Loans and Leases Nonaccrual and Performing Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	$ 189,605	$ 62,527
Loans held for investment, net	23,781,663	25,489,687
Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	167,206	47,730
Loans held for investment, net	13,427,659	16,111,985
Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	0	0
Loans held for investment, net	3,172,293	3,159,269
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	21,775	13,986
Loans held for investment, net	6,778,829	5,765,307
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	624	811
Loans held for investment, net	402,882	453,126
Performing Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	23,592,058	25,427,160
Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	13,260,453	16,064,255
Performing Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	3,172,293	3,159,269
Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	6,757,054	5,751,321
Performing Financing Receivable [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	402,258	452,315
Asset-based | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	1,940	2,689
Loans held for investment, net	2,087,969	2,189,085
Asset-based | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,086,029	2,186,396
Venture capital | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	6,291	325
Loans held for investment, net	1,537,776	1,446,362
Venture capital | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	1,531,485	1,446,037
Other commercial | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	13,544	10,972
Loans held for investment, net	3,153,084	2,129,860
Other commercial | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	3,139,540	2,118,888
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	799,131	759,585
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	799,131	759,585
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	2,373,162	2,399,684
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	2,373,162	2,399,684
Commercial Real Estate [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	97,655	15,669
Loans held for investment, net	4,578,772	5,026,497
Commercial Real Estate [Member] | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	4,481,117	5,010,828
Residential Real Estate [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	6,041,713	6,025,179
Multi-Family Real Estate Loans | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	22,763	1,020
Loans held for investment, net	6,041,713	6,025,179
Multi-Family Real Estate Loans | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	6,018,950	6,024,159
Other Residential Real Estate | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	46,788	31,041
Loans held for investment, net	2,807,174	5,060,309
Other Residential Real Estate | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	$ 2,760,386	$ 5,029,268