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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($)
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 16,299,332,000 $ 14,467,722,000  
Ratio of loan type to all loans 100.00% 100.00%  
Allowance for loan losses $ 171,300,000 $ 166,955,000 $ 131,534,000
Loans in process 2,232,836,000 1,456,072,000  
Net deferred fees, costs and discounts 61,626,000 52,378,000  
Total loan contra accounts 2,465,762,000 1,675,405,000  
Net loans 13,833,570,000 12,792,317,000  
Commercial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 10,160,647,000 $ 8,163,029,000  
Ratio of loan type to all loans 62.30% 56.30%  
Allowance for loan losses $ 125,375,000 $ 109,923,000 93,470,000
Commercial loans | Multi-family      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 2,291,477,000 $ 1,538,762,000  
Ratio of loan type to all loans 14.00% 10.60%  
Allowance for loan losses $ 16,949,000 $ 13,853,000 7,391,000
Commercial loans | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 2,443,845,000 $ 1,895,086,000  
Ratio of loan type to all loans 15.00% 13.10%  
Allowance for loan losses $ 23,437,000 $ 22,516,000 13,170,000
Commercial loans | Commercial & industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 2,314,654,000 $ 2,132,160,000  
Ratio of loan type to all loans 14.20% 14.70%  
Allowance for loan losses $ 45,957,000 $ 38,665,000 31,450,000
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 311,795,000 762,004,000  
Allowance for loan losses 0    
Net loans 305,162,000    
Commercial loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 2,888,214,000 $ 2,403,276,000  
Ratio of loan type to all loans 17.70% 16.60%  
Allowance for loan losses $ 25,585,000 $ 24,156,000 32,304,000
Commercial loans | Land - acquisition & development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 222,457,000 $ 193,745,000  
Ratio of loan type to all loans 1.40% 1.30%  
Allowance for loan losses $ 13,447,000 $ 10,733,000 9,155,000
Consumer loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 6,138,685,000 $ 6,304,693,000  
Ratio of loan type to all loans 37.70% 43.70%  
Allowance for loan losses $ 45,925,000 $ 57,032,000 38,064,000
Consumer loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 783,221,000 $ 674,879,000  
Ratio of loan type to all loans 4.80% 4.70%  
Allowance for loan losses $ 4,907,000 $ 3,555,000 1,369,000
Consumer loans | Single-family residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 4,951,627,000 $ 5,304,689,000  
Ratio of loan type to all loans 30.40% 36.70%  
Allowance for loan losses $ 30,978,000 $ 45,186,000 30,988,000
Consumer loans | Land - consumer lot loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 149,956,000 $ 102,263,000  
Ratio of loan type to all loans 0.90% 0.70%  
Allowance for loan losses $ 4,939,000 $ 2,729,000 2,143,000
Consumer loans | HELOC      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 165,989,000 $ 139,703,000  
Ratio of loan type to all loans 1.00% 1.00%  
Allowance for loan losses $ 2,390,000 $ 2,571,000 1,103,000
Consumer loans | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 87,892,000 $ 83,159,000  
Ratio of loan type to all loans 0.50% 0.60%  
Allowance for loan losses $ 2,711,000 $ 2,991,000 $ 2,461,000