Loans and Leases Nonaccrual and Performing Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	$ 159,168	$ 189,605
Loans held for investment, net	25,032,679	23,781,663
Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	154,676	167,206
Loans held for investment, net	13,750,787	13,427,659
Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	0	0
Loans held for investment, net	1,947,627	3,172,293
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	3,135	21,775
Loans held for investment, net	8,977,206	6,778,829
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	1,357	624
Loans held for investment, net	357,059	402,882
Performing Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	24,873,511	23,592,058
Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	13,596,111	13,260,453
Performing Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	1,947,627	3,172,293
Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	8,974,071	6,757,054
Performing Financing Receivable [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	355,702	402,258
Asset-based | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	0	1,940
Loans held for investment, net	2,951,010	2,087,969
Asset-based | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,951,010	2,086,029
Venture capital | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	625	6,291
Loans held for investment, net	2,222,097	1,537,776
Venture capital | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,221,472	1,531,485
Other commercial | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	2,510	13,544
Loans held for investment, net	3,804,099	3,153,084
Other commercial | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	3,801,589	3,139,540
Commercial Real Estate Construction Loan Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	0	0
Loans held for investment, net	379,387	799,131
Commercial Real Estate Construction Loan Receivable [Member] | Performing Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	379,387	799,131
Residential Real Estate Construction Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	0	0
Loans held for investment, net	1,568,240	2,373,162
Residential Real Estate Construction Financing Receivable [Member] | Performing Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	1,568,240	2,373,162
Commercial Real Estate [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	93,334	97,655
Loans held for investment, net	4,314,637	4,578,772
Commercial Real Estate [Member] | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	4,221,303	4,481,117
Residential Real Estate [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	6,089,417	6,041,713
Multi-Family Real Estate Loans | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	3,358	22,763
Loans held for investment, net	6,089,417	6,041,713
Multi-Family Real Estate Loans | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	6,086,059	6,018,950
Other Residential Real Estate | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	57,984	46,788
Loans held for investment, net	3,346,733	2,807,174
Other Residential Real Estate | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	$ 3,288,749	$ 2,760,386