Loans Receivable and Allowance for Credit Losses - Schedule Of Aging Analysis Of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	$ 54,961,184	$ 53,726,637
Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	54,670,279	53,462,858
Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	151,451	104,761
Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	88,807	55,354
Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	62,644	49,407
Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	139,454	159,018
Commercial lending
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	38,490,284	37,672,102
Commercial lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	38,354,444	37,537,266
Commercial lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	54,526	30,353
Commercial lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	21,832	11,025
Commercial lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	32,694	19,328
Commercial lending | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	81,314	104,483
Commercial lending | C&I
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,822,881	17,397,158
Commercial lending | C&I | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,737,893	17,288,138
Commercial lending | C&I | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	13,094	22,855
Commercial lending | C&I | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,711	5,690
Commercial lending | C&I | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	7,383	17,165
Commercial lending | C&I | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	71,894	86,165
Commercial lending | CRE
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,978,775	14,655,340
Commercial lending | CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,938,724	14,647,270
Commercial lending | CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	30,958	5,640
Commercial lending | CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,500	3,755
Commercial lending | CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,458	1,885
Commercial lending | CRE | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	9,093	2,430
Commercial lending | Multifamily residential
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	4,978,915	4,953,442
Commercial lending | Multifamily residential | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	4,977,011	4,947,939
Commercial lending | Multifamily residential | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,577	931
Commercial lending | Multifamily residential | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	621	653
Commercial lending | Multifamily residential | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	956	278
Commercial lending | Multifamily residential | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	327	4,572
Commercial lending | Construction and land
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	709,713	666,162
Commercial lending | Construction and land | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	700,816	653,919
Commercial lending | Construction and land | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	8,897	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	8,897	0
Commercial lending | Construction and land | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	0	11,316
Commercial lending | Total CRE
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	20,667,403	20,274,944
Commercial lending | Total CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	20,616,551	20,249,128
Commercial lending | Total CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	41,432	7,498
Commercial lending | Total CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,121	5,335
Commercial lending | Total CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	25,311	2,163
Commercial lending | Total CRE | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	9,420	18,318
Consumer lending
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,470,900	16,054,535
Consumer lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,315,835	15,925,592
Consumer lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	96,925	74,408
Consumer lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	66,975	44,329
Consumer lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	29,950	30,079
Consumer lending | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	58,140	54,535
Consumer lending | Single-family residential
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,569,997	14,175,446
Consumer lending | Single-family residential | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,459,445	14,088,086
Consumer lending | Single-family residential | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	77,305	54,937
Consumer lending | Single-family residential | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	52,101	32,841
Consumer lending | Single-family residential | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	25,204	22,096
Consumer lending | Single-family residential | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	33,247	32,423
Consumer lending | Home equity lines of credit (“HELOCs”)
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,850,965	1,811,628
Consumer lending | Home equity lines of credit (“HELOCs”) | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,806,711	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	19,498	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	14,821	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	4,677	7,968
Consumer lending | Home equity lines of credit (“HELOCs”) | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	24,756	22,046
Consumer lending | Total residential mortgage
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,420,962	15,987,074
Consumer lending | Total residential mortgage | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,266,156	15,858,304
Consumer lending | Total residential mortgage | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	96,803	74,301
Consumer lending | Total residential mortgage | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	66,922	44,237
Consumer lending | Total residential mortgage | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	29,881	30,064
Consumer lending | Total residential mortgage | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	58,003	54,469
Consumer lending | Other consumer
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	49,938	67,461
Consumer lending | Other consumer | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	49,679	67,288
Consumer lending | Other consumer | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	122	107
Consumer lending | Other consumer | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	53	92
Consumer lending | Other consumer | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	69	15
Consumer lending | Other consumer | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	$ 137	$ 66