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Loans and Leases Held for Investment - Nonaccrual and Performing Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Financing Receivable, Impaired [Line Items]
Nonaccrual	$ 174,541	$ 189,605	$ 168,341
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	23,949,274	23,601,470
Loans held for investment, net	24,110,642	23,781,663	23,527,777
Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	166,810	167,206	129,908
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	13,426,742	13,268,343
Loans held for investment, net	13,579,862	13,427,659	13,334,406
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	2,154,826	3,172,293
Loans held for investment, net	2,154,826	3,172,293	3,459,409
Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	6,779	21,775	37,914
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	8,001,994	6,761,249
Loans held for investment, net	8,006,657	6,778,829	6,319,472
Consumer
Financing Receivable, Impaired [Line Items]
Nonaccrual	952	624	519
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	365,712	399,585
Loans held for investment, net	369,297	402,882	$ 414,490
Performing
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	23,936,101	23,592,058
Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	13,413,052	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	2,154,826	3,172,293
Performing | Commercial
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	7,999,878	6,757,054
Performing | Consumer
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	368,345	402,258
Venture Capital Loans | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	6,291
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	1,907,601	1,532,242
Loans held for investment, net	1,907,601	1,537,776
Venture Capital Loans | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	1,907,601	1,531,485
Other Commercial | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	6,676	13,544
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	3,351,874	3,142,833
Loans held for investment, net	3,356,537	3,153,084
Other Commercial | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	3,349,861	3,139,540
Asset Based | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	103	1,940
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,742,519	2,086,174
Loans held for investment, net	2,742,519	2,087,969
Asset Based | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,742,416	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	395,150	799,131
Loans held for investment, net	395,150	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	395,150	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	1,759,676	2,373,162
Loans held for investment, net	1,759,676	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	1,759,676	2,373,162
Commercial | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	99,103	97,655
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	4,238,197	4,528,511
Loans held for investment, net	4,292,625	4,578,772
Commercial | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	4,193,522	4,481,117
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	66,866	46,788
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	3,063,872	2,730,325
Loans held for investment, net	3,162,564	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	3,095,698	2,760,386
Multifamily | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	841	22,763
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	6,124,673	6,009,507
Loans held for investment, net	6,124,673	6,041,713
Multifamily | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	$ 6,123,832	$ 6,018,950

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable classified as current. Excludes net investment in lease.

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