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Comprehensive Income (Tables) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
Third Quarter 2020 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 85,257 |  |  | 15,382 |  |  | 69,875 |
Components of OCI: |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |
Unrealized holding gains during the period |  | 37,836 |  |  | 7,947 |  |  | 29,889 |
Non-credit portion of OTTI recognized in OCI |  | 9,239 |  |  | 1,940 |  |  | 7,299 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (1) |  |  | (1) |  |  | — |
Realized gains on disposals and intent-to-sell OTTI on AFS securities |  | (515) |  |  | (109) |  |  | (406) |
Credit loss benefit recognized in OTTI |  | (2,853) |  |  | (599) |  |  | (2,254) |
Total unrealized gains on investment securities |  | 43,706 |  |  | 9,178 |  |  | 34,528 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 754 |  |  | 158 |  |  | 596 |
Total defined benefit pension and post-retirement plans |  | 754 |  |  | 158 |  |  | 596 |
Other comprehensive income |  | 44,460 |  |  | 9,336 |  |  | 35,124 |
Comprehensive income |  | $ | 129,717 |  |  | 24,718 |  |  | 104,999 |
Third Quarter 2019 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 71,178 |  |  | 15,028 |  |  | 56,150 |
Components of OCI: |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |
Unrealized holding gains during the period |  | 34,392 |  |  | 7,224 |  |  | 27,168 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (3) |  |  | (1) |  |  | (2) |
Realized losses on disposals and OTTI of AFS securities |  | 2,821 |  |  | 592 |  |  | 2,229 |
Total unrealized gains on investment securities |  | 37,210 |  |  | 7,815 |  |  | 29,395 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 665 |  |  | 140 |  |  | 525 |
Total defined benefit pension and post-retirement plans |  | 665 |  |  | 140 |  |  | 525 |
Other comprehensive income |  | 37,875 |  |  | 7,955 |  |  | 29,920 |
Comprehensive income |  | $ | 109,053 |  |  | 22,983 |  |  | 86,070 |
Nine Months 2020 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 143,947 |  |  | 24,653 |  |  | 119,294 |
Components of OCI: |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |
Unrealized holding gains during the period |  | 132,623 |  |  | 27,852 |  |  | 104,771 |
Non-credit portion of OTTI recognized in OCI |  | (18,672) |  |  | (3,921) |  |  | (14,751) |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (7) |  |  | (2) |  |  | (5) |
Realized losses on disposals and intent-to-sell OTTI on AFS securities |  | 9,126 |  |  | 1,916 |  |  | 7,210 |
Credit loss expense recognized in OTTI |  | 8,010 |  |  | 1,682 |  |  | 6,328 |
Total unrealized gains on investment securities |  | 131,080 |  |  | 27,527 |  |  | 103,553 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 2,261 |  |  | 474 |  |  | 1,787 |
Total defined benefit pension and post-retirement plans |  | 2,261 |  |  | 474 |  |  | 1,787 |
Other comprehensive income |  | 133,341 |  |  | 28,001 |  |  | 105,340 |
Comprehensive income |  | $ | 277,288 |  |  | 52,654 |  |  | 224,634 |
Nine Months 2019 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 235,097 |  |  | 45,333 |  |  | 189,764 |
Components of OCI: |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |
Unrealized holding gains during the period |  | 220,864 |  |  | 46,381 |  |  | 174,483 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (33) |  |  | (7) |  |  | (26) |
Realized losses on disposals and OTTI of AFS securities |  | 444 |  |  | 93 |  |  | 351 |
Total unrealized gains on investment securities |  | 221,275 |  |  | 46,467 |  |  | 174,808 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 1,993 |  |  | 419 |  |  | 1,574 |
Total defined benefit pension and post-retirement plans |  | 1,993 |  |  | 419 |  |  | 1,574 |
Other comprehensive income |  | 223,268 |  |  | 46,886 |  |  | 176,382 |
Comprehensive income |  | $ | 458,365 |  |  | 92,219 |  |  | 366,146 |
Third Quarter 2020 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 85,257 |  |  | 15,382 |  |  | 69,875 |
Components of OCI: |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |
Unrealized holding gains during the period |  | 37,836 |  |  | 7,947 |  |  | 29,889 |
Non-credit portion of OTTI recognized in OCI |  | 9,239 |  |  | 1,940 |  |  | 7,299 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (1) |  |  | (1) |  |  | — |
Realized gains on disposals and intent-to-sell OTTI on AFS securities |  | (515) |  |  | (109) |  |  | (406) |
Credit loss benefit recognized in OTTI |  | (2,853) |  |  | (599) |  |  | (2,254) |
Total unrealized gains on investment securities |  | 43,706 |  |  | 9,178 |  |  | 34,528 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 754 |  |  | 158 |  |  | 596 |
Total defined benefit pension and post-retirement plans |  | 754 |  |  | 158 |  |  | 596 |
Other comprehensive income |  | 44,460 |  |  | 9,336 |  |  | 35,124 |
Comprehensive income |  | $ | 129,717 |  |  | 24,718 |  |  | 104,999 |
Third Quarter 2019 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 71,178 |  |  | 15,028 |  |  | 56,150 |
Components of OCI: |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |
Unrealized holding gains during the period |  | 34,392 |  |  | 7,224 |  |  | 27,168 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (3) |  |  | (1) |  |  | (2) |
Realized losses on disposals and OTTI of AFS securities |  | 2,821 |  |  | 592 |  |  | 2,229 |
Total unrealized gains on investment securities |  | 37,210 |  |  | 7,815 |  |  | 29,395 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 665 |  |  | 140 |  |  | 525 |
Total defined benefit pension and post-retirement plans |  | 665 |  |  | 140 |  |  | 525 |
Other comprehensive income |  | 37,875 |  |  | 7,955 |  |  | 29,920 |
Comprehensive income |  | $ | 109,053 |  |  | 22,983 |  |  | 86,070 |
Nine Months 2020 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 143,947 |  |  | 24,653 |  |  | 119,294 |
Components of OCI: |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |
Unrealized holding gains during the period |  | 132,623 |  |  | 27,852 |  |  | 104,771 |
Non-credit portion of OTTI recognized in OCI |  | (18,672) |  |  | (3,921) |  |  | (14,751) |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (7) |  |  | (2) |  |  | (5) |
Realized losses on disposals and intent-to-sell OTTI on AFS securities |  | 9,126 |  |  | 1,916 |  |  | 7,210 |
Credit loss expense recognized in OTTI |  | 8,010 |  |  | 1,682 |  |  | 6,328 |
Total unrealized gains on investment securities |  | 131,080 |  |  | 27,527 |  |  | 103,553 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 2,261 |  |  | 474 |  |  | 1,787 |
Total defined benefit pension and post-retirement plans |  | 2,261 |  |  | 474 |  |  | 1,787 |
Other comprehensive income |  | 133,341 |  |  | 28,001 |  |  | 105,340 |
Comprehensive income |  | $ | 277,288 |  |  | 52,654 |  |  | 224,634 |
Nine Months 2019 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 235,097 |  |  | 45,333 |  |  | 189,764 |
Components of OCI: |  |  |  |  |  |
Unrealized gains on investment securities: |  |  |  |  |  |
Unrealized holding gains during the period |  | 220,864 |  |  | 46,381 |  |  | 174,483 |
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (33) |  |  | (7) |  |  | (26) |
Realized losses on disposals and OTTI of AFS securities |  | 444 |  |  | 93 |  |  | 351 |
Total unrealized gains on investment securities |  | 221,275 |  |  | 46,467 |  |  | 174,808 |
Defined benefit pension and post-retirement plans: |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |
Net actuarial loss |  | 1,993 |  |  | 419 |  |  | 1,574 |
Total defined benefit pension and post-retirement plans |  | 1,993 |  |  | 419 |  |  | 1,574 |
Other comprehensive income |  | 223,268 |  |  | 46,886 |  |  | 176,382 |
Comprehensive income |  | $ | 458,365 |  |  | 92,219 |  |  | 366,146 |
Schedule of Components of Accumulated Other Comprehensive Income Net of Tax |  |
September 30, 2020 |  |  |  | Defined Benefit Pension and Post-Retirement Plans |  |
|  | Net Unrealized Gains (Losses) on Investment Securities |  |  | Total AOCI
($ in thousands) |  | OTTI Related 1 |  | HTM Related |  | All Other |  | Investments Subtotal |  |
Balance, December 31, 2019 |  | $ | (71) |  |  | 25 |  |  | 170,439 |  |  | 170,393 |  |  | (88,643) |  |  | 81,750 |
OCI before reclassifications |  | (14,751) |  |  | — |  |  | 104,771 |  |  | 90,020 |  |  | — |  |  | 90,020 |
Amounts reclassified from AOCI |  | 6,328 |  |  | (5) |  |  | 7,210 |  |  | 13,533 |  |  | 1,787 |  |  | 15,320 |
Net current period OCI |  | (8,423) |  |  | (5) |  |  | 111,981 |  |  | 103,553 |  |  | 1,787 |  |  | 105,340 |
Balance, September 30, 2020 |  | $ | (8,494) |  |  | 20 |  |  | 282,420 |  |  | 273,946 |  |  | (86,856) |  |  | 187,090 |
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income |  |
| Quarter ended September 30, |  | Nine Months ended September 30, | Affected Line Item in the Unaudited Consolidated Statements of Income
($ in thousands) | 2020 |  | 2019 |  | 2020 |  | 2019
HTM related |  |  |  |  |  |  |  |
Unrealized losses (gains) on HTM disposals | $ | 4 |  |  | (3) |  |  | 5 |  |  | (12) |  | Net realized and unrealized gains (losses)
Amortization of net unrealized gains on HTM securities | (5) |  |  | — |  |  | (12) |  |  | (21) |  | Net investment income earned
| (1) |  |  | (3) |  |  | (7) |  |  | (33) |  | Income before federal income tax
| 1 |  |  | 1 |  |  | 2 |  |  | 7 |  | Total federal income tax expense
| — |  |  | (2) |  |  | (5) |  |  | (26) |  | Net income
Net realized (gains) losses on disposals and intent-to-sell OTTI |  |  |  |  |  |  |  |
Net realized (gains) losses on disposals and intent-to-sell OTTI | (515) |  |  | 2,821 |  |  | 9,126 |  |  | 444 |  | Net realized and unrealized gains (losses)
| (515) |  |  | 2,821 |  |  | 9,126 |  |  | 444 |  | Income before federal income tax
| 109 |  |  | (592) |  |  | (1,916) |  |  | (93) |  | Total federal income tax expense
| (406) |  |  | 2,229 |  |  | 7,210 |  |  | 351 |  | Net income
OTTI related |  |  |  |  |  |  |  |
Credit loss (benefit) expense recognized in OTTI | (2,853) |  |  | — |  |  | 8,010 |  |  | — |  | Net realized and unrealized gains (losses)
| (2,853) |  |  | — |  |  | 8,010 |  |  | — |  | Income before federal income tax
| 599 |  |  | — |  |  | (1,682) |  |  | — |  | Total federal income tax expense
| (2,254) |  |  | — |  |  | 6,328 |  |  | — |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |  |  |
Net actuarial loss | 162 |  |  | 146 |  |  | 486 |  |  | 436 |  | Loss and loss expense incurred
| 592 |  |  | 519 |  |  | 1,775 |  |  | 1,557 |  | Other insurance expenses
Total defined benefit pension and post-retirement life | 754 |  |  | 665 |  |  | 2,261 |  |  | 1,993 |  | Income before federal income tax
| (158) |  |  | (140) |  |  | (474) |  |  | (419) |  | Total federal income tax expense
| 596 |  |  | 525 |  |  | 1,787 |  |  | 1,574 |  | Net income
Total reclassifications for the period | $ | (2,064) |  |  | 2,752 |  |  | 15,320 |  |  | 1,899 |  | Net income

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