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Loans and Leases - Credit Risk Rating Categories for Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	$ 25,473,022	$ 25,489,687	$ 25,672,381
Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	15,967,399	16,111,985	15,407,611
Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,245,354	3,159,269	4,608,440
Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,820,567	5,765,307	5,229,107
Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	439,702	453,126	$ 427,223
Classified
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	366,729	228,417
Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	315,581	188,848
Classified | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	0	0
Classified | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	50,170	38,410
Classified | Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	978	1,159
Special Mention
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	556,509	513,312
Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	322,267	382,240
Special Mention | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,005	2,757
Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	224,707	121,123
Special Mention | Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	6,530	7,192
Pass
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	24,549,784	24,747,958
Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	15,329,551	15,540,897
Pass | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,242,349	3,156,512
Pass | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,545,690	5,605,774
Pass | Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	432,194	444,775
Venture Capital Loans | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,513,641	1,446,362
Venture Capital Loans | Classified | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	10,453	7,805
Venture Capital Loans | Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	198,311	98,633
Venture Capital Loans | Pass | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,304,877	1,339,924
Other Commercial | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,245,910	2,129,860
Other Commercial | Classified | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	31,222	26,044
Other Commercial | Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	15,080	9,984
Other Commercial | Pass | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,199,608	2,093,832
Asset Based [Member] | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,061,016	2,189,085
Asset Based [Member] | Classified | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	8,495	4,561
Asset Based [Member] | Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	11,316	12,506
Asset Based [Member] | Pass | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,041,205	2,172,018
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	775,021	759,585
Commercial Real Estate Construction Loan Receivable | Classified | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	0	0
Commercial Real Estate Construction Loan Receivable | Special Mention | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	0	0
Commercial Real Estate Construction Loan Receivable | Pass | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	775,021	759,585
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,470,333	2,399,684
Residential Real Estate Construction Financing Receivable | Classified | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	0	0
Residential Real Estate Construction Financing Receivable | Special Mention | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,005	2,757
Residential Real Estate Construction Financing Receivable | Pass | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,467,328	2,396,927
Commercial | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,896,544	5,026,497
Commercial | Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	174,525	75,739
Commercial | Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	196,450	219,687
Commercial | Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,525,569	4,731,071
Multi-Family Real Estate Loans | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	6,121,472	6,025,179
Multi-Family Real Estate Loans | Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	74,646	74,954
Multi-Family Real Estate Loans | Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	94,218	108,356
Multi-Family Real Estate Loans | Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,952,608	5,841,869
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,949,383	5,060,309
Other Residential Real Estate | Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	66,410	38,155
Other Residential Real Estate | Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	31,599	54,197
Other Residential Real Estate | Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	$ 4,851,374	4,967,957
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Past Due [Line Items]
Loans held for investment, net		$ 25,489,687

X

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
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-URI https://asc.fasb.org//1943274/2147479319/326-20-50-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
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-Section 55
-Paragraph 80
-Publisher FASB
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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 310
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