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Shareholders' Equity and Other Comprehensive Income (Loss) - OCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance |  |  | $ 5,119,993 |  |
Other comprehensive income (loss) before reclassifications | $ (40,216) | $ (138,191) | (201,543) | $ (14,804) |
Amounts reclassified from AOCI | 238,036 | 32,343 | 268,242 | 61,746 |
Other comprehensive income (loss), net of income taxes | 197,820 | (105,848) | 66,699 | 46,942 |
Ending balance | 5,053,606 |  | 5,053,606 |  |
Accumulated other comprehensive income (loss), net | (1,050,374) |  | (1,050,374) |  | $ (1,117,073)
Total |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | (1,248,194) | (1,289,327) | (1,117,073) | (1,442,117) |
Other comprehensive income (loss), net of income taxes | 197,820 | (105,848) | 66,699 | 46,942 |
Ending balance | (1,050,374) | (1,395,175) | (1,050,374) | (1,395,175) |
Net unamortized holding (losses) gains on AFS investment securities transferred to HTM |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | 0 | 0 | 0 | 0 |
Other comprehensive income (loss) before reclassifications | (537,434) | 0 | (537,434) | 0 |
Amounts reclassified from AOCI | 15,654 | 0 | 15,654 | 0 |
Other comprehensive income (loss), net of income taxes | (521,780) | 0 | (521,780) | 0 |
Ending balance | (521,780) | 0 | (521,780) | 0 |
Net unrealized gains (losses) on investment securities AFS |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | (1,116,309) | (1,105,221) | (998,259) | (1,220,263) |
Other comprehensive income (loss) before reclassifications | 511,079 | (82,866) | 393,029 | 32,955 |
Amounts reclassified from AOCI | 194,677 | 0 | 194,677 | (779) |
Other comprehensive income (loss), net of income taxes | 705,756 | (82,866) | 587,706 | 32,176 |
Ending balance | (410,553) | (1,188,087) | (410,553) | (1,188,087) |
Accumulated other comprehensive income (loss), net | (10,200) | (13,300) | (10,200) | (13,300) |
Net unrealized gains (losses) on cash flow hedges |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | (131,885) | (184,106) | (118,814) | (221,854) |
Other comprehensive income (loss) before reclassifications | (13,861) | (55,325) | (57,138) | (47,759) |
Amounts reclassified from AOCI | 27,705 | 32,343 | 57,911 | 62,525 |
Other comprehensive income (loss), net of income taxes | 13,844 | (22,982) | 773 | 14,766 |
Ending balance | (118,041) | (207,088) | (118,041) | (207,088) |
Accumulated other comprehensive income (loss), net | $ (11,600) | $ (12,100) | $ (11,600) | $ (12,100) |

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