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Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance $ 179,320 $ 176,797 $ 177,207 $ 172,808
Charge-offs (345) (6,126) (638) (6,354)
Recoveries 199 249 605 966
Provision & Transfers 22,403 6,500 24,403 10,000
Ending Allowance 201,577 177,420 201,577 177,420
Provision and transfers 22,403 6,500 24,403 10,000
Non-PCD | Luther Burbank        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Provision & Transfers 16,000      
Provision and transfers 16,000      
PCD | Luther Burbank        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Provision & Transfers 7,403      
Provision and transfers 7,403      
Unfunded commitments        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Provision & Transfers 1,000 3,000 1,000 4,000
Provision and transfers 1,000 3,000 1,000 4,000
Commercial loans        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance 139,155 138,282 137,194 133,476
Charge-offs (65) (6,054) (145) (6,136)
Recoveries 53 57 137 109
Provision & Transfers 10,270 5,380 12,227 10,216
Ending Allowance 149,413 137,665 149,413 137,665
Provision and transfers 10,270 5,380 12,227 10,216
Commercial loans | Multi-family        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance 13,791 12,324 13,155 12,013
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision & Transfers 8,188 714 8,824 1,025
Ending Allowance 21,979 13,038 21,979 13,038
Provision and transfers 8,188 714 8,824 1,025
Commercial loans | Commercial real estate        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance 29,007 27,380 28,842 25,814
Charge-offs 0 0 0 0
Recoveries 0 1 2 5
Provision & Transfers 3,984 422 4,147 1,984
Ending Allowance 32,991 27,803 32,991 27,803
Provision and transfers 3,984 422 4,147 1,984
Commercial loans | Commercial & industrial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance 60,836 63,873 58,773 57,210
Charge-offs (65) (6,054) (127) (6,136)
Recoveries 32 42 64 74
Provision & Transfers (1,542) 5,440 551 12,153
Ending Allowance 59,261 63,301 59,261 63,301
Provision and transfers (1,542) 5,440 551 12,153
Commercial loans | Construction        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance 28,863 26,133 29,408 26,161
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision & Transfers (1,546) (106) (2,091) (134)
Ending Allowance 27,317 26,027 27,317 26,027
Provision and transfers (1,546) (106) (2,091) (134)
Commercial loans | Land - acquisition & development        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance 6,658 8,572 7,016 12,278
Charge-offs 0 0 (18) 0
Recoveries 21 14 71 30
Provision & Transfers 1,186 (1,090) 796 (4,812)
Ending Allowance 7,865 7,496 7,865 7,496
Provision and transfers 1,186 (1,090) 796 (4,812)
Consumer loans        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance 40,165 38,515 40,013 39,332
Charge-offs (280) (72) (493) (218)
Recoveries 146 192 468 857
Provision & Transfers 12,133 1,120 12,176 (216)
Ending Allowance 52,164 39,755 52,164 39,755
Provision and transfers 12,133 1,120 12,176 (216)
Consumer loans | Construction        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance 2,262 3,500 2,781 3,410
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision & Transfers (344) (44) (863) 46
Ending Allowance 1,918 3,456 1,918 3,456
Provision and transfers (344) (44) (863) 46
Consumer loans | Single-family residential        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance 28,556 25,475 28,029 25,518
Charge-offs (131) (34) (131) (34)
Recoveries 55 104 175 534
Provision & Transfers 12,574 1,371 12,981 898
Ending Allowance 41,054 26,916 41,054 26,916
Provision and transfers 12,574 1,371 12,981 898
Consumer loans | Land - consumer lot loans        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance 3,345 4,142 3,512 5,047
Charge-offs 0 0 0 0
Recoveries 46 5 55 5
Provision & Transfers (177) (202) (353) (1,107)
Ending Allowance 3,214 3,945 3,214 3,945
Provision and transfers (177) (202) (353) (1,107)
Consumer loans | HELOC        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance 2,973 2,588 2,859 2,482
Charge-offs 0 0 0 0
Recoveries 1 0 2 1
Provision & Transfers 0 74 113 179
Ending Allowance 2,974 2,662 2,974 2,662
Provision and transfers 0 74 113 179
Consumer loans | Consumer        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Allowance 3,029 2,810 2,832 2,875
Charge-offs (149) (38) (362) (184)
Recoveries 44 83 236 317
Provision & Transfers 80 (79) 298 (232)
Ending Allowance 3,004 2,776 3,004 2,776
Provision and transfers $ 80 $ (79) $ 298 $ (232)