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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 19,353,053 $ 19,648,504    
Ratio of loan type to all loans 100.00% 100.00%    
Allowance for credit losses on loans $ 179,320 $ 177,207 $ 176,797 $ 172,808
Loans in process 1,516,522 1,895,940    
Net deferred fees, costs and discounts 72,589 98,807    
Total loan contra accounts 1,768,431 2,171,954    
Net loans 17,584,622 17,476,550    
Commercial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 11,835,871 $ 12,094,294    
Ratio of loan type to all loans 61.20% 61.60%    
Allowance for credit losses on loans $ 139,155 $ 137,194 138,282 133,476
Commercial loans | Multi-family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 3,054,426 $ 2,907,086    
Ratio of loan type to all loans 15.80% 14.80%    
Allowance for credit losses on loans $ 13,791 $ 13,155 12,324 12,013
Commercial loans | Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 3,351,113 $ 3,344,959    
Ratio of loan type to all loans 17.30% 17.00%    
Allowance for credit losses on loans $ 29,007 $ 28,842 27,380 25,814
Commercial loans | Commercial & industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 2,371,393 $ 2,321,717    
Ratio of loan type to all loans 12.30% 11.80%    
Allowance for credit losses on loans $ 60,836 $ 58,773 63,873 57,210
Commercial loans | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 2,868,207 $ 3,318,994    
Ratio of loan type to all loans 14.80% 16.90%    
Allowance for credit losses on loans $ 28,863 $ 29,408 26,133 26,161
Commercial loans | Land - acquisition & development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 190,732 $ 201,538    
Ratio of loan type to all loans 1.00% 1.00%    
Allowance for credit losses on loans $ 6,658 $ 7,016 8,572 12,278
Consumer loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 7,517,182 $ 7,554,210    
Ratio of loan type to all loans 38.80% 38.40%    
Allowance for credit losses on loans $ 40,165 $ 40,013 38,515 39,332
Consumer loans | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 543,748 $ 672,643    
Ratio of loan type to all loans 2.80% 3.40%    
Allowance for credit losses on loans $ 2,262 $ 2,781 3,500 3,410
Consumer loans | Single-family residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 6,535,073 $ 6,451,270    
Ratio of loan type to all loans 33.80% 32.80%    
Allowance for credit losses on loans $ 28,556 $ 28,029 25,475 25,518
Consumer loans | Land - consumer lot loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 119,735 $ 125,723    
Ratio of loan type to all loans 0.60% 0.60%    
Allowance for credit losses on loans $ 3,345 $ 3,512 4,142 5,047
Consumer loans | HELOC        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 243,742 $ 234,410    
Ratio of loan type to all loans 1.20% 1.20%    
Allowance for credit losses on loans $ 2,973 $ 2,859 2,588 2,482
Consumer loans | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross loans $ 74,884 $ 70,164    
Ratio of loan type to all loans 0.40% 0.40%    
Allowance for credit losses on loans $ 3,029 $ 2,832 $ 2,810 $ 2,875