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Comprehensive Income | 12 Months Ended
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Dec. 31, 2015
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 2015, 2014, and 2013 were as follows:
2015 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 232,692 |  |  | 66,831 |  |  | 165,861 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized 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 |
2014 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 197,131 |  |  | 55,304 |  |  | 141,827 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding gains during the year |  | 72,940 |  |  | 25,529 |  |  | 47,411 |
Amounts reclassified into net income: |  |  |  |  |  |  |
HTM securities |  | (1,299 | ) |  | (455 | ) |  | (844 | )
Non-credit OTTI |  | 1,669 |  |  | 584 |  |  | 1,085 |
Realized gains on AFS securities |  | (28,864 | ) |  | (10,102 | ) |  | (18,762 | )
Net unrealized gains |  | 44,446 |  |  | 15,556 |  |  | 28,890 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | (54,136 | ) |  | (18,947 | ) |  | (35,189 | )
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 1,902 |  |  | 666 |  |  | 1,236 |
Defined benefit pension and post-retirement plans |  | (52,234 | ) |  | (18,281 | ) |  | (33,953 | )
Other comprehensive loss |  | (7,788 | ) |  | (2,725 | ) |  | (5,063 | )
Comprehensive income |  | $ | 189,343 |  |  | 52,579 |  |  | 136,764 |
2013 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 142,267 |  |  | 35,849 |  |  | 106,418 |
Components of OCI: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during the period |  | (83,934 | ) |  | (29,377 | ) |  | (54,557 | )
Non-credit OTTI recognized in OCI |  | 77 |  |  | 27 |  |  | 50 |
Amounts reclassified into net income: |  |  |  |  |  |  |
HTM securities |  | (1,577 | ) |  | (552 | ) |  | (1,025 | )
Non-credit OTTI |  | 14 |  |  | 5 |  |  | 9 |
Realized gains on AFS securities |  | (23,540 | ) |  | (8,239 | ) |  | (15,301 | )
Net unrealized losses |  | (108,960 | ) |  | (38,136 | ) |  | (70,824 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Net actuarial gain |  | 59,654 |  |  | 20,879 |  |  | 38,775 |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 4,374 |  |  | 1,531 |  |  | 2,843 |
Prior service cost |  | 10 |  |  | 4 |  |  | 6 |
Curtailment expense |  | 16 |  |  | 5 |  |  | 11 |
Defined benefit pension and post-retirement plans |  | 64,054 |  |  | 22,419 |  |  | 41,635 |
Other comprehensive loss |  | (44,906 | ) |  | (15,717 | ) |  | (29,189 | )
Comprehensive income |  | $ | 97,361 |  |  | 20,132 |  |  | 77,229 |
(b) The balances of, and changes in, each component of AOCI (net of taxes) as of December 31, 2015 and 2014 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, 2013 |  | $ | (1,599 | ) |  | 1,467 |  |  | 51,635 |  |  | 51,503 |  |  | (26,652 | ) |  | 24,851 |
OCI before reclassifications |  | — |  |  | — |  |  | 47,411 |  |  | 47,411 |  |  | (35,189 | ) |  | 12,222 |
Amounts reclassified from AOCI |  | 1,085 |  |  | (844 | ) |  | (18,762 | ) |  | (18,521 | ) |  | 1,236 |  |  | (17,285 | )
Net current period OCI |  | 1,085 |  |  | (844 | ) |  | 28,649 |  |  | 28,890 |  |  | (33,953 | ) |  | (5,063 | )
Balance, December 31, 2014 |  | (514 | ) |  | 623 |  |  | 80,284 |  |  | 80,393 |  |  | (60,605 | ) |  | 19,788 |
OCI before reclassifications |  | — |  |  | — |  |  | (26,143 | ) |  | (26,143 | ) |  | 1,585 |  |  | (24,558 | )
Amounts reclassified from AOCI |  | 232 |  |  | (377 | ) |  | (9,110 | ) |  | (9,255 | ) |  | 4,600 |  |  | (4,655 | )
Net current period OCI |  | 232 |  |  | (377 | ) |  | (35,253 | ) |  | (35,398 | ) |  | 6,185 |  |  | (29,213 | )
Balance, December 31, 2015 |  | $ | (282 | ) |  | 246 |  |  | 45,031 |  |  | 44,995 |  |  | (54,420 | ) |  | (9,425 | )
The reclassifications out of AOCI are as follows:
|  |  | Affected Line Item in the Consolidated Statement of Income
($ in thousands) | Year ended December 31, 2015 |  | Year ended December 31, 2014 |
OTTI related |  |  |  |  |
Non-credit OTTI on disposed securities | $ | 357 |  |  | 1,669 |  |  | Net realized gains
| 357 |  |  | 1,669 |  |  | Income from continuing operations, before federal income tax
| (125 | ) |  | (584 | ) |  | Total federal income tax expense
| 232 |  |  | 1,085 |  |  | Net income
HTM related |  |  |  |  |
Unrealized gains and losses on HTM disposals | 308 |  |  | 157 |  |  | Net realized investment gains
Amortization of net unrealized gains on HTM securities | (888 | ) |  | (1,456 | ) |  | Net investment income earned
| (580 | ) |  | (1,299 | ) |  | Income from continuing operations, before federal income tax
| 203 |  |  | 455 |  |  | Total federal income tax expense
| (377 | ) |  | (844 | ) |  | Net income
Realized gains and losses on AFS |  |  |  |  |
Realized gains and losses on AFS disposals | (14,016 | ) |  | (28,864 | ) |  | Net realized investment gains
| (14,016 | ) |  | (28,864 | ) |  | Income from continuing operations, before federal income tax
| 4,906 |  |  | 10,102 |  |  | Total federal income tax expense
| (9,110 | ) |  | (18,762 | ) |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |
Net actuarial loss | 1,538 |  |  | 331 |  |  | Losses and loss expenses incurred
| 5,539 |  |  | 1,571 |  |  | Policy acquisition costs
| 7,077 |  |  | 1,902 |  |  | Income from continuing operations, before federal income tax
Total defined benefit pension and post-retirement life | 7,077 |  |  | 1,902 |  |  | Income from continuing operations, before federal income tax
| (2,477 | ) |  | (666 | ) |  | Total federal income tax expense
| 4,600 |  |  | 1,236 |  |  | Net income
Total reclassifications for the period | $ | (4,655 | ) |  | (17,285 | ) |  | Net income

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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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d),(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C + Details
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