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Loans and Leases - Nonaccrual and Performing Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Financing Receivable, Impaired [Line Items]
Nonaccrual	$ 168,341	$ 62,527	$ 125,396
Loans held for investment, net	23,527,777	25,489,687	21,920,946
Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	129,908	47,730	119,794
Loans held for investment, net	13,334,406	16,111,985	14,034,491
Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	0	0
Loans held for investment, net	3,459,409	3,159,269	2,737,537
Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	37,914	13,986	5,395
Loans held for investment, net	6,319,472	5,765,307	4,754,430
Consumer
Financing Receivable, Impaired [Line Items]
Nonaccrual	519	811	207
Loans held for investment, net	414,490	453,126	$ 394,488
Performing
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	23,359,436	25,427,160
Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	13,204,498	16,064,255
Performing | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	3,459,409	3,159,269
Performing | Commercial
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	6,281,558	5,751,321
Performing | Consumer
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	413,971	452,315
Venture Capital Loans | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	19,957	325
Loans held for investment, net	1,353,626	1,446,362
Venture Capital Loans | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	1,333,669	1,446,037
Other Commercial | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	15,662	10,972
Loans held for investment, net	2,850,535	2,129,860
Other Commercial | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,834,873	2,118,888
Asset Based [Member] | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	2,295	2,689
Loans held for investment, net	2,115,311	2,189,085
Asset Based [Member] | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,113,016	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	836,902	759,585
Commercial Real Estate Construction Loan Receivable | Performing | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	836,902	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	2,622,507	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	2,622,507	2,399,684
Commercial | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	78,478	15,669
Loans held for investment, net	4,557,939	5,026,497
Commercial | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	4,479,461	5,010,828
Multi-Family Real Estate Loans | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	916	1,020
Loans held for investment, net	6,009,280	6,025,179
Multi-Family Real Estate Loans | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	6,008,364	6,024,159
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	50,514	31,041
Loans held for investment, net	2,767,187	5,060,309
Other Residential Real Estate | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	$ 2,716,673	$ 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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