Loans and Leases Nonaccrual and Performing Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	$ 62,527	$ 103,778
Loans held for investment, net	25,489,687	28,609,129
Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	47,730	98,402
Loans held for investment, net	16,111,985	15,730,324
Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	0	0
Loans held for investment, net	3,159,269	4,152,172
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	13,986	5,210
Loans held for investment, net	5,765,307	8,281,962
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	811	166
Loans held for investment, net	453,126	444,671
Performing Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	25,427,160	28,505,351
Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	16,064,255	15,631,922
Performing Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	3,159,269	4,152,172
Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	5,751,321	8,276,752
Performing Financing Receivable [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	452,315	444,505
Asset Based [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	2,689	865
Loans held for investment, net	2,189,085	5,140,209
Asset Based [Member] | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,186,396	5,139,344
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	325	0
Loans held for investment, net	1,446,362	2,033,302
Venture Capital Loans [Member] | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	1,446,037	2,033,302
Other Commercial [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	10,972	4,345
Loans held for investment, net	2,129,860	1,108,451
Other Commercial [Member] | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,118,888	1,104,106
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	759,585	898,592
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	759,585	898,592
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	2,399,684	3,253,580
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	2,399,684	3,253,580
Commercial Real Estate [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	15,669	42,509
Loans held for investment, net	5,026,497	3,846,831
Commercial Real Estate [Member] | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	5,010,828	3,804,322
Residential Real Estate [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	6,025,179	5,607,865
Multi-Family Real Estate Loans | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	1,020	0
Loans held for investment, net	6,025,179	5,607,865
Multi-Family Real Estate Loans | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	6,024,159	5,607,865
Other Residential Real Estate | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	31,041	55,893
Loans held for investment, net	5,060,309	6,275,628
Other Residential Real Estate | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	$ 5,029,268	$ 6,219,735