Loans and Leases Credit Risk Rating Categories (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	$ 25,489,687	$ 28,609,129
Financing Receivable, Nonaccrual	62,527	103,778
Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	16,111,985	15,730,324
Financing Receivable, Nonaccrual	47,730	98,402
Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,159,269	4,152,172
Financing Receivable, Nonaccrual	0	0
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,765,307	8,281,962
Financing Receivable, Nonaccrual	13,986	5,210
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	453,126	444,671
Financing Receivable, Nonaccrual	811	166
Classified [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	228,417	118,271
Classified [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	188,848	107,905
Classified [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	0	0
Classified [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	38,410	10,091
Classified [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,159	275
Special Mention [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	513,312	566,259
Special Mention [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	382,240	224,886
Special Mention [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,757	136,489
Special Mention [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	121,123	197,976
Special Mention [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	7,192	6,908
Pass [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	24,747,958	27,924,599
Pass [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	15,540,897	15,397,533
Pass [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,156,512	4,015,683
Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,605,774	8,073,895
Pass [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	444,775	437,488
Performing Financing Receivable [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	25,427,160	28,505,351
Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	16,064,255	15,631,922
Performing Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,159,269	4,152,172
Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,751,321	8,276,752
Performing Financing Receivable [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	452,315	444,505
Asset Based [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,189,085	5,140,209
Financing Receivable, Nonaccrual	2,689	865
Asset Based [Member] | Classified [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,561	865
Asset Based [Member] | Special Mention [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	12,506	56,836
Asset Based [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,172,018	5,082,508
Asset Based [Member] | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,186,396	5,139,344
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,446,362	2,033,302
Financing Receivable, Nonaccrual	325	0
Venture Capital Loans [Member] | Classified [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	7,805	2,753
Venture Capital Loans [Member] | Special Mention [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	98,633	127,907
Venture Capital Loans [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,339,924	1,902,642
Venture Capital Loans [Member] | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,446,037	2,033,302
Other Commercial [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,129,860	1,108,451
Financing Receivable, Nonaccrual	10,972	4,345
Other Commercial [Member] | Classified [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	26,044	6,473
Other Commercial [Member] | Special Mention [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	9,984	13,233
Other Commercial [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,093,832	1,088,745
Other Commercial [Member] | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [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, Past Due [Line Items]
Loans held for investment, net	759,585	898,592
Financing Receivable, Nonaccrual	0	0
Commercial Real Estate Construction Loan Receivable [Member] | Classified [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	0	0
Commercial Real Estate Construction Loan Receivable [Member] | Special Mention [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	0	91,334
Commercial Real Estate Construction Loan Receivable [Member] | Pass [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	759,585	807,258
Commercial Real Estate Construction Loan Receivable [Member] | Performing Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	759,585	898,592
Residential Real Estate Construction Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,399,684	3,253,580
Financing Receivable, Nonaccrual	0	0
Residential Real Estate Construction Financing Receivable [Member] | Classified [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	0	0
Residential Real Estate Construction Financing Receivable [Member] | Special Mention [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,757	45,155
Residential Real Estate Construction Financing Receivable [Member] | Pass [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,396,927	3,208,425
Residential Real Estate Construction Financing Receivable [Member] | Performing Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,399,684	3,253,580
Commercial Real Estate [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,026,497	3,846,831
Financing Receivable, Nonaccrual	15,669	42,509
Commercial Real Estate [Member] | Classified [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	75,739	43,737
Commercial Real Estate [Member] | Special Mention [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	219,687	106,493
Commercial Real Estate [Member] | Pass [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,731,071	3,696,601
Commercial Real Estate [Member] | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,010,828	3,804,322
Residential Real Estate [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	6,025,179	5,607,865
Multi-Family Real Estate Loans | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	6,025,179	5,607,865
Financing Receivable, Nonaccrual	1,020	0
Multi-Family Real Estate Loans | Classified [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	74,954	3,611
Multi-Family Real Estate Loans | Special Mention [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	108,356	60,330
Multi-Family Real Estate Loans | Pass [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,841,869	5,543,924
Multi-Family Real Estate Loans | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	6,024,159	5,607,865
Other Residential Real Estate | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,060,309	6,275,628
Financing Receivable, Nonaccrual	31,041	55,893
Other Residential Real Estate | Classified [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	38,155	60,557
Other Residential Real Estate | Special Mention [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	54,197	58,063
Other Residential Real Estate | Pass [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,967,957	6,157,008
Other Residential Real Estate | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	$ 5,029,268	$ 6,219,735