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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 17,775,453 $ 16,299,332
Ratio of loan type to all loans 100.00% 100.00%
Allowance for credit losses on loans $ 171,384 $ 171,300
Loans in process 2,440,430 2,232,836
Net deferred fees, costs and discounts 68,713 61,626
Total loan contra accounts 2,680,527 2,465,762
Net loans 15,094,926 13,833,570
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 11,099,750 $ 10,160,647
Ratio of loan type to all loans 62.40% 62.30%
Commercial loans | Multi-family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 2,392,810 $ 2,291,477
Ratio of loan type to all loans 13.50% 14.00%
Commercial loans | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 2,829,946 $ 2,443,845
Ratio of loan type to all loans 15.90% 15.00%
Commercial loans | Commercial & industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 2,504,442 $ 2,314,654
Ratio of loan type to all loans 14.10% 14.20%
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 111,000 $ 312,000
Commercial loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 3,136,239 $ 2,888,214
Ratio of loan type to all loans 17.60% 17.70%
Commercial loans | Land - acquisition & development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 236,313 $ 222,457
Ratio of loan type to all loans 1.30% 1.40%
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 6,675,703 $ 6,138,685
Ratio of loan type to all loans 37.60% 37.70%
Consumer loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 836,314 $ 783,221
Ratio of loan type to all loans 4.70% 4.80%
Consumer loans | Single-family residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 5,442,535 $ 4,951,627
Ratio of loan type to all loans 30.60% 30.40%
Consumer loans | Land - consumer lot loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 154,976 $ 149,956
Ratio of loan type to all loans 0.90% 0.90%
Consumer loans | HELOC    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 174,367 $ 165,989
Ratio of loan type to all loans 1.00% 1.00%
Consumer loans | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 67,511 $ 87,892
Ratio of loan type to all loans 0.40% 0.50%