Loans and Leases (Details 3) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	$ 28,609,129	$ 22,941,548
Financing Receivable, Nonaccrual	103,778	61,174
Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	15,243,612	11,178,720
Financing Receivable, Nonaccrual	87,781	39,832
Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,638,884	3,437,127
Financing Receivable, Nonaccrual	10,621	4,715
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	8,281,962	7,868,051
Financing Receivable, Nonaccrual	5,210	16,213
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	444,671	457,650
Financing Receivable, Nonaccrual	166	414
Classified [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	118,271	116,104
Classified [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	96,944	79,906
Classified [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	10,961	4,715
Classified [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	10,091	31,044
Classified [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	275	439
Special Mention [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	566,259	391,611
Special Mention [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	189,181	211,657
Special Mention [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	172,194	69,447
Special Mention [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	197,976	108,666
Special Mention [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	6,908	1,841
Pass [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	27,924,599	22,433,833
Pass [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	14,957,487	10,887,157
Pass [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,455,729	3,362,965
Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	8,073,895	7,728,341
Pass [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	437,488	455,370
Performing Financing Receivable [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	28,505,351	22,880,374
Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	15,155,831	11,138,888
Performing Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,628,263	3,432,412
Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	8,276,752	7,851,838
Performing Financing Receivable [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	444,505	457,236
Asset Based [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,140,209	4,075,477
Financing Receivable, Nonaccrual	865	1,464
Asset Based [Member] | Classified [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	865	4,591
Asset Based [Member] | Special Mention [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	56,836	78,305
Asset Based [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,082,508	3,992,581
Asset Based [Member] | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,139,344	4,074,013
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,033,302	2,320,593
Financing Receivable, Nonaccrual	0	2,799
Venture Capital Loans [Member] | Classified [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,753	4,794
Venture Capital Loans [Member] | Special Mention [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	127,907	14,833
Venture Capital Loans [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,902,642	2,300,966
Venture Capital Loans [Member] | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,033,302	2,317,794
Other Commercial [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,108,451	1,471,981
Financing Receivable, Nonaccrual	4,345	11,950
Other Commercial [Member] | Classified [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	6,473	21,659
Other Commercial [Member] | Special Mention [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	13,233	15,528
Other Commercial [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,088,745	1,434,794
Other Commercial [Member] | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,104,106	1,460,031
Commercial Real Estate Construction Loan Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	898,592	832,591
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	91,334	67,727
Commercial Real Estate Construction Loan Receivable [Member] | Pass [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	807,258	764,864
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	898,592	832,591
Residential Real Estate Construction Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,740,292	2,604,536
Financing Receivable, Nonaccrual	10,621	4,715
Residential Real Estate Construction Financing Receivable [Member] | Classified [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	10,961	4,715
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	80,860	1,720
Residential Real Estate Construction Financing Receivable [Member] | Pass [Member] | Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,648,471	2,598,101
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	3,729,671	2,599,821
Commercial Real Estate [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,846,831	3,762,299
Financing Receivable, Nonaccrual	42,509	27,540
Commercial Real Estate [Member] | Classified [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	43,737	62,206
Commercial Real Estate [Member] | Special Mention [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	106,493	191,809
Commercial Real Estate [Member] | Pass [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,696,601	3,508,284
Commercial Real Estate [Member] | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,804,322	3,734,759
Residential Real Estate [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	11,396,781	7,416,421
Financing Receivable, Nonaccrual	45,272	12,292
Residential Real Estate [Member] | Classified [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	53,207	17,700
Residential Real Estate [Member] | Special Mention [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	82,688	19,848
Residential Real Estate [Member] | Pass [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	11,260,886	7,378,873
Residential Real Estate [Member] | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	$ 11,351,509	$ 7,404,129