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Loans and Leases - Nonaccrual and Performing Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Financing Receivable, Impaired [Line Items]
Nonaccrual	$ 145,785	$ 62,527	$ 87,124
Loans held for investment, net	25,473,022	25,489,687	25,672,381
Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	129,234	47,730	83,056
Loans held for investment, net	15,967,399	16,111,985	15,407,611
Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	0	0
Loans held for investment, net	3,245,354	3,159,269	4,608,440
Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	15,715	13,986	3,543
Loans held for investment, net	5,820,567	5,765,307	5,229,107
Consumer
Financing Receivable, Impaired [Line Items]
Nonaccrual	836	811	525
Loans held for investment, net	439,702	453,126	$ 427,223
Performing
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	25,327,237	25,427,160
Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	15,838,165	16,064,255
Performing | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	3,245,354	3,159,269
Performing | Commercial
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	5,804,852	5,751,321
Performing | Consumer
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	438,866	452,315
Venture Capital Loans | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	325
Loans held for investment, net	1,513,641	1,446,362
Venture Capital Loans | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	1,513,641	1,446,037
Other Commercial | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	13,390	10,972
Loans held for investment, net	2,245,910	2,129,860
Other Commercial | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,232,520	2,118,888
Asset Based [Member] | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	2,325	2,689
Loans held for investment, net	2,061,016	2,189,085
Asset Based [Member] | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,058,691	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	775,021	759,585
Commercial Real Estate Construction Loan Receivable | Performing | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	775,021	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	2,470,333	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	2,470,333	2,399,684
Commercial | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	66,527	15,669
Loans held for investment, net	4,896,544	5,026,497
Commercial | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	4,830,017	5,010,828
Multi-Family Real Estate Loans | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	953	1,020
Loans held for investment, net	6,121,472	6,025,179
Multi-Family Real Estate Loans | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	6,120,519	6,024,159
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	61,754	31,041
Loans held for investment, net	4,949,383	5,060,309
Other Residential Real Estate | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	$ 4,887,629	$ 5,029,268

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

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-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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