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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 19,648,504 $ 19,384,959  
Ratio of loan type to all loans 100.00% 100.00%  
Allowance for loan losses $ 177,207 $ 172,808 $ 171,300
Loans in process 1,895,940 3,006,023  
Net deferred fees, costs and discounts 98,807 92,564  
Total loan contra accounts 2,171,954 3,271,395  
Net loans 17,476,550 16,113,564  
Commercial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 12,094,294 $ 12,206,134  
Ratio of loan type to all loans 61.60% 63.00%  
Allowance for loan losses $ 137,194 $ 133,476 125,375
Commercial loans | Multi-family      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 2,907,086 $ 2,645,801  
Ratio of loan type to all loans 14.80% 13.70%  
Allowance for loan losses $ 13,155 $ 12,013 16,949
Commercial loans | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 3,344,959 $ 3,133,660  
Ratio of loan type to all loans 17.00% 16.20%  
Allowance for loan losses $ 28,842 $ 25,814 23,437
Commercial loans | Commercial & industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 2,321,717 $ 2,350,984  
Ratio of loan type to all loans 11.80% 12.10%  
Allowance for loan losses $ 58,773 $ 57,210 45,957
Commercial loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 3,318,994 $ 3,784,388  
Ratio of loan type to all loans 16.90% 19.50%  
Allowance for loan losses $ 29,408 $ 26,161 25,585
Commercial loans | Land - acquisition & development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 201,538 $ 291,301  
Ratio of loan type to all loans 1.10% 1.50%  
Allowance for loan losses $ 7,016 $ 12,278 13,447
Consumer loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 7,554,210 $ 7,178,825  
Ratio of loan type to all loans 38.40% 37.00%  
Allowance for loan losses $ 40,013 $ 39,332 45,925
Consumer loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 672,643 $ 974,652  
Ratio of loan type to all loans 3.40% 5.00%  
Allowance for loan losses $ 2,781 $ 3,410 4,907
Consumer loans | Single-family residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 6,451,270 $ 5,771,862  
Ratio of loan type to all loans 32.80% 29.80%  
Allowance for loan losses $ 28,029 $ 25,518 30,978
Consumer loans | Land - consumer lot loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 125,723 $ 153,240  
Ratio of loan type to all loans 0.60% 0.80%  
Allowance for loan losses $ 3,512 $ 5,047 4,939
Consumer loans | HELOC      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 234,410 $ 203,528  
Ratio of loan type to all loans 1.20% 1.00%  
Allowance for loan losses $ 2,859 $ 2,482 2,390
Consumer loans | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 70,164 $ 75,543  
Ratio of loan type to all loans 0.40% 0.40%  
Allowance for loan losses $ 2,832 $ 2,875 $ 2,711