |  | Income before federal income tax
| (955 | ) |  | (529 | ) | Total federal income tax expense
| 3,594 |  |  | 981 |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |
Net actuarial loss | 112 |  |  | 110 |  | Loss and loss expense incurred
| 420 |  |  | 397 |  | Other insurance expenses
Total defined benefit pension and post-retirement life | 532 |  |  | 507 |  | Income before federal income tax
| (112 | ) |  | (177 | ) | Total federal income tax expense
| 420 |  |  | 330 |  | Net income
Total reclassifications for the period | $ | 4,004 |  |  | 1,279 |  | Net income

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