Loans and Leases Aging Analysis of Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	$ 144,188	$ 176,767
Delinquent loans in loan portfolio
30-89 Days Past Due		105,845
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		70,922
Current	25,345,499	28,432,362
Loans held for investment, net	25,489,687	28,609,129
30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	113,307
90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	30,881
Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	128,491	172,593
Delinquent loans in loan portfolio
Loans held for investment, net	16,111,985	15,730,324
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	15,983,494	15,557,731
Mortgages [Member] | 30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	107,962	103,449
Mortgages [Member] | 90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	20,529	69,144
Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	0	0
Delinquent loans in loan portfolio
Loans held for investment, net	3,159,269	4,152,172
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	3,159,269	4,152,172
Real Estate Construction [Member] | 30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	0	0
Real Estate Construction [Member] | 90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	11,566	2,090
Delinquent loans in loan portfolio
30-89 Days Past Due		461
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		1,629
Current	5,753,741	8,279,872
Loans held for investment, net	5,765,307	8,281,962
Commercial Portfolio Segment [Member] | 30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	1,884
Commercial Portfolio Segment [Member] | 90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	9,682
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	4,131	2,084
Delinquent loans in loan portfolio
30-89 Days Past Due		1,935
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		149
Current	448,995	442,587
Loans held for investment, net	453,126	444,671
Consumer Portfolio Segment [Member] | 30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	3,461
Consumer Portfolio Segment [Member] | 90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	670
Asset Based [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	3,297	434
Delinquent loans in loan portfolio
30-89 Days Past Due		0
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		434
Current	2,185,788	5,139,775
Loans held for investment, net	2,189,085	5,140,209
Asset Based [Member] | Commercial Portfolio Segment [Member] | 30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	608
Asset Based [Member] | Commercial Portfolio Segment [Member] | 90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	2,689
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	0	0
Delinquent loans in loan portfolio
30-89 Days Past Due		0
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		0
Current	1,446,362	2,033,302
Loans held for investment, net	1,446,362	2,033,302
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member] | 30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	0
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member] | 90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0
Other Commercial [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	8,269	1,656
Delinquent loans in loan portfolio
30-89 Days Past Due		461
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		1,195
Current	2,121,591	1,106,795
Loans held for investment, net	2,129,860	1,108,451
Other Commercial [Member] | Commercial Portfolio Segment [Member] | 30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	1,276
Other Commercial [Member] | Commercial Portfolio Segment [Member] | 90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	6,993
Commercial Real Estate Construction Loan Receivable [Member] | Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	0	0
Delinquent loans in loan portfolio
Loans held for investment, net	759,585	898,592
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	759,585	898,592
Commercial Real Estate Construction Loan Receivable [Member] | Real Estate Construction [Member] | 30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	0	0
Commercial Real Estate Construction Loan Receivable [Member] | Real Estate Construction [Member] | 90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Residential Real Estate Construction Financing Receivable [Member] | Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	0	0
Delinquent loans in loan portfolio
Loans held for investment, net	2,399,684	3,253,580
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	2,399,684	3,253,580
Residential Real Estate Construction Financing Receivable [Member] | Real Estate Construction [Member] | 30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	0	0
Residential Real Estate Construction Financing Receivable [Member] | Real Estate Construction [Member] | 90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Commercial Real Estate [Member] | Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	27,786	30,990
Delinquent loans in loan portfolio
Loans held for investment, net	5,026,497	3,846,831
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	4,998,711	3,815,841
Commercial Real Estate [Member] | Mortgages [Member] | 30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	12,618	1,721
Commercial Real Estate [Member] | Mortgages [Member] | 90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	15,168	29,269
Residential Real Estate [Member] | Mortgages [Member]
Delinquent loans in loan portfolio
Loans held for investment, net	6,025,179	5,607,865
Multi-Family Real Estate Loans | Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	3,322	0
Delinquent loans in loan portfolio
Loans held for investment, net	6,025,179	5,607,865
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	6,021,857	5,607,865
Multi-Family Real Estate Loans | Mortgages [Member] | 30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	2,302	0
Multi-Family Real Estate Loans | Mortgages [Member] | 90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,020	0
Other Residential Real Estate | Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Recorded Investment Total Past Due	97,383	141,603
Delinquent loans in loan portfolio
Loans held for investment, net	5,060,309	6,275,628
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	4,962,926	6,134,025
Other Residential Real Estate | Mortgages [Member] | 30 To 89 Days Past Due
Delinquent loans in loan portfolio
30-89 Days Past Due	93,042	101,728
Other Residential Real Estate | Mortgages [Member] | 90 Or More Days Past Due
Delinquent loans in loan portfolio
Loan Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	$ 4,341	$ 39,875