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Loans Receivable and Allowance for Credit Losses - Allowance for Credit Losses Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
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Jun. 30, 2024 USD ($) qtr | Jun. 30, 2023 USD ($) qtr | Jun. 30, 2024 USD ($) qtr | Jun. 30, 2023 USD ($) qtr | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 qtr | Mar. 31, 2023 USD ($) | Jan. 01, 2023 USD ($) | Dec. 31, 2022 USD ($)
Financing Receivable Allowance for Credit Losses |  |  |  |  |  |  |  |  |  |
Life time loss rate, period span | qtr | 8 |  | 8 |  |  |  |  |  |  |
Allowance for credit losses | $ 723,000 |  | $ 723,000 |  |  | $ 706,000 |  |  |  |
Increase in allowance for credit losses |  |  | 17,000 |  |  |  |  |  |  |
Allowance for loan losses | 683,794 | $ 635,400 | 683,794 | $ 635,400 | $ 670,280 | 668,743 |  | $ 619,893 | $ 601,673 | $ 595,645
Provision for (reversal of) credit losses on loans | 36,762 | 24,025 | 60,916 | 42,545 |  |  |  |  |  |
Gross charge-offs | (25,322) | (9,755) | (50,006) | (11,792) |  |  |  |  |  |
Gross recoveries | 2,187 | 2,218 | 4,294 | 3,646 |  |  |  |  |  |
Net charge-offs | (23,135) | (7,537) | (45,712) | (8,146) |  |  |  |  |  |
Foreign currency translation adjustment | (113) | $ (981) | (153) | $ (672) |  |  |  |  |  |
C&I |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |  |  |  |  |  |
Life time loss rate, period span | qtr |  | 11 |  | 11 |  |  | 8 |  |  |
C&I | Commercial lending |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |  |  |  |  |  |
Allowance for loan losses | 379,984 | $ 375,333 | 379,984 | $ 375,333 | 373,631 | 392,685 |  | 376,325 | 377,383 | 371,700
Provision for (reversal of) credit losses on loans | 17,783 | 5,259 | 18,057 | 4,581 |  |  |  |  |  |
Gross charge-offs | (13,134) | (7,335) | (34,132) | (9,235) |  |  |  |  |  |
Gross recoveries | 1,817 | 2,065 | 3,527 | 3,276 |  |  |  |  |  |
Net charge-offs | (11,317) | (5,270) | (30,605) | (5,959) |  |  |  |  |  |
Foreign currency translation adjustment | (113) | (981) | (153) | (672) |  |  |  |  |  |
Multifamily residential | Commercial lending |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |  |  |  |  |  |
Allowance for loan losses | 40,254 | 22,938 | 40,254 | 22,938 | $ 37,418 | $ 34,375 |  | $ 24,526 | $ 23,379 | $ 23,373
Provision for (reversal of) credit losses on loans | 2,628 | (1,604) | 5,660 | (469) |  |  |  |  |  |
Gross charge-offs | 0 | 0 | (6) | 0 |  |  |  |  |  |
Gross recoveries | 208 | 16 | 225 | 28 |  |  |  |  |  |
Net charge-offs | 208 | 16 | 219 | 28 |  |  |  |  |  |
Foreign currency translation adjustment | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |

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