Loans Receivable and Allowance for Credit Losses - Schedule of Aging Analysis of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	$ 58,963,940	$ 56,878,172
Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	58,590,222	56,562,628
Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	168,760	149,702
Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	127,025	107,134
Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	41,735	42,568
Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	204,958	165,842
Commercial Lending
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	41,531,689	39,912,528
Commercial Lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	41,333,258	39,752,345
Commercial Lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	60,617	41,291
Commercial Lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	58,160	37,740
Commercial Lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	2,457	3,551
Commercial Lending | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	137,814	118,892
Commercial Lending | C&I
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	19,862,701	18,650,755
Commercial Lending | C&I | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	19,773,856	18,572,467
Commercial Lending | C&I | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	40,153	26,044
Commercial Lending | C&I | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	39,092	25,962
Commercial Lending | C&I | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,061	82
Commercial Lending | C&I | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	48,692	52,244
Commercial Lending | CRE
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,585,610	15,407,088
Commercial Lending | CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,501,657	15,354,548
Commercial Lending | CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,736	13,994
Commercial Lending | CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	13,340	10,525
Commercial Lending | CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,396	3,469
Commercial Lending | CRE | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	69,217	38,546
Commercial Lending | Multifamily residential
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,251,556	5,112,328
Commercial Lending | Multifamily residential | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,245,573	5,110,783
Commercial Lending | Multifamily residential | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,728	1,253
Commercial Lending | Multifamily residential | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	5,728	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	255	292
Commercial Lending | Construction and land
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	831,822	742,357
Commercial Lending | Construction and land | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	812,172	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	19,650	27,810
Commercial Lending | Total CRE
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	21,668,988	21,261,773
Commercial Lending | Total CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	21,559,402	21,179,878
Commercial Lending | Total CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	20,464	15,247
Commercial Lending | Total CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	19,068	11,778
Commercial Lending | Total CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,396	3,469
Commercial Lending | Total CRE | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	89,122	66,648
Consumer Lending
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,432,251	16,965,644
Consumer Lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,256,964	16,810,283
Consumer Lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	108,143	108,411
Consumer Lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	68,865	69,394
Consumer Lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	39,278	39,017
Consumer Lending | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	67,144	46,950
Consumer Lending | SFR — Traditional
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	13,818,417	13,692,025
Consumer Lending | SFR — Traditional | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	13,724,214	13,606,733
Consumer Lending | SFR — Traditional | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	59,820	58,550
Consumer Lending | SFR — Traditional | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	38,187	34,282
Consumer Lending | SFR — Traditional | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	21,633	24,268
Consumer Lending | SFR — Traditional | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	34,383	26,742
Consumer Lending | SFR —BTHO
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,517,892	1,310,524
Consumer Lending | SFR —BTHO | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,494,682	1,292,491
Consumer Lending | SFR —BTHO | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	19,232	15,134
Consumer Lending | SFR —BTHO | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	14,472	11,728
Consumer Lending | SFR —BTHO | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	4,760	3,406
Consumer Lending | SFR —BTHO | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	3,978	2,899
Consumer Lending | Home equity loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	2,039,285	1,911,897
Consumer Lending | Home equity loans | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	1,982,279	1,860,080
Consumer Lending | Home equity loans | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	28,285	34,650
Consumer Lending | Home equity loans | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	15,408	23,328
Consumer Lending | Home equity loans | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	12,877	11,322
Consumer Lending | Home equity loans | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	28,721	17,167
Consumer Lending | Total residential mortgage
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,375,594	16,914,446
Consumer Lending | Total residential mortgage | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	17,201,175	16,759,304
Consumer Lending | Total residential mortgage | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	107,337	108,334
Consumer Lending | Total residential mortgage | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	68,067	69,338
Consumer Lending | Total residential mortgage | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	39,270	38,996
Consumer Lending | Total residential mortgage | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	67,082	46,808
Consumer Lending | Other consumer
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	56,657	51,198
Consumer Lending | Other consumer | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	55,789	50,979
Consumer Lending | Other consumer | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	806	77
Consumer Lending | Other consumer | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	798	56
Consumer Lending | Other consumer | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	8	21
Consumer Lending | Other consumer | Total Nonaccrual Loans
Current, Past Due or Nonaccrual Loans
Loans held-for-investment	$ 62	$ 142