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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($)
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 19,384,959,000 $ 16,299,332,000  
Ratio of loan type to all loans 100.00% 100.00%  
Allowance for loan losses $ 172,808,000 $ 171,300,000 $ 166,955,000
Loans in process 3,006,023,000 2,232,836,000  
Net deferred fees, costs and discounts 92,564,000 61,626,000  
Total loan contra accounts 3,271,395,000 2,465,762,000  
Net loans 16,113,564,000 13,833,570,000  
Commercial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 12,206,134,000 $ 10,160,647,000  
Ratio of loan type to all loans 63.00% 62.30%  
Allowance for loan losses $ 133,476,000 $ 125,375,000 109,923,000
Commercial loans | Multi-family      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 2,645,801,000 $ 2,291,477,000  
Ratio of loan type to all loans 13.70% 14.00%  
Allowance for loan losses $ 12,013,000 $ 16,949,000 13,853,000
Commercial loans | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 3,133,660,000 $ 2,443,845,000  
Ratio of loan type to all loans 16.20% 15.00%  
Allowance for loan losses $ 25,814,000 $ 23,437,000 22,516,000
Commercial loans | Commercial & industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 2,350,984,000 $ 2,314,654,000  
Ratio of loan type to all loans 12.10% 14.20%  
Allowance for loan losses $ 57,210,000 $ 45,957,000 38,665,000
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans 10,237,000 311,795,000  
Allowance for loan losses 0    
Commercial loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 3,784,388,000 $ 2,888,214,000  
Ratio of loan type to all loans 19.50% 17.70%  
Allowance for loan losses $ 26,161,000 $ 25,585,000 24,156,000
Commercial loans | Land - acquisition & development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 291,301,000 $ 222,457,000  
Ratio of loan type to all loans 1.50% 1.40%  
Allowance for loan losses $ 12,278,000 $ 13,447,000 10,733,000
Consumer loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 7,178,825,000 $ 6,138,685,000  
Ratio of loan type to all loans 37.00% 37.70%  
Allowance for loan losses $ 39,332,000 $ 45,925,000 57,032,000
Consumer loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 974,652,000 $ 783,221,000  
Ratio of loan type to all loans 5.00% 4.80%  
Allowance for loan losses $ 3,410,000 $ 4,907,000 3,555,000
Consumer loans | Single-family residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 5,771,862,000 $ 4,951,627,000  
Ratio of loan type to all loans 29.80% 30.40%  
Allowance for loan losses $ 25,518,000 $ 30,978,000 45,186,000
Consumer loans | Land - consumer lot loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 153,240,000 $ 149,956,000  
Ratio of loan type to all loans 0.80% 0.90%  
Allowance for loan losses $ 5,047,000 $ 4,939,000 2,729,000
Consumer loans | HELOC      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 203,528,000 $ 165,989,000  
Ratio of loan type to all loans 1.00% 1.00%  
Allowance for loan losses $ 2,482,000 $ 2,390,000 2,571,000
Consumer loans | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross loans $ 75,543,000 $ 87,892,000  
Ratio of loan type to all loans 0.40% 0.50%  
Allowance for loan losses $ 2,875,000 $ 2,711,000 $ 2,991,000