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Comprehensive Income | 12 Months Ended
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Dec. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Comprehensive Income | Comprehensive Income (a) The components of comprehensive income, both gross and net of tax, for 2017, 2016, and 2015 were as follows:
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 |
(b) The balances of, and changes in, each component of AOCI (net of taxes) as of December 31, 2017 and 2016 were as follows:
|  | 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 |
The reclassifications out of AOCI are as follows:
($ 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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- References No definition available. + Details
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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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