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Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of Comprehensive Income-Gross and Net of Tax |
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 |
Third Quarter 2018 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 67,130 |  |  | 11,695 |  |  | 55,435 |
Components of other comprehensive loss: |  |  |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |  |  |
Unrealized holding losses during the period |  | (21,565 | ) |  | (4,529 | ) |  | (17,036 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (8 | ) |  | (2 | ) |  | (6 | )
Realized losses on disposals and OTTI of AFS securities |  | 10,839 |  |  | 2,276 |  |  | 8,563 |
Total unrealized losses on investment securities |  | (10,734 | ) |  | (2,255 | ) |  | (8,479 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |  |  |
Net actuarial loss |  | 532 |  |  | 112 |  |  | 420 |
Total defined benefit pension and post-retirement plans |  | 532 |  |  | 112 |  |  | 420 |
Other comprehensive loss |  | (10,202 | ) |  | (2,143 | ) |  | (8,059 | )
Comprehensive income |  | $ | 56,928 |  |  | 9,552 |  |  | 47,376 |
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 |
Nine Months 2018 |  |  |  |  |  |
($ in thousands) |  | Gross |  | Tax |  | Net
Net income |  | $ | 159,586 |  |  | 26,407 |  |  | 133,179 |
Components of other comprehensive loss: |  |  |  |  |  |  |
Unrealized losses on investment securities: |  |  |  |  |  |  |
Unrealized holding losses during the period |  | (130,873 | ) |  | (27,484 | ) |  | (103,389 | )
Amounts reclassified into net income: |  |  |  |  |  |
HTM securities |  | (28 | ) |  | (6 | ) |  | (22 | )
Realized losses on disposals and OTTI of AFS securities |  | 18,258 |  |  | 3,834 |  |  | 14,424 |
Total unrealized losses on investment securities |  | (112,643 | ) |  | (23,656 | ) |  | (88,987 | )
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |
Amounts reclassified into net income: |  |  |  |  |  |  |
Net actuarial loss |  | 1,595 |  |  | 335 |  |  | 1,260 |
Total defined benefit pension and post-retirement plans |  | 1,595 |  |  | 335 |  |  | 1,260 |
Other comprehensive loss |  | (111,048 | ) |  | (23,321 | ) |  | (87,727 | )
Comprehensive income |  | $ | 48,538 |  |  | 3,086 |  |  | 45,452 |
Schedule of Components of Accumulated Other Comprehensive Income Net of Tax |
September 30, 2019 |  |  |  | Defined Benefit Pension and Post-Retirement Plans |  |
|  | Net Unrealized Gains (Losses) on Investment Securities |  |  | Total AOCI
($ in thousands) |  | OTTI Related |  | HTM Related |  | All Other |  | Investments Subtotal |  |
Balance, December 31, 2018 |  | $ | (71 | ) |  | 71 |  |  | 1,888 |  |  | 1,888 |  |  | (79,844 | ) |  | (77,956 | )
OCI before reclassifications |  | — |  |  | — |  |  | 174,483 |  |  | 174,483 |  |  | — |  |  | 174,483 |
Amounts reclassified from AOCI |  | — |  |  | (26 | ) |  | 351 |  |  | 325 |  |  | 1,574 |  |  | 1,899 |
Net current period OCI |  | — |  |  | (26 | ) |  | 174,834 |  |  | 174,808 |  |  | 1,574 |  |  | 176,382 |
Balance, September 30, 2019 |  | $ | (71 | ) |  | 45 |  |  | 176,722 |  |  | 176,696 |  |  | (78,270 | ) |  | 98,426 |
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) | 2019 |  | 2018 |  | 2019 |  | 2018
HTM related |  |  |  |  |  |  |  |
Unrealized (gains) losses on HTM disposals | $ | (3 | ) |  | 11 |  |  | (12 | ) |  | 5 |  | Net realized and unrealized (losses) gains
Amortization of net unrealized gains on HTM securities | — |  |  | (19 | ) |  | (21 | ) |  | (33 | ) | Net investment income earned
| (3 | ) |  | (8 | ) |  | (33 | ) |  | (28 | ) | Income before federal income tax
| 1 |  |  | 2 |  |  | 7 |  |  | 6 |  | Total federal income tax expense
| (2 | ) |  | (6 | ) |  | (26 | ) |  | (22 | ) | Net income
Realized losses on AFS and OTTI |  |  |  |  |  |  |  |
Realized losses on AFS disposals and OTTI | 2,821 |  |  | 10,839 |  |  | 444 |  |  | 18,258 |  | Net realized and unrealized (losses) gains
| 2,821 |  |  | 10,839 |  |  | 444 |  |  | 18,258 |  | Income before federal income tax
| (592 | ) |  | (2,276 | ) |  | (93 | ) |  | (3,834 | ) | Total federal income tax expense
| 2,229 |  |  | 8,563 |  |  | 351 |  |  | 14,424 |  | Net income
Defined benefit pension and post-retirement life plans |  |  |  |  |  |  |  |
Net actuarial loss | 146 |  |  | 112 |  |  | 436 |  |  | 337 |  | Loss and loss expense incurred
| 519 |  |  | 420 |  |  | 1,557 |  |  | 1,258 |  | Other insurance expenses
Total defined benefit pension and post-retirement life | 665 |  |  | 532 |  |  | 1,993 |  |  | 1,595 |  | Income before federal income tax
| (140 | ) |  | (112 | ) |  | (419 | ) |  | (335 | ) | Total federal income tax expense
| 525 |  |  | 420 |  |  | 1,574 |  |  | 1,260 |  | Net income
Total reclassifications for the period | $ | 2,752 |  |  | 8,977 |  |  | 1,899 |  |  | 15,662 |  | Net income

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