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Shareholders' Equity and Other Comprehensive Income (Loss) (Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | $ 4,807,768,000 | $ 4,584,438,000 | $ 4,475,801,000 | $ 5,296,800,000 |
Total other comprehensive income (loss), net of tax amount | (284,229,000) | (507,609,000) | (237,287,000) | (1,451,993,000) |
Ending balance | 4,561,568,000 | 4,229,715,000 | 4,561,568,000 | 4,229,715,000 |
Accumulated other comprehensive loss | 1,679,404,000 |  | 1,679,404,000 |  | $ 1,442,117,000
Total |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | (1,395,175,000) | (1,026,705,000) | (1,442,117,000) | (82,321,000) |
Other comprehensive income (loss) before reclassifications | (320,770,000) | (515,420,000) | (335,573,000) | (1,448,523,000) |
Amounts reclassified from AOCI | 36,541,000 | 7,811,000 | 98,286,000 | (3,470,000) |
Total other comprehensive income (loss), net of tax amount | (284,229,000) | (507,609,000) | (237,287,000) | (1,451,993,000) |
Ending balance | (1,679,404,000) | (1,534,314,000) | (1,679,404,000) | (1,534,314,000) |
Net unrealized gains (losses) on investment securities available for sale |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | (1,188,087,000) | (869,519,000) | (1,220,263,000) | (67,980,000) |
Other comprehensive income (loss) before reclassifications | (291,190,000) | (430,453,000) | (258,235,000) | (1,231,992,000) |
Amounts reclassified from AOCI | 0 | 0 | (779,000) | 0 |
Total other comprehensive income (loss), net of tax amount | (291,190,000) | (430,453,000) | (259,014,000) | (1,231,992,000) |
Ending balance | (1,479,277,000) | (1,299,972,000) | (1,479,277,000) | (1,299,972,000) |
Accumulated other comprehensive loss | 13,300,000 |  | 13,300,000 |  |
Net unrealized gains (losses) on cash flow hedges |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] |  |  |  |  |
Beginning balance | (207,088,000) | (157,186,000) | (221,854,000) | (14,341,000) |
Other comprehensive income (loss) before reclassifications | (29,580,000) | (84,967,000) | (77,338,000) | (216,531,000) |
Amounts reclassified from AOCI | 36,541,000 | 7,811,000 | 99,065,000 | (3,470,000) |
Total other comprehensive income (loss), net of tax amount | 6,961,000 | (77,156,000) | 21,727,000 | (220,001,000) |
Ending balance | (200,127,000) | $ (234,342,000) | (200,127,000) | $ (234,342,000) |
Accumulated other comprehensive loss | $ 12,100,000 |  | $ 12,100,000 |  |

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