Loans and Leases Held for Investment - Schedule of Nonaccrual and Performing Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Financing Receivable, Impaired [Line Items]
Total	$ 24,210,846	$ 25,032,679	$ 24,245,893
Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	203,712	159,168
Performing
Financing Receivable, Impaired [Line Items]
Total	24,007,134	24,873,511
Real estate mortgage
Financing Receivable, Impaired [Line Items]
Total	13,276,580	13,750,787	13,807,808
Real estate mortgage \| Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	172,706	154,676
Real estate mortgage \| Performing
Financing Receivable, Impaired [Line Items]
Total	13,103,874	13,596,111
Real estate mortgage \| Commercial
Financing Receivable, Impaired [Line Items]
Total	4,037,229	4,314,637
Real estate mortgage \| Commercial \| Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	107,116	93,334
Real estate mortgage \| Commercial \| Performing
Financing Receivable, Impaired [Line Items]
Total	3,930,113	4,221,303
Real estate mortgage \| Multi-family
Financing Receivable, Impaired [Line Items]
Total	5,445,475	6,089,417
Real estate mortgage \| Multi-family \| Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	11,639	3,358
Real estate mortgage \| Multi-family \| Performing
Financing Receivable, Impaired [Line Items]
Total	5,433,836	6,086,059
Real estate mortgage \| Other residential
Financing Receivable, Impaired [Line Items]
Total	3,793,876	3,346,733
Real estate mortgage \| Other residential \| Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	53,951	57,984
Real estate mortgage \| Other residential \| Performing
Financing Receivable, Impaired [Line Items]
Total	3,739,925	3,288,749
Real estate construction and land
Financing Receivable, Impaired [Line Items]
Total	1,474,851	1,947,627	2,302,091
Real estate construction and land \| Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	2,385	0
Real estate construction and land \| Performing
Financing Receivable, Impaired [Line Items]
Total	1,472,466	1,947,627
Real estate construction and land \| Commercial
Financing Receivable, Impaired [Line Items]
Total	360,392	379,387
Real estate construction and land \| Commercial \| Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	0	0
Real estate construction and land \| Commercial \| Performing
Financing Receivable, Impaired [Line Items]
Total	360,392	379,387
Real estate construction and land \| Residential
Financing Receivable, Impaired [Line Items]
Total	1,114,459	1,568,240
Real estate construction and land \| Residential \| Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	2,385	0
Real estate construction and land \| Residential \| Performing
Financing Receivable, Impaired [Line Items]
Total	1,112,074	1,568,240
Commercial
Financing Receivable, Impaired [Line Items]
Total	9,112,431	8,977,206	7,753,257
Commercial \| Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	27,436	3,135
Commercial \| Performing
Financing Receivable, Impaired [Line Items]
Total	9,084,995	8,974,071
Commercial \| Asset-based
Financing Receivable, Impaired [Line Items]
Total	3,318,822	2,951,010
Commercial \| Asset-based \| Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	0	0
Commercial \| Asset-based \| Performing
Financing Receivable, Impaired [Line Items]
Total	3,318,822	2,951,010
Commercial \| Venture capital
Financing Receivable, Impaired [Line Items]
Total	2,440,075	2,222,097
Commercial \| Venture capital \| Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	14,398	625
Commercial \| Venture capital \| Performing
Financing Receivable, Impaired [Line Items]
Total	2,425,677	2,221,472
Commercial \| Other commercial
Financing Receivable, Impaired [Line Items]
Total	3,353,534	3,804,099
Commercial \| Other commercial \| Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	13,038	2,510
Commercial \| Other commercial \| Performing
Financing Receivable, Impaired [Line Items]
Total	3,340,496	3,801,589
Consumer
Financing Receivable, Impaired [Line Items]
Total	346,984	357,059	$ 382,737
Consumer \| Nonaccrual
Financing Receivable, Impaired [Line Items]
Total	1,185	1,357
Consumer \| Performing
Financing Receivable, Impaired [Line Items]
Total	$ 345,799	$ 355,702