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Loans and Leases - Credit Risk Rating Categories for Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	$ 23,228,909	$ 25,489,687	$ 22,258,210
Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	13,573,600	16,111,985	14,288,042
Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,357,597	3,159,269	2,465,523
Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,871,809	5,765,307	5,094,786
Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	425,903	453,126	$ 409,859
Classified
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	415,498	228,417
Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	355,085	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	59,523	38,410
Classified | Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	890	1,159
Special Mention
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	680,663	513,312
Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	350,052	382,240
Special Mention | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	110,774	2,757
Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	212,729	121,123
Special Mention | Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	7,108	7,192
Pass
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	22,132,748	24,747,958
Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	12,868,463	15,540,897
Pass | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,246,823	3,156,512
Pass | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,599,557	5,605,774
Pass | Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	417,905	444,775
Venture Capital Loans | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,456,122	1,446,362
Venture Capital Loans | Classified | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	20,278	7,805
Venture Capital Loans | Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	189,016	98,633
Venture Capital Loans | Pass | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,246,828	1,339,924
Other Commercial | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,446,974	2,129,860
Other Commercial | Classified | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	25,601	26,044
Other Commercial | Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	14,684	9,984
Other Commercial | Pass | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,406,689	2,093,832
Asset Based [Member] | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,968,713	2,189,085
Asset Based [Member] | Classified | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	13,644	4,561
Asset Based [Member] | Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	9,029	12,506
Asset Based [Member] | Pass | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,946,040	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	784,166	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	107,424	0
Commercial Real Estate Construction Loan Receivable | Pass | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	676,742	759,585
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,573,431	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	3,350	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	2,570,081	2,396,927
Commercial | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,722,585	5,026,497
Commercial | Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	188,537	75,739
Commercial | Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	273,747	219,687
Commercial | Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,260,301	4,731,071
Multi-Family Real Estate Loans | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,984,930	6,025,179
Multi-Family Real Estate Loans | Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	114,583	74,954
Multi-Family Real Estate Loans | Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	54,893	108,356
Multi-Family Real Estate Loans | Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,815,454	5,841,869
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,866,085	5,060,309
Other Residential Real Estate | Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	51,965	38,155
Other Residential Real Estate | Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	21,412	54,197
Other Residential Real Estate | Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	$ 2,792,708	4,967,957
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Past Due [Line Items]
Loans held for investment, net		$ 25,489,687

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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
-Name Accounting Standards Codification
-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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