Loans Receivable and Allowance for Credit Losses - Schedule Of Aging Analysis Of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	$ 54,252,734	$ 53,726,637
Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	53,975,683	53,462,858
Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	123,851	104,761
Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	84,228	55,354
Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	39,623	49,407
Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	153,200	159,018
Commercial lending
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	37,990,704	37,672,102
Commercial lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	37,877,956	37,537,266
Commercial lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	27,061	30,353
Commercial lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	26,661	11,025
Commercial lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	400	19,328
Commercial lending | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	85,687	104,483
Commercial lending | C&I
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,460,744	17,397,158
Commercial lending | C&I | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,359,512	17,288,138
Commercial lending | C&I | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	25,653	22,855
Commercial lending | C&I | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	25,254	5,690
Commercial lending | C&I | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	399	17,165
Commercial lending | C&I | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	75,579	86,165
Commercial lending | CRE
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,868,361	14,655,340
Commercial lending | CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,862,806	14,647,270
Commercial lending | CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1	5,640
Commercial lending | CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	0	3,755
Commercial lending | CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1	1,885
Commercial lending | CRE | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,554	2,430
Commercial lending | Multifamily residential
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,007,969	4,953,442
Commercial lending | Multifamily residential | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,002,008	4,947,939
Commercial lending | Multifamily residential | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,407	931
Commercial lending | Multifamily residential | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,407	653
Commercial lending | Multifamily residential | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	0	278
Commercial lending | Multifamily residential | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	4,554	4,572
Commercial lending | Construction and land
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	653,630	666,162
Commercial lending | Construction and land | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	653,630	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	0	11,316
Commercial lending | Total CRE
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	20,529,960	20,274,944
Commercial lending | Total CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	20,518,444	20,249,128
Commercial lending | Total CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,408	7,498
Commercial lending | Total CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,407	5,335
Commercial lending | Total CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1	2,163
Commercial lending | Total CRE | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	10,108	18,318
Consumer lending
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,262,030	16,054,535
Consumer lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,097,727	15,925,592
Consumer lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	96,790	74,408
Consumer lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	57,567	44,329
Consumer lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	39,223	30,079
Consumer lending | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	67,513	54,535
Consumer lending | Single-family residential
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,383,562	14,175,446
Consumer lending | Single-family residential | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,276,842	14,088,086
Consumer lending | Single-family residential | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	64,554	54,937
Consumer lending | Single-family residential | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	47,184	32,841
Consumer lending | Single-family residential | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,370	22,096
Consumer lending | Single-family residential | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	42,166	32,423
Consumer lending | Home equity lines of credit (“HELOCs”)
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,827,837	1,811,628
Consumer lending | Home equity lines of credit (“HELOCs”) | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,772,312	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	30,275	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	8,500	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	21,775	7,968
Consumer lending | Home equity lines of credit (“HELOCs”) | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	25,250	22,046
Consumer lending | Total residential mortgage
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,211,399	15,987,074
Consumer lending | Total residential mortgage | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,049,154	15,858,304
Consumer lending | Total residential mortgage | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	94,829	74,301
Consumer lending | Total residential mortgage | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	55,684	44,237
Consumer lending | Total residential mortgage | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	39,145	30,064
Consumer lending | Total residential mortgage | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	67,416	54,469
Consumer lending | Other consumer
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	50,631	67,461
Consumer lending | Other consumer | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	48,573	67,288
Consumer lending | Other consumer | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,961	107
Consumer lending | Other consumer | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,883	92
Consumer lending | Other consumer | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	78	15
Consumer lending | Other consumer | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	$ 97	$ 66