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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
2017 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 261,968 |  |  | 93,142 |  |  | 168,826 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during the year |  | 66,894 |  |  | 23,879 |  |  | 43,015 |
Non-credit portion of OTTI recognized in OCI |  | 36 |  |  | 13 |  |  | 23 |
Amounts reclassified into net income: |  |  |  |  |  |  |
HTM securities |  | (179 | ) |  | (63 | ) |  | (116 | )
Non-credit OTTI |  | 104 |  |  | 36 |  |  | 68 |
Realized gains on AFS securities |  | (6,979 | ) |  | (2,442 | ) |  | (4,537 | )
Net unrealized gains |  | 59,876 |  |  | 21,423 |  |  | 38,453 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | (4,684 | ) |  | (984 | ) |  | (3,700 | )
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 2,102 |  |  | 735 |  |  | 1,367 |
Defined benefit pension and post-retirement plans |  | (2,582 | ) |  | (249 | ) |  | (2,333 | )
Other comprehensive income |  | 57,294 |  |  | 21,174 |  |  | 36,120 |
Comprehensive income |  | $ | 319,262 |  |  | 114,316 |  |  | 204,946 |
2016 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 219,955 |  |  | 61,460 |  |  | 158,495 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized (losses) gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during the year |  | (9,195 | ) |  | (3,218 | ) |  | (5,977 | )
Non-credit portion of OTTI recognized in OCI |  | (10 | ) |  | (4 | ) |  | (6 | )
Amounts reclassified into net income: |  |  |  |  |  |  |
HTM securities |  | (141 | ) |  | (49 | ) |  | (92 | )
Non-credit OTTI |  | 213 |  |  | 75 |  |  | 138 |
Realized losses on AFS securities |  | 4,713 |  |  | 1,649 |  |  | 3,064 |
Net unrealized losses |  | (4,420 | ) |  | (1,547 | ) |  | (2,873 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | (12,079 | ) |  | (4,227 | ) |  | (7,852 | )
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 6,462 |  |  | 2,262 |  |  | 4,200 |
Defined benefit pension and post-retirement plans |  | (5,617 | ) |  | (1,965 | ) |  | (3,652 | )
Other comprehensive loss |  | (10,037 | ) |  | (3,512 | ) |  | (6,525 | )
Comprehensive income |  | $ | 209,918 |  |  | 57,948 |  |  | 151,970 |
2015 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 232,692 |  |  | 66,831 |  |  | 165,861 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized (losses) 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 |
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, 2015 |  | $ | (282 | ) |  | 194 |  |  | 45,083 |  |  | 44,995 |  |  | (54,420 | ) |  | (9,425 | )
OCI before reclassifications |  | (6 | ) |  | — |  |  | (5,977 | ) |  | (5,983 | ) |  | (7,852 | ) |  | (13,835 | )
Amounts reclassified from AOCI |  | 138 |  |  | (92 | ) |  | 3,064 |  |  | 3,110 |  |  | 4,200 |  |  | 7,310 |
Net current period OCI |  | 132 |  |  | (92 | ) |  | (2,913 | ) |  | (2,873 | ) |  | (3,652 | ) |  | (6,525 | )
Balance, December 31, 2016 |  | (150 | ) |  | 102 |  |  | 42,170 |  |  | 42,122 |  |  | (58,072 | ) |  | (15,950 | )
OCI before reclassifications |  | 23 |  |  | — |  |  | 43,015 |  |  | 43,038 |  |  | (3,700 | ) |  | 39,338 |
Amounts reclassified from AOCI |  | 68 |  |  | (116 | ) |  | (4,537 | ) |  | (4,585 | ) |  | 1,367 |  |  | (3,218 | )
Net current period OCI |  | 91 |  |  | (116 | ) |  | 38,478 |  |  | 38,453 |  |  | (2,333 | ) |  | 36,120 |
Balance, December 31, 2017 |  | $ | (59 | ) |  | (14 | ) |  | 80,648 |  |  | 80,575 |  |  | (60,405 | ) |  | 20,170 |
Schedule of Reclassification out of Accumulated Other Comprehensive Income |
($ in thousands) |  | Year ended December 31, 2017 |  | Year ended December 31, 2016 |  | Affected Line Item in the Consolidated Statements of Income
OTTI related |  |  |  |  |  |
Non-credit OTTI on disposed securities |  | $ | 104 |  |  | 213 |  |  | Net realized gains (losses)
|  | 104 |  |  | 213 |  |  | Income before federal income tax
|  | (36 | ) |  | (75 | ) |  | Total federal income tax expense
|  | 68 |  |  | 138 |  |  | Net income
HTM related |  |  |  |  |  |
Unrealized losses on HTM disposals |  | 32 |  |  | 169 |  |  | Net realized gains (losses)
Amortization of net unrealized gains on HTM securities |  | (211 | ) |  | (310 | ) |  | Net investment income earned
|  | (179 | ) |  | (141 | ) |  | Income before federal income tax
|  | 63 |  |  | 49 |  |  | Total federal income tax expense
|  | (116 | ) |  | (92 | ) |  | Net income
Realized (losses) gains on AFS |  |  |  |  |  |
Realized (losses) gains on AFS disposals |  | (6,979 | ) |  | 4,713 |  |  | Net realized gains (losses)
|  | (6,979 | ) |  | 4,713 |  |  | Income before federal income tax
|  | 2,442 |  |  | (1,649 | ) |  | Total federal income tax expense
|  | (4,537 | ) |  | 3,064 |  |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |
Net actuarial loss |  | 450 |  |  | 1,486 |  |  | Loss and loss expense incurred
|  | 1,652 |  |  | 4,976 |  |  | Other insurance expenses
Total defined benefit pension and post-retirement life |  | 2,102 |  |  | 6,462 |  |  | Income before federal income tax
|  | (735 | ) |  | (2,262 | ) |  | Total federal income tax expense
|  | 1,367 |  |  | 4,200 |  |  | Net income
Total reclassifications for the period |  | $ | (3,218 | ) |  | 7,310 |  |  | Net income

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