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Loans and Leases - Credit Risk Rating Categories for Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	$ 23,527,777	$ 25,489,687	$ 21,920,946
Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	13,334,406	16,111,985	14,034,491
Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,459,409	3,159,269	2,737,537
Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	6,319,472	5,765,307	4,754,430
Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	414,490	453,126	$ 394,488
Classified
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	533,591	228,417
Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	462,009	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	70,941	38,410
Classified | Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	641	1,159
Special Mention
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	711,888	513,312
Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	400,666	382,240
Special Mention | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	114,359	2,757
Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	188,955	121,123
Special Mention | Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	7,908	7,192
Pass
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	22,282,298	24,747,958
Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	12,471,731	15,540,897
Pass | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,345,050	3,156,512
Pass | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	6,059,576	5,605,774
Pass | Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	405,941	444,775
Venture Capital Loans | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,353,626	1,446,362
Venture Capital Loans | Classified | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	39,699	7,805
Venture Capital Loans | Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	145,441	98,633
Venture Capital Loans | Pass | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,168,486	1,339,924
Other Commercial | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,850,535	2,129,860
Other Commercial | Classified | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	25,511	26,044
Other Commercial | Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	32,358	9,984
Other Commercial | Pass | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,792,666	2,093,832
Asset Based [Member] | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,115,311	2,189,085
Asset Based [Member] | Classified | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,731	4,561
Asset Based [Member] | Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	11,156	12,506
Asset Based [Member] | Pass | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,098,424	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	836,902	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	111,195	0
Commercial Real Estate Construction Loan Receivable | Pass | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	725,707	759,585
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,622,507	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	3,164	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	2,619,343	2,396,927
Commercial | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,557,939	5,026,497
Commercial | Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	256,581	75,739
Commercial | Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	339,559	219,687
Commercial | Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,961,799	4,731,071
Multi-Family Real Estate Loans | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	6,009,280	6,025,179
Multi-Family Real Estate Loans | Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	152,288	74,954
Multi-Family Real Estate Loans | Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	46,332	108,356
Multi-Family Real Estate Loans | Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,810,660	5,841,869
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,767,187	5,060,309
Other Residential Real Estate | Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	53,140	38,155
Other Residential Real Estate | Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	14,775	54,197
Other Residential Real Estate | Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	$ 2,699,272	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
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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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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