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Loans and Leases - Nonaccrual and Performing Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | $ 213,480 | $ 189,605 | $ 145,785
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 23,925,887 | 23,601,470 |
Loans held for investment, net | 24,126,527 | 23,781,663 | 25,473,022
Real Estate Mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | 198,948 | 167,206 | 129,234
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 13,303,254 | 13,268,343 |
Loans held for investment, net | 13,492,658 | 13,427,659 | 15,967,399
Real Estate Construction and Land |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | 0 | 0 | 0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 2,861,038 | 3,172,293 |
Loans held for investment, net | 2,861,038 | 3,172,293 | 3,245,354
Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | 13,540 | 21,775 | 15,715
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 7,370,539 | 6,761,249 |
Loans held for investment, net | 7,378,799 | 6,778,829 | 5,820,567
Consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | 992 | 624 | 836
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 391,056 | 399,585 |
Loans held for investment, net | 394,032 | 402,882 | $ 439,702
Performing |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 23,913,047 | 23,592,058 |
Performing | Real Estate Mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 13,293,710 | 13,260,453 |
Performing | Real Estate Construction and Land |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 2,861,038 | 3,172,293 |
Performing | Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 7,365,259 | 6,757,054 |
Performing | Consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 393,040 | 402,258 |
Venture Capital Loans | Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | 163 | 6,291 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 1,733,074 | 1,532,242 |
Loans held for investment, net | 1,733,074 | 1,537,776 |
Venture Capital Loans | Performing | Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 1,732,911 | 1,531,485 |
Other Commercial | Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | 9,737 | 13,544 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 3,333,657 | 3,142,833 |
Loans held for investment, net | 3,340,400 | 3,153,084 |
Other Commercial | Performing | Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 3,330,663 | 3,139,540 |
Asset Based | Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | 3,640 | 1,940 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 2,303,808 | 2,086,174 |
Loans held for investment, net | 2,305,325 | 2,087,969 |
Asset Based | Performing | Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 2,301,685 | 2,086,029 |
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | 0 | 0 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 733,684 | 799,131 |
Loans held for investment, net | 733,684 | 799,131 |
Commercial Real Estate Construction Loan Receivable | Performing | Real Estate Construction and Land |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 733,684 | 799,131 |
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | 0 | 0 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 2,127,354 | 2,373,162 |
Loans held for investment, net | 2,127,354 | 2,373,162 |
Residential Real Estate Construction Financing Receivable | Performing | Real Estate Construction and Land |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 2,127,354 | 2,373,162 |
Commercial | Real Estate Mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | 131,595 | 97,655 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 4,397,443 | 4,528,511 |
Loans held for investment, net | 4,489,543 | 4,578,772 |
Commercial | Performing | Real Estate Mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 4,357,948 | 4,481,117 |
Multi-Family Real Estate Loans | Real Estate Mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | 22,614 | 22,763 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 6,192,555 | 6,009,507 |
Loans held for investment, net | 6,216,084 | 6,041,713 |
Multi-Family Real Estate Loans | Performing | Real Estate Mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 6,193,470 | 6,018,950 |
Other Residential Real Estate | Real Estate Mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual | 44,739 | 46,788 |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 2,713,256 | 2,730,325 |
Loans held for investment, net | 2,787,031 | 2,807,174 |
Other Residential Real Estate | Performing | Real Estate Mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current | $ 2,742,292 | $ 2,760,386 |

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