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Segment Reporting (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Segment Income Statement Data Abstract |  |  |  |  |  |  |  |  |
Interest Income (Expense), Operating | $ 262,509 |  |  | $ 254,244 |  |  | $ 776,960 | $ 786,171 |
Net intersegment interest income (expense) | 0 |  |  | 0 |  |  | 0 | 0 |
Segment net interest income | 262,509 |  |  | 254,244 |  |  | 776,960 | 786,171 |
Noninterest Income | 67,221 |  |  | 66,579 |  |  | 197,365 | 194,195 |
Revenues, Total | 329,730 |  |  | 320,823 |  |  | 974,325 | 980,366 |
Provision for Loan, Lease, and Other Losses | 20,991 |  |  | 21,943 |  |  | 68,000 | 62,014 |
Noninterest Expense | 200,597 |  |  | 196,205 |  |  | 594,115 | 574,291 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total | 108,142 |  |  | 102,674 |  |  | 312,211 | 344,061 |
Income Tax Expense (Benefit) | 20,124 |  |  | 19,426 |  |  | 27,451 | 70,299 |
Net Income (Loss) Attributable to Parent, Total | 88,018 | $ 115,573 | $ 81,169 | 83,248 | $ 87,154 | $ 103,360 | 284,760 | 273,762 |
Goodwill | 1,104,992 |  |  | 1,104,992 |  |  | 1,104,992 | 1,104,992 | $ 1,104,992
Operating Segments | Corporate and Commercial Specialty [Member] |  |  |  |  |  |  |  |  |
Segment Income Statement Data Abstract |  |  |  |  |  |  |  |  |
Interest Income (Expense), Operating | 254,935 |  |  | 250,365 |  |  | 749,062 | 710,031 |
Net intersegment interest income (expense) | (98,898) |  |  | (106,675) |  |  | (291,872) | (288,366) |
Segment net interest income | 156,037 |  |  | 143,690 |  |  | 457,190 | 421,665 |
Noninterest Income | 37,017 |  |  | 34,086 |  |  | 106,570 | 99,254 |
Revenues, Total | 193,054 |  |  | 177,776 |  |  | 563,761 | 520,919 |
Provision for Loan, Lease, and Other Losses | 17,009 |  |  | 14,066 |  |  | 48,930 | 41,523 |
Noninterest Expense | 65,415 |  |  | 63,265 |  |  | 197,159 | 186,521 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total | 110,630 |  |  | 100,445 |  |  | 317,672 | 292,876 |
Income Tax Expense (Benefit) | 20,999 |  |  | 19,293 |  |  | 59,845 | 54,104 |
Net Income (Loss) Attributable to Parent, Total | 89,630 |  |  | 81,152 |  |  | 257,827 | 238,772 |
Goodwill | 525,836 |  |  | 525,836 |  |  | 525,836 | 525,836 |
Operating Segments | Community, Consumer, and Business [Member] |  |  |  |  |  |  |  |  |
Segment Income Statement Data Abstract |  |  |  |  |  |  |  |  |
Interest Income (Expense), Operating | 56,574 |  |  | 67,139 |  |  | 172,575 | 219,883 |
Net intersegment interest income (expense) | 135,862 |  |  | 123,900 |  |  | 401,353 | 317,820 |
Segment net interest income | 192,436 |  |  | 191,039 |  |  | 573,928 | 537,703 |
Noninterest Income | 26,009 |  |  | 29,670 |  |  | 75,921 | 85,870 |
Revenues, Total | 218,445 |  |  | 220,709 |  |  | 649,848 | 623,573 |
Provision for Loan, Lease, and Other Losses | 5,195 |  |  | 7,381 |  |  | 17,611 | 21,467 |
Noninterest Expense | 115,656 |  |  | 108,127 |  |  | 333,711 | 328,790 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total | 97,594 |  |  | 105,202 |  |  | 298,526 | 273,316 |
Income Tax Expense (Benefit) | 20,495 |  |  | 22,092 |  |  | 62,691 | 57,396 |
Net Income (Loss) Attributable to Parent, Total | 77,099 |  |  | 83,109 |  |  | 235,835 | 215,920 |
Goodwill | 579,156 |  |  | 579,156 |  |  | 579,156 | 579,156 |
Operating Segments | Risk Management and Shared Serivies [Member] |  |  |  |  |  |  |  |  |
Segment Income Statement Data Abstract |  |  |  |  |  |  |  |  |
Interest Income (Expense), Operating | (49,001) |  |  | (63,260) |  |  | (144,677) | (143,743) |
Net intersegment interest income (expense) | (36,964) |  |  | (17,225) |  |  | (109,481) | (29,454) |
Segment net interest income | (85,964) |  |  | (80,485) |  |  | (254,158) | (173,197) |
Noninterest Income | 4,196 |  |  | 2,823 |  |  | 14,874 | 9,071 |
Revenues, Total | (81,768) |  |  | (77,663) |  |  | (239,284) | (164,126) |
Provision for Loan, Lease, and Other Losses | (1,213) |  |  | 496 |  |  | 1,459 | (975) |
Noninterest Expense | 19,526 |  |  | 24,814 |  |  | 63,245 | 58,980 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total | (100,081) |  |  | (102,972) |  |  | (303,988) | (222,131) |
Income Tax Expense (Benefit) | (21,370) |  |  | (21,959) |  |  | (95,085) | (41,202) |
Net Income (Loss) Attributable to Parent, Total | (78,711) |  |  | (81,013) |  |  | (208,902) | (180,929) |
Goodwill | $ 0 |  |  | $ 0 |  |  | $ 0 | $ 0 |

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