Loans Receivable and Allowance for Credit Losses - Schedule of Aging Analysis of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	$ 58,100,749	$ 56,878,172
Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	57,751,730	56,562,628
Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	168,371	149,702
Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	89,714	107,134
Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	78,657	42,568
Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	180,648	165,842
Commercial Lending
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	40,983,256	39,912,528
Commercial Lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	40,796,704	39,752,345
Commercial Lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	69,385	41,291
Commercial Lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	24,660	37,740
Commercial Lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	44,725	3,551
Commercial Lending | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	117,167	118,892
Commercial Lending | C&I
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	19,550,953	18,650,755
Commercial Lending | C&I | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	19,471,033	18,572,467
Commercial Lending | C&I | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	18,857	26,044
Commercial Lending | C&I | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	13,266	25,962
Commercial Lending | C&I | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,591	82
Commercial Lending | C&I | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	61,063	52,244
Commercial Lending | CRE
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,491,057	15,407,088
Commercial Lending | CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,409,331	15,354,548
Commercial Lending | CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	45,231	13,994
Commercial Lending | CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	6,097	10,525
Commercial Lending | CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	39,134	3,469
Commercial Lending | CRE | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	36,495	38,546
Commercial Lending | Multifamily residential
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,129,247	5,112,328
Commercial Lending | Multifamily residential | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,123,675	5,110,783
Commercial Lending | Multifamily residential | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,297	1,253
Commercial Lending | Multifamily residential | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,297	1,253
Commercial Lending | Multifamily residential | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	0	0
Commercial Lending | Multifamily residential | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	275	292
Commercial Lending | Construction and land
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	811,999	742,357
Commercial Lending | Construction and land | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	792,665	714,547
Commercial Lending | Construction and land | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	0	0
Commercial Lending | Construction and land | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	0	0
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	19,334	27,810
Commercial Lending | Total CRE
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	21,432,303	21,261,773
Commercial Lending | Total CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	21,325,671	21,179,878
Commercial Lending | Total CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	50,528	15,247
Commercial Lending | Total CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	11,394	11,778
Commercial Lending | Total CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	39,134	3,469
Commercial Lending | Total CRE | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	56,104	66,648
Consumer Lending
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,117,493	16,965,644
Consumer Lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,955,026	16,810,283
Consumer Lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	98,986	108,411
Consumer Lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	65,054	69,394
Consumer Lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	33,932	39,017
Consumer Lending | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	63,481	46,950
Consumer Lending | Single-family residential (“SFR”)
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,119,709	15,002,549
Consumer Lending | Single-family residential (“SFR”) | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,009,884	14,899,224
Consumer Lending | Single-family residential (“SFR”) | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	75,331	73,684
Consumer Lending | Single-family residential (“SFR”) | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	46,542	46,010
Consumer Lending | Single-family residential (“SFR”) | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	28,789	27,674
Consumer Lending | Single-family residential (“SFR”) | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	34,494	29,641
Consumer Lending | Home equity lines of credit (“HELOCs”)
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,945,867	1,911,897
Consumer Lending | Home equity lines of credit (“HELOCs”) | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,893,351	1,860,080
Consumer Lending | Home equity lines of credit (“HELOCs”) | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	23,558	34,650
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	18,452	23,328
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	5,106	11,322
Consumer Lending | Home equity lines of credit (“HELOCs”) | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	28,958	17,167
Consumer Lending | Total residential mortgage
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,065,576	16,914,446
Consumer Lending | Total residential mortgage | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	16,903,235	16,759,304
Consumer Lending | Total residential mortgage | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	98,889	108,334
Consumer Lending | Total residential mortgage | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	64,994	69,338
Consumer Lending | Total residential mortgage | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	33,895	38,996
Consumer Lending | Total residential mortgage | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	63,452	46,808
Consumer Lending | Other consumer
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	51,917	51,198
Consumer Lending | Other consumer | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	51,791	50,979
Consumer Lending | Other consumer | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	97	77
Consumer Lending | Other consumer | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	60	56
Consumer Lending | Other consumer | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	37	21
Consumer Lending | Other consumer | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	$ 29	$ 142