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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 19,927,844   $ 19,384,959      
Ratio of loan type to all loans 100.00%   100.00%      
Allowance for credit losses on loans $ 178,069 $ 177,420 $ 172,808 $ 170,979 $ 171,384 $ 171,300
Loans in process 2,270,038   3,006,023      
Net deferred fees, costs and discounts 95,549   92,564      
Total loan contra accounts 2,543,656   3,271,395      
Net loans 17,384,188   16,113,564      
Commercial loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 12,420,415   $ 12,206,134      
Ratio of loan type to all loans 62.30%   63.00%      
Allowance for credit losses on loans $ 138,185 137,665 $ 133,476 130,859 129,440 125,375
Commercial loans | Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 2,889,635   $ 2,645,801      
Ratio of loan type to all loans 14.50%   13.70%      
Allowance for credit losses on loans $ 12,976 13,038 $ 12,013 12,574 14,463 16,949
Commercial loans | Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 3,239,387   $ 3,133,660      
Ratio of loan type to all loans 16.30%   16.20%      
Allowance for credit losses on loans $ 28,132 27,803 $ 25,814 25,300 24,682 23,437
Commercial loans | Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 2,496,778   $ 2,350,984      
Ratio of loan type to all loans 12.50%   12.10%      
Allowance for credit losses on loans $ 61,915 63,301 $ 57,210 54,924 53,903 45,957
Commercial loans | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 3,578,430   $ 3,784,388      
Ratio of loan type to all loans 18.00%   19.50%      
Allowance for credit losses on loans $ 27,916 26,027 $ 26,161 25,834 22,707 25,585
Commercial loans | Land - acquisition & development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 216,185   $ 291,301      
Ratio of loan type to all loans 1.10%   1.50%      
Allowance for credit losses on loans $ 7,246 7,496 $ 12,278 12,227 13,685 13,447
Consumer loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 7,507,429   $ 7,178,825      
Ratio of loan type to all loans 37.70%   37.00%      
Allowance for credit losses on loans $ 39,884 39,755 $ 39,332 40,120 41,944 45,925
Consumer loans | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 757,171   $ 974,652      
Ratio of loan type to all loans 3.80%   5.00%      
Allowance for credit losses on loans $ 3,221 3,456 $ 3,410 3,354 3,129 4,907
Consumer loans | Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 6,313,561   $ 5,771,862      
Ratio of loan type to all loans 31.70%   29.80%      
Allowance for credit losses on loans $ 27,083 26,916 $ 25,518 26,217 28,992 30,978
Consumer loans | Land - consumer lot loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 134,967   $ 153,240      
Ratio of loan type to all loans 0.70%   0.80%      
Allowance for credit losses on loans $ 3,770 3,945 $ 5,047 5,220 5,105 4,939
Consumer loans | HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 224,917   $ 203,528      
Ratio of loan type to all loans 1.10%   1.00%      
Allowance for credit losses on loans $ 2,743 2,662 $ 2,482 2,632 2,475 2,390
Consumer loans | Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 76,813   $ 75,543      
Ratio of loan type to all loans 0.40%   0.40%      
Allowance for credit losses on loans $ 3,067 $ 2,776 $ 2,875 $ 2,697 $ 2,243 $ 2,711