Loans Receivable and Allowance for Credit Losses - Schedule Of Aging Analysis Of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	$ 55,766,772	$ 53,726,637
Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	55,470,505	53,462,858
Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	139,333	104,761
Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	89,299	55,354
Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	50,034	49,407
Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	156,934	159,018
Commercial lending
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	39,046,567	37,672,102
Commercial lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	38,886,083	37,537,266
Commercial lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	60,647	30,353
Commercial lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	37,732	11,025
Commercial lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	22,915	19,328
Commercial lending | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	99,837	104,483
Commercial lending | C&I
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	18,001,529	17,397,158
Commercial lending | C&I | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,920,668	17,288,138
Commercial lending | C&I | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	10,796	22,855
Commercial lending | C&I | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	3,949	5,690
Commercial lending | C&I | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	6,847	17,165
Commercial lending | C&I | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	70,065	86,165
Commercial lending | CRE
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,231,167	14,655,340
Commercial lending | CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,161,590	14,647,270
Commercial lending | CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	49,009	5,640
Commercial lending | CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	33,489	3,755
Commercial lending | CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,520	1,885
Commercial lending | CRE | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	20,568	2,430
Commercial lending | Multifamily residential
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,037,284	4,953,442
Commercial lending | Multifamily residential | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,036,135	4,947,939
Commercial lending | Multifamily residential | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	842	931
Commercial lending | Multifamily residential | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	294	653
Commercial lending | Multifamily residential | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	548	278
Commercial lending | Multifamily residential | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	307	4,572
Commercial lending | Construction and land
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	776,587	666,162
Commercial lending | Construction and land | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	767,690	653,919
Commercial lending | Construction and land | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	0	927
Commercial lending | Construction and land | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	0	927
Commercial lending | Construction and land | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	0	0
Commercial lending | Construction and land | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	8,897	11,316
Commercial lending | Total CRE
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	21,045,038	20,274,944
Commercial lending | Total CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	20,965,415	20,249,128
Commercial lending | Total CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	49,851	7,498
Commercial lending | Total CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	33,783	5,335
Commercial lending | Total CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,068	2,163
Commercial lending | Total CRE | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	29,772	18,318
Consumer lending
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,720,205	16,054,535
Consumer lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,584,422	15,925,592
Consumer lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	78,686	74,408
Consumer lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	51,567	44,329
Consumer lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	27,119	30,079
Consumer lending | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	57,097	54,535
Consumer lending | Single-family residential
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,820,911	14,175,446
Consumer lending | Single-family residential | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,729,285	14,088,086
Consumer lending | Single-family residential | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	57,954	54,937
Consumer lending | Single-family residential | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	37,066	32,841
Consumer lending | Single-family residential | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	20,888	22,096
Consumer lending | Single-family residential | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	33,672	32,423
Consumer lending | Home equity lines of credit (“HELOCs”)
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,852,408	1,811,628
Consumer lending | Home equity lines of credit (“HELOCs”) | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,808,419	1,770,218
Consumer lending | Home equity lines of credit (“HELOCs”) | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	20,637	19,364
Consumer lending | Home equity lines of credit (“HELOCs”) | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,465	11,396
Consumer lending | Home equity lines of credit (“HELOCs”) | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	6,172	7,968
Consumer lending | Home equity lines of credit (“HELOCs”) | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	23,352	22,046
Consumer lending | Total residential mortgage
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,673,319	15,987,074
Consumer lending | Total residential mortgage | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,537,704	15,858,304
Consumer lending | Total residential mortgage | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	78,591	74,301
Consumer lending | Total residential mortgage | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	51,531	44,237
Consumer lending | Total residential mortgage | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	27,060	30,064
Consumer lending | Total residential mortgage | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	57,024	54,469
Consumer lending | Other consumer
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	46,886	67,461
Consumer lending | Other consumer | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	46,718	67,288
Consumer lending | Other consumer | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	95	107
Consumer lending | Other consumer | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	36	92
Consumer lending | Other consumer | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	59	15
Consumer lending | Other consumer | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	$ 73	$ 66