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LOANS AND LEASES RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LEASES - Schedule of Allowance for Credit Losses (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 15, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance |  | $ 132,436 | $ 139,656 | $ 135,311 | $ 130,924 | $ 130,924
Allowance for credit losses on FDIC PCD loans, net of charge-offs |  |  |  |  | 2,576 |
Charge-offs |  | (21,224) | (30,020) | (66,775) | (69,713) | (95,066)
Recoveries |  | 4,180 | 12,522 | 13,052 | 18,000 |
Provision (benefit) for credit losses on loans and leases |  | 17,766 | 17,055 | 51,570 | 57,426 |
Ending balance |  | 133,158 | 139,213 | 133,158 | 139,213 | 135,311
Allowance for credit losses on FDIC PCD loans, excluding charge-offs | $ 8,700 |  |  |  |  |
Commercial and industrial, including specialized lending |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 23,721 | 29,092 | 23,503 | 17,582 | 17,582
Allowance for credit losses on FDIC PCD loans, net of charge-offs |  |  |  |  | 2,576 |
Charge-offs |  | (6,538) | (9,008) | (19,282) | (9,600) |
Recoveries |  | 1,482 | 6,034 | 4,889 | 6,439 |
Provision (benefit) for credit losses on loans and leases |  | 6,526 | (1,132) | 16,081 | 7,989 |
Ending balance |  | 25,191 | 24,986 | 25,191 | 24,986 | 23,503
Commercial and industrial, including specialized lending | Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Charge-offs |  | (6,538) |  | (19,282) |  | (16,915)
Multifamily |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 20,652 | 15,400 | 16,343 | 14,541 | 14,541
Allowance for credit losses on FDIC PCD loans, net of charge-offs |  |  |  |  | 0 |
Charge-offs |  | (2,167) | (1,999) | (4,073) | (3,447) |
Recoveries |  | 0 | 0 | 0 | 0 |
Provision (benefit) for credit losses on loans and leases |  | (395) | 2,469 | 5,820 | 4,776 |
Ending balance |  | 18,090 | 15,870 | 18,090 | 15,870 | 16,343
Multifamily | Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Charge-offs |  | (2,167) |  | (4,073) |  | (3,574)
Commercial real estate owner occupied |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 8,431 | 10,215 | 9,882 | 6,454 | 6,454
Allowance for credit losses on FDIC PCD loans, net of charge-offs |  |  |  |  | 0 |
Charge-offs |  | (4) | (39) | (26) | (39) |
Recoveries |  | 0 | 0 | 0 | 34 |
Provision (benefit) for credit losses on loans and leases |  | 2,486 | 187 | 1,057 | 3,914 |
Ending balance |  | 10,913 | 10,363 | 10,913 | 10,363 | 9,882
Commercial real estate owner occupied | Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Charge-offs |  | (4) |  | (26) |  | (39)
Commercial real estate non-owner occupied |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 17,966 | 13,495 | 16,859 | 11,219 | 11,219
Allowance for credit losses on FDIC PCD loans, net of charge-offs |  |  |  |  | 0 |
Charge-offs |  | 0 | 0 | 0 | (4,527) |
Recoveries |  | 0 | 0 | 0 | 27 |
Provision (benefit) for credit losses on loans and leases |  | (663) | 2,324 | 444 | 9,100 |
Ending balance |  | 17,303 | 15,819 | 17,303 | 15,819 | 16,859
Commercial real estate non-owner occupied | Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Charge-offs |  | 0 |  | 0 |  | (4,527)
Construction |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 1,856 | 2,639 | 1,482 | 1,913 | 1,913
Allowance for credit losses on FDIC PCD loans, net of charge-offs |  |  |  |  | 0 |
Charge-offs |  | 0 | 0 | 0 | 0 |
Recoveries |  | 3 | 0 | 10 | 116 |
Provision (benefit) for credit losses on loans and leases |  | (253) | 491 | 114 | 1,101 |
Ending balance |  | 1,606 | 3,130 | 1,606 | 3,130 | 1,482
Construction | Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Charge-offs |  | 0 |  | 0 |  | 0
Residential real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 5,884 | 6,846 | 6,586 | 6,094 | 6,094
Allowance for credit losses on FDIC PCD loans, net of charge-offs |  |  |  |  | 0 |
Charge-offs |  | (19) | (42) | (38) | (69) |
Recoveries |  | 40 | 29 | 61 | 34 |
Provision (benefit) for credit losses on loans and leases |  | (68) | (31) | (772) | 743 |
Ending balance |  | 5,837 | 6,802 | 5,837 | 6,802 | 6,586
Manufactured housing |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 4,094 | 4,338 | 4,239 | 4,430 | 4,430
Allowance for credit losses on FDIC PCD loans, net of charge-offs |  |  |  |  | 0 |
Charge-offs |  | 0 | 0 | 0 | 0 |
Recoveries |  | 0 | 0 | 0 | 0 |
Provision (benefit) for credit losses on loans and leases |  | (13) | (258) | (158) | (350) |
Ending balance |  | 4,081 | 4,080 | 4,081 | 4,080 | 4,239
Installment |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 49,832 | 57,631 | 56,417 | 68,691 | 68,691
Allowance for credit losses on FDIC PCD loans, net of charge-offs |  |  |  |  | 0 |
Charge-offs |  | (12,496) | (18,932) | (43,356) | (52,031) |
Recoveries |  | 2,655 | 6,459 | 8,092 | 11,350 |
Provision (benefit) for credit losses on loans and leases |  | 10,146 | 13,005 | 28,984 | 30,153 |
Ending balance |  | $ 50,137 | $ 58,163 | $ 50,137 | $ 58,163 | $ 56,417
Special Lending | Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Charge-off of certain PCD loans | $ 6,200 |  |  |  |  |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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