Loans Receivable and Allowance for Credit Losses - Aging Analysis on Loans Held-for-Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	$ 93,125	$ 99,526
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	48,918,048	48,202,430
Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	48,769,743	48,040,733
Total Accruing Past Due Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	55,180	62,171
Accruing Loans 30-59 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	29,991	42,677
Accruing Loans 60-89 Days Past Due
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	25,189	19,494
Commercial lending
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	63,174	73,841
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	35,074,650	34,780,453
Commercial lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	34,992,236	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	19,240	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	6,453	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	12,787	3,195
Commercial lending | Commercial and industrial (“C&I”)
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	43,747	50,428
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	15,641,840	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	15,589,505	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	8,588	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	4,758	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	3,830	2,873
Commercial lending | CRE
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	19,268	23,244
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	14,019,136	13,857,870
Commercial lending | CRE | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	13,998,080	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	1,788	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	1,304	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	484	0
Commercial lending | Real estate loan | Multifamily residential
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	159	169
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	4,682,280	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	4,681,411	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	710	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	391	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	319	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	731,394	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	723,240	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	8,154	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	0	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	8,154	0
Commercial lending | Total CRE
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	19,427	23,413
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	19,432,810	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	19,402,731	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	10,652	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	1,695	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	8,957	322
Consumer lending
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	29,951	25,685
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	13,843,398	13,421,977
Consumer lending | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	13,777,507	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	35,940	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	23,538	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	12,402	16,299
Consumer lending | Real estate loan | Single-family residential
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	20,540	14,240
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	11,786,998	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	11,740,953	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	25,505	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	17,964	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	7,541	12,130
Consumer lending | HELOCs
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	9,045	11,346
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	1,988,881	2,122,655
Consumer lending | HELOCs | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	1,969,546	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	10,290	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	5,485	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	4,805	1,086
Consumer lending | Total residential mortgage
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	29,585	25,586
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	13,775,879	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	13,710,499	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	35,795	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	23,449	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	12,346	13,216
Consumer lending | Other consumer
Current, Past Due or Nonaccrual Loans
Total Nonaccrual Loans	366	99
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	67,519	76,295
Consumer lending | Other consumer | Current Accruing Loans
Current, Past Due or Nonaccrual Loans
Financing Receivable, Excluding Accrued Interest, Modified, after 12 Months	67,008	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	145	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	89	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	$ 56	$ 3,083