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Loans Receivable and Allowance for Credit Losses - Aging Analysis on Loans Held-for-Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | $ 50,907,184 | $ 48,202,430
Total Nonaccrual Loans | 103,700 | 99,526
Current Accruing Loans |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 50,709,575 | 48,040,733
Total Accruing Past Due Loans |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 93,909 | 62,171
Accruing Loans 30-59 Days Past Due |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 70,959 | 42,677
Accruing Loans 60-89 Days Past Due |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 22,950 | 19,494
Commercial lending |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 36,229,707 | 34,780,453
Total Nonaccrual Loans | 65,578 | 73,841
Commercial lending | Current Accruing Loans |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 36,127,081 | 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 | 37,048 | 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 | 36,293 | 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 | 755 | 3,195
Commercial lending | Commercial and industrial (“C&I”) |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 15,864,042 | 15,711,095
Total Nonaccrual Loans | 49,147 | 50,428
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 | 15,781,468 | 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 | 33,427 | 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 | 33,195 | 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 | 232 | 2,873
Commercial lending | CRE |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 14,667,378 | 13,857,870
Total Nonaccrual Loans | 610 | 23,244
Commercial lending | CRE | Current Accruing Loans |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 14,664,230 | 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 | 2,538 | 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 | 2,015 | 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 | 523 | 0
Commercial lending | Real estate loan | Multifamily residential |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 4,900,097 | 4,573,068
Total Nonaccrual Loans | 4,680 | 169
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 | 4,894,334 | 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 | 1,083 | 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 | 1,083 | 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 |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 798,190 | 638,420
Total Nonaccrual Loans | 11,141 | 0
Commercial lending | Construction and land | Current Accruing Loans |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 787,049 | 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 | 0 | 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 | 0 | 0
Commercial lending | Total CRE |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 20,365,665 | 19,069,358
Total Nonaccrual Loans | 16,431 | 23,413
Commercial lending | Total CRE | Current Accruing Loans |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 20,345,613 | 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 | 3,621 | 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 | 3,098 | 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 | 523 | 322
Consumer lending |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 14,677,477 | 13,421,977
Total Nonaccrual Loans | 38,122 | 25,685
Consumer lending | Current Accruing Loans |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 14,582,494 | 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 | 56,861 | 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 | 34,666 | 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 | 22,195 | 16,299
Consumer lending | Real estate loan | Single-family residential |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 12,836,558 | 11,223,027
Total Nonaccrual Loans | 24,784 | 14,240
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 | 12,771,661 | 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 | 40,113 | 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 | 24,141 | 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 | 15,972 | 12,130
Consumer lending | HELOCs |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 1,776,665 | 2,122,655
Total Nonaccrual Loans | 13,202 | 11,346
Consumer lending | HELOCs | Current Accruing Loans |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 1,746,841 | 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 | 16,622 | 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 | 10,416 | 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 | 6,206 | 1,086
Consumer lending | Total residential mortgage |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 14,613,223 | 13,345,682
Total Nonaccrual Loans | 37,986 | 25,586
Consumer lending | Total residential mortgage | Current Accruing Loans |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 14,518,502 | 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 | 56,735 | 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 | 34,557 | 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 | 22,178 | 13,216
Consumer lending | Other consumer |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 64,254 | 76,295
Total Nonaccrual Loans | 136 | 99
Consumer lending | Other consumer | Current Accruing Loans |  |
Current, Past Due or Nonaccrual Loans |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 63,992 | 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 | 126 | 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 | 109 | 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 | $ 17 | $ 3,083

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