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Loans and Leases - Nonaccrual and Performing Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Financing Receivable, Impaired [Line Items]
Nonaccrual	$ 117,070	$ 62,527	$ 104,886
Loans held for investment, net	23,228,909	25,489,687	22,258,210
Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	95,264	47,730	100,817
Loans held for investment, net	13,573,600	16,111,985	14,288,042
Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	0	0
Loans held for investment, net	3,357,597	3,159,269	2,465,523
Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	21,006	13,986	3,864
Loans held for investment, net	5,871,809	5,765,307	5,094,786
Consumer
Financing Receivable, Impaired [Line Items]
Nonaccrual	800	811	205
Loans held for investment, net	425,903	453,126	$ 409,859
Performing
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	23,111,839	25,427,160
Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	13,478,336	16,064,255
Performing | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	3,357,597	3,159,269
Performing | Commercial
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	5,850,803	5,751,321
Performing | Consumer
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	425,103	452,315
Venture Capital Loans | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	325
Loans held for investment, net	1,456,122	1,446,362
Venture Capital Loans | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	1,456,122	1,446,037
Other Commercial | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	12,925	10,972
Loans held for investment, net	2,446,974	2,129,860
Other Commercial | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,434,049	2,118,888
Asset Based [Member] | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	8,081	2,689
Loans held for investment, net	1,968,713	2,189,085
Asset Based [Member] | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	1,960,632	2,186,396
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	0
Loans held for investment, net	784,166	759,585
Commercial Real Estate Construction Loan Receivable | Performing | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	784,166	759,585
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	0
Loans held for investment, net	2,573,431	2,399,684
Residential Real Estate Construction Financing Receivable | Performing | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,573,431	2,399,684
Commercial | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	62,498	15,669
Loans held for investment, net	4,722,585	5,026,497
Commercial | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	4,660,087	5,010,828
Multi-Family Real Estate Loans | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	934	1,020
Loans held for investment, net	5,984,930	6,025,179
Multi-Family Real Estate Loans | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	5,983,996	6,024,159
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	31,832	31,041
Loans held for investment, net	2,866,085	5,060,309
Other Residential Real Estate | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	$ 2,834,253	$ 5,029,268

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Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
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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.

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