Loans and Leases Held for Investment - Schedule of Credit Risk Rating Categories for Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Financing Receivable, Past Due [Line Items]
Total	$ 24,210,846	$ 25,032,679	$ 24,245,893
Classified
Financing Receivable, Past Due [Line Items]
Total	582,790	800,330
Special Mention
Financing Receivable, Past Due [Line Items]
Total	300,542	458,683
Pass
Financing Receivable, Past Due [Line Items]
Total	23,327,514	23,773,666
Real estate mortgage
Financing Receivable, Past Due [Line Items]
Total	13,276,580	13,750,787	13,807,808
Real estate mortgage \| Classified
Financing Receivable, Past Due [Line Items]
Total	439,215	522,193
Real estate mortgage \| Special Mention
Financing Receivable, Past Due [Line Items]
Total	217,828	343,284
Real estate mortgage \| Pass
Financing Receivable, Past Due [Line Items]
Total	12,619,537	12,885,310
Real estate mortgage \| Commercial
Financing Receivable, Past Due [Line Items]
Total	4,037,229	4,314,637
Real estate mortgage \| Commercial \| Classified
Financing Receivable, Past Due [Line Items]
Total	227,445	297,606
Real estate mortgage \| Commercial \| Special Mention
Financing Receivable, Past Due [Line Items]
Total	158,679	126,998
Real estate mortgage \| Commercial \| Pass
Financing Receivable, Past Due [Line Items]
Total	3,651,105	3,890,033
Real estate mortgage \| Multi-family
Financing Receivable, Past Due [Line Items]
Total	5,445,475	6,089,417
Real estate mortgage \| Multi-family \| Classified
Financing Receivable, Past Due [Line Items]
Total	157,819	166,385
Real estate mortgage \| Multi-family \| Special Mention
Financing Receivable, Past Due [Line Items]
Total	59,149	216,286
Real estate mortgage \| Multi-family \| Pass
Financing Receivable, Past Due [Line Items]
Total	5,228,507	5,706,746
Real estate mortgage \| Other residential
Financing Receivable, Past Due [Line Items]
Total	3,793,876	3,346,733
Real estate mortgage \| Other residential \| Classified
Financing Receivable, Past Due [Line Items]
Total	53,951	58,202
Real estate mortgage \| Other residential \| Special Mention
Financing Receivable, Past Due [Line Items]
Total	0	0
Real estate mortgage \| Other residential \| Pass
Financing Receivable, Past Due [Line Items]
Total	3,739,925	3,288,531
Real estate construction and land
Financing Receivable, Past Due [Line Items]
Total	1,474,851	1,947,627	2,302,091
Real estate construction and land \| Classified
Financing Receivable, Past Due [Line Items]
Total	2,385	55,810
Real estate construction and land \| Special Mention
Financing Receivable, Past Due [Line Items]
Total	4,036	10,714
Real estate construction and land \| Pass
Financing Receivable, Past Due [Line Items]
Total	1,468,430	1,881,103
Real estate construction and land \| Commercial
Financing Receivable, Past Due [Line Items]
Total	360,392	379,387
Real estate construction and land \| Commercial \| Classified
Financing Receivable, Past Due [Line Items]
Total	0	52,828
Real estate construction and land \| Commercial \| Special Mention
Financing Receivable, Past Due [Line Items]
Total	0	0
Real estate construction and land \| Commercial \| Pass
Financing Receivable, Past Due [Line Items]
Total	360,392	326,559
Real estate construction and land \| Residential
Financing Receivable, Past Due [Line Items]
Total	1,114,459	1,568,240
Real estate construction and land \| Residential \| Classified
Financing Receivable, Past Due [Line Items]
Total	2,385	2,982
Real estate construction and land \| Residential \| Special Mention
Financing Receivable, Past Due [Line Items]
Total	4,036	10,714
Real estate construction and land \| Residential \| Pass
Financing Receivable, Past Due [Line Items]
Total	1,108,038	1,554,544
Commercial
Financing Receivable, Past Due [Line Items]
Total	9,112,431	8,977,206	7,753,257
Commercial \| Classified
Financing Receivable, Past Due [Line Items]
Total	139,767	220,722
Commercial \| Special Mention
Financing Receivable, Past Due [Line Items]
Total	75,751	99,446
Commercial \| Pass
Financing Receivable, Past Due [Line Items]
Total	8,896,913	8,657,038
Commercial \| Asset-based
Financing Receivable, Past Due [Line Items]
Total	3,318,822	2,951,010
Commercial \| Asset-based \| Classified
Financing Receivable, Past Due [Line Items]
Total	15,255	36,732
Commercial \| Asset-based \| Special Mention
Financing Receivable, Past Due [Line Items]
Total	4,135	7,180
Commercial \| Asset-based \| Pass
Financing Receivable, Past Due [Line Items]
Total	3,299,432	2,907,098
Commercial \| Venture capital
Financing Receivable, Past Due [Line Items]
Total	2,440,075	2,222,097
Commercial \| Venture capital \| Classified
Financing Receivable, Past Due [Line Items]
Total	99,773	171,847
Commercial \| Venture capital \| Special Mention
Financing Receivable, Past Due [Line Items]
Total	36,182	64,577
Commercial \| Venture capital \| Pass
Financing Receivable, Past Due [Line Items]
Total	2,304,120	1,985,673
Commercial \| Other commercial
Financing Receivable, Past Due [Line Items]
Total	3,353,534	3,804,099
Commercial \| Other commercial \| Classified
Financing Receivable, Past Due [Line Items]
Total	24,739	12,143
Commercial \| Other commercial \| Special Mention
Financing Receivable, Past Due [Line Items]
Total	35,434	27,689
Commercial \| Other commercial \| Pass
Financing Receivable, Past Due [Line Items]
Total	3,293,361	3,764,267
Consumer
Financing Receivable, Past Due [Line Items]
Total	346,984	357,059	$ 382,737
Consumer \| Classified
Financing Receivable, Past Due [Line Items]
Total	1,423	1,605
Consumer \| Special Mention
Financing Receivable, Past Due [Line Items]
Total	2,927	5,239
Consumer \| Pass
Financing Receivable, Past Due [Line Items]
Total	$ 342,634	$ 350,215