Loans Receivable and Allowance for Credit Losses - Schedule Of Aging Analysis Of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	$ 53,253,181	$ 52,210,782
Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	53,012,179	51,984,909
Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	94,142	122,999
Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	59,622	88,791
Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	34,520	34,208
Nonperforming Financial Instruments
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	146,860	102,874
Commercial lending
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	37,471,467	37,045,191
Commercial lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	37,356,862	36,927,223
Commercial lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	20,158	53,014
Commercial lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,345	44,117
Commercial lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	4,813	8,897
Commercial lending | Nonperforming Financial Instruments
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	94,447	64,954
Commercial lending | C&I
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,068,002	16,581,079
Commercial lending | C&I | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,978,259	16,508,394
Commercial lending | C&I | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,471	35,649
Commercial lending | C&I | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	10,974	28,550
Commercial lending | C&I | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	3,497	7,099
Commercial lending | C&I | Nonperforming Financial Instruments
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	75,272	37,036
Commercial lending | CRE
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,568,209	14,777,081
Commercial lending | CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,562,360	14,750,315
Commercial lending | CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	2,576	3,517
Commercial lending | CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,751	1,719
Commercial lending | CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	825	1,798
Commercial lending | CRE | Nonperforming Financial Instruments
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	3,273	23,249
Commercial lending | Multifamily residential
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,141,481	5,023,163
Commercial lending | Multifamily residential | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,133,784	5,017,897
Commercial lending | Multifamily residential | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	3,111	597
Commercial lending | Multifamily residential | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	2,620	597
Commercial lending | Multifamily residential | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	491	0
Commercial lending | Multifamily residential | Nonperforming Financial Instruments
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	4,586	4,669
Commercial lending | Construction and land
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	693,775	663,868
Commercial lending | Construction and land | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	682,459	650,617
Commercial lending | Construction and land | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	0	13,251
Commercial lending | Construction and land | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	0	13,251
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 | Nonperforming Financial Instruments
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	11,316	0
Commercial lending | Total CRE
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	20,403,465	20,464,112
Commercial lending | Total CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	20,378,603	20,418,829
Commercial lending | Total CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,687	17,365
Commercial lending | Total CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	4,371	15,567
Commercial lending | Total CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,316	1,798
Commercial lending | Total CRE | Nonperforming Financial Instruments
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	19,175	27,918
Consumer lending
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,781,714	15,165,591
Consumer lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,655,317	15,057,686
Consumer lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	73,984	69,985
Consumer lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	44,277	44,674
Consumer lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	29,707	25,311
Consumer lending | Nonperforming Financial Instruments
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	52,413	37,920
Consumer lending | Single-family residential
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	13,963,097	13,383,060
Consumer lending | Single-family residential | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	13,883,243	13,313,455
Consumer lending | Single-family residential | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	44,119	45,228
Consumer lending | Single-family residential | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	24,890	29,285
Consumer lending | Single-family residential | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	19,229	15,943
Consumer lending | Single-family residential | Nonperforming Financial Instruments
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	35,735	24,377
Consumer lending | HELOCs
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,760,716	1,722,204
Consumer lending | HELOCs | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,717,377	1,687,301
Consumer lending | HELOCs | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	26,763	21,492
Consumer lending | HELOCs | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	19,309	12,266
Consumer lending | HELOCs | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	7,454	9,226
Consumer lending | HELOCs | Nonperforming Financial Instruments
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,576	13,411
Consumer lending | Total residential mortgage
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,723,813	15,105,264
Consumer lending | Total residential mortgage | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,600,620	15,000,756
Consumer lending | Total residential mortgage | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	70,882	66,720
Consumer lending | Total residential mortgage | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	44,199	41,551
Consumer lending | Total residential mortgage | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	26,683	25,169
Consumer lending | Total residential mortgage | Nonperforming Financial Instruments
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	52,311	37,788
Consumer lending | Other consumer
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	57,901	60,327
Consumer lending | Other consumer | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	54,697	56,930
Consumer lending | Other consumer | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	3,102	3,265
Consumer lending | Other consumer | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	78	3,123
Consumer lending | Other consumer | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	3,024	142
Consumer lending | Other consumer | Nonperforming Financial Instruments
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	$ 102	$ 132