Loans Receivable and Allowance for Credit Losses - Aging Analysis on Loans Held-for-Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	$ 115,533	$ 99,526
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	49,828,364	48,202,430
Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	49,624,742	48,040,733
Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	88,089	62,171
Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	73,315	42,677
Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	14,774	19,494
Commercial lending
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	82,477	73,841
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	35,588,717	34,780,453
Commercial lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	35,462,899	34,682,072
Commercial lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	43,341	24,540
Commercial lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	40,950	21,345
Commercial lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	2,391	3,195
Commercial lending | Commercial and industrial (“C&I”)
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	61,879	50,428
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	15,670,084	15,711,095
Commercial lending | Commercial and industrial (“C&I”) | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	15,602,567	15,651,312
Commercial lending | Commercial and industrial (“C&I”) | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	5,638	9,355
Commercial lending | Commercial and industrial (“C&I”) | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	3,247	6,482
Commercial lending | Commercial and industrial (“C&I”) | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	2,391	2,873
Commercial lending | CRE
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	15,895	23,244
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	14,373,385	13,857,870
Commercial lending | CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	14,342,301	13,820,441
Commercial lending | CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	15,189	14,185
Commercial lending | CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	15,189	14,185
Commercial lending | CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	0	0
Commercial lending | Real estate loan | Multifamily residential
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	4,703	169
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	4,764,180	4,573,068
Commercial lending | Real estate loan | Current Accruing Loans | Multifamily residential
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	4,758,515	4,571,899
Commercial lending | Real estate loan | Total Accruing Past Due Loans | Multifamily residential
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	962	1,000
Commercial lending | Real estate loan | Accruing Loans 30-59 Days Past Due | Multifamily residential
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	962	678
Commercial lending | Real estate loan | Accruing Loans 60-89 Days Past Due | Multifamily residential
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	0	322
Commercial lending | Construction and land
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	0	0
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	781,068	638,420
Commercial lending | Construction and land | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	759,516	638,420
Commercial lending | Construction and land | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	21,552	0
Commercial lending | Construction and land | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	21,552	0
Commercial lending | Construction and land | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	0	0
Commercial lending | Total CRE
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	20,598	23,413
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	19,918,633	19,069,358
Commercial lending | Total CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	19,860,332	19,030,760
Commercial lending | Total CRE | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	37,703	15,185
Commercial lending | Total CRE | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	37,703	14,863
Commercial lending | Total CRE | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	0	322
Consumer lending
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	33,056	25,685
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	14,239,647	13,421,977
Consumer lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	14,161,843	13,358,661
Consumer lending | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	44,748	37,631
Consumer lending | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	32,365	21,332
Consumer lending | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	12,383	16,299
Consumer lending | Real estate loan | Single-family residential
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	21,981	14,240
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	12,308,613	11,223,027
Consumer lending | Real estate loan | Current Accruing Loans | Single-family residential
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	12,254,680	11,183,134
Consumer lending | Real estate loan | Total Accruing Past Due Loans | Single-family residential
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	31,952	25,653
Consumer lending | Real estate loan | Accruing Loans 30-59 Days Past Due | Single-family residential
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	21,752	13,523
Consumer lending | Real estate loan | Accruing Loans 60-89 Days Past Due | Single-family residential
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	10,200	12,130
Consumer lending | HELOCs
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	11,051	11,346
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	1,862,928	2,122,655
Consumer lending | HELOCs | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	1,840,064	2,102,523
Consumer lending | HELOCs | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	11,813	8,786
Consumer lending | HELOCs | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	10,471	7,700
Consumer lending | HELOCs | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	1,342	1,086
Consumer lending | Total residential mortgage
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	33,032	25,586
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	14,171,541	13,345,682
Consumer lending | Total residential mortgage | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	14,094,744	13,285,657
Consumer lending | Total residential mortgage | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	43,765	34,439
Consumer lending | Total residential mortgage | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	32,223	21,223
Consumer lending | Total residential mortgage | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	11,542	13,216
Consumer lending | Other consumer
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	24	99
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	68,106	76,295
Consumer lending | Other consumer | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	67,099	73,004
Consumer lending | Other consumer | Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	983	3,192
Consumer lending | Other consumer | Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	142	109
Consumer lending | Other consumer | Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	$ 841	$ 3,083