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Comprehensive Income | 12 Months Ended
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Dec. 31, 2021
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 2021, 2020, and 2019 were as follows:
2021 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 505,310 |  |  | 101,473 |  |  | 403,837 |
Components of OCI: |  |  |  |  |  |
Unrealized (losses) gains on investment securities: |  |  |  |  |  |
Unrealized holding losses during the year |  | (151,391) |  |  | (31,793) |  |  | (119,598) |
Unrealized losses on securities with credit loss recognized in earnings |  | (9,061) |  |  | (1,902) |  |  | (7,159) |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (11) |  |  | (2) |  |  | (9) |
Net realized gains on disposals and losses on intent-to-sell AFS securities |  | (3,825) |  |  | (803) |  |  | (3,022) |
Credit loss expense |  | 6,858 |  |  | 1,440 |  |  | 5,418 |
Total unrealized losses on investment securities |  | (157,430) |  |  | (33,060) |  |  | (124,370) |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Net actuarial gain |  | 21,636 |  |  | 4,543 |  |  | 17,093 |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 2,772 |  |  | 582 |  |  | 2,190 |
Total defined benefit pension and post-retirement plans |  | 24,408 |  |  | 5,125 |  |  | 19,283 |
Other comprehensive loss |  | (133,022) |  |  | (27,935) |  |  | (105,087) |
Comprehensive income |  | $ | 372,288 |  |  | 73,538 |  |  | 298,750 |
2020 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 302,988 |  |  | 56,633 |  |  | 246,355 |
Components of OCI: |  |  |  |  |  |
Unrealized gains (losses) on investment securities: |  |  |  |  |  |
Unrealized holding gains during the year |  | 168,487 |  |  | 35,383 |  |  | 133,104 |
Unrealized losses on securities with credit loss recognized in earnings |  | (8,176) |  |  | (1,717) |  |  | (6,459) |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (24) |  |  | (5) |  |  | (19) |
Net realized losses on disposals and losses on intent-to-sell AFS securities |  | 5,376 |  |  | 1,129 |  |  | 4,247 |
Credit loss expense |  | 5,042 |  |  | 1,058 |  |  | 3,984 |
Total unrealized gains on investment securities |  | 170,705 |  |  | 35,848 |  |  | 134,857 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Net actuarial gain |  | 1,515 |  |  | 318 |  |  | 1,197 |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 3,015 |  |  | 633 |  |  | 2,382 |
Total defined benefit pension and post-retirement plans |  | 4,530 |  |  | 951 |  |  | 3,579 |
Other comprehensive income |  | 175,235 |  |  | 36,799 |  |  | 138,436 |
Comprehensive income |  | $ | 478,223 |  |  | 93,432 |  |  | 384,791 |
2019 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 336,390 |  |  | 64,767 |  |  | 271,623 |
Components of OCI: |  |  |  |  |  |
Unrealized gains (losses) on investment securities: |  |  |  |  |  |
Unrealized holding gains during the year |  | 212,683 |  |  | 44,662 |  |  | 168,021 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (58) |  |  | (12) |  |  | (46) |
Realized losses on disposals and OTTI of AFS securities |  | 671 |  |  | 141 |  |  | 530 |
Total unrealized gains on investment securities |  | 213,296 |  |  | 44,791 |  |  | 168,505 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Net actuarial loss |  | (13,795) |  |  | (2,897) |  |  | (10,898) |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 2,657 |  |  | 558 |  |  | 2,099 |
Total defined benefit pension and post-retirement plans |  | (11,138) |  |  | (2,339) |  |  | (8,799) |
Other comprehensive income |  | 202,158 |  |  | 42,452 |  |  | 159,706 |
Comprehensive income |  | $ | 538,548 |  |  | 107,219 |  |  | 431,329 |
(b) The balances of, and changes in, each component of AOCI (net of taxes) as of December 31, 2021 and 2020 were as follows:
|  |  |  | Net Unrealized Gains (Losses) on Investment Securities |  | Defined Benefit Pension and Post-retirement Plans |  |
($ in thousands) |  |  |  | Credit Loss Related 1 |  | HTM Related |  | All Other |  | Investments Subtotal |  |  | Total AOCI
Balance, December 31, 2019 |  |  |  | $ | (71) |  |  | 25 |  |  | 170,439 |  |  | 170,393 |  |  | (88,643) |  |  | 81,750 |
OCI before reclassifications |  |  |  | (6,459) |  |  | — |  |  | 133,104 |  |  | 126,645 |  |  | 1,197 |  |  | 127,842 |
Amounts reclassified from AOCI |  |  |  | 3,984 |  |  | (19) |  |  | 4,247 |  |  | 8,212 |  |  | 2,382 |  |  | 10,594 |
Net current period OCI |  |  |  | (2,475) |  |  | (19) |  |  | 137,351 |  |  | 134,857 |  |  | 3,579 |  |  | 138,436 |
Balance, December 31, 2020 |  |  |  | (2,546) |  |  | 6 |  |  | 307,790 |  |  | 305,250 |  |  | (85,064) |  |  | 220,186 |
OCI before reclassifications |  |  |  | (7,159) |  |  | — |  |  | (119,598) |  |  | (126,757) |  |  | 17,093 |  |  | (109,664) |
Amounts reclassified from AOCI |  |  |  | 5,418 |  |  | (9) |  |  | (3,022) |  |  | 2,387 |  |  | 2,190 |  |  | 4,577 |
Net current period OCI |  |  |  | (1,741) |  |  | (9) |  |  | (122,620) |  |  | (124,370) |  |  | 19,283 |  |  | (105,087) |
Balance, December 31, 2021 |  |  |  | $ | (4,287) |  |  | (3) |  |  | 185,170 |  |  | 180,880 |  |  | (65,781) |  |  | 115,099 |
1 Represents change in unrealized loss on securities with credit loss recognized in earnings. The reclassifications out of AOCI are as follows:
($ in thousands) |  | Year ended December 31, 2021 |  | Year ended December 31, 2020 |  | Affected Line Item in the Consolidated Statements of Income
HTM related |  |  |  |  |  |
Unrealized gains on HTM disposals |  | $ | (14) |  |  | (16) |  |  | Net realized and unrealized investment gains (losses)
Amortization of net unrealized gains on HTM securities |  | 3 |  |  | (8) |  |  | Net investment income earned
|  | (11) |  |  | (24) |  |  | Income before federal income tax
|  | 2 |  |  | 5 |  |  | Total federal income tax expense
|  | (9) |  |  | (19) |  |  | Net income
Net realized (gains) losses on disposals and losses on intent-to-sell AFS securities |  |  |  |  |  |
Net realized (gains) losses on disposals and losses on intent-to-sell AFS securities |  | (3,825) |  |  | 5,376 |  |  | Net realized and unrealized investment gains (losses)
|  | (3,825) |  |  | 5,376 |  |  | Income before federal income tax
|  | 803 |  |  | (1,129) |  |  | Total federal income tax expense
|  | (3,022) |  |  | 4,247 |  |  | Net income
Credit loss related |  |  |  |  |  |
Credit loss expense |  | 6,858 |  |  | 5,042 |  |  | Net realized and unrealized investment gains (losses)
|  | 6,858 |  |  | 5,042 |  |  | Income before federal income tax
|  | (1,440) |  |  | (1,058) |  |  | Total federal income tax expense
|  | 5,418 |  |  | 3,984 |  |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |
Net actuarial loss |  | 638 |  |  | 647 |  |  | Loss and loss expense incurred
|  | 2,134 |  |  | 2,368 |  |  | Other insurance expenses
Total defined benefit pension and post-retirement life |  | 2,772 |  |  | 3,015 |  |  | Income before federal income tax
|  | (582) |  |  | (633) |  |  | Total federal income tax expense
|  | 2,190 |  |  | 2,382 |  |  | Net income
Total reclassifications for the period |  | $ | 4,577 |  |  | 10,594 |  |  | 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -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=120397183&loc=d3e187085-122770 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 16 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496180-112644 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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