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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 20,182,431,000   $ 19,384,959,000      
Ratio of loan type to all loans 100.00%   100.00%      
Allowance for credit losses on loans $ 177,420,000 $ 176,797,000 $ 172,808,000 $ 171,384,000 $ 171,411,000 $ 171,300,000
Loans in process 2,648,512,000   3,006,023,000      
Net deferred fees, costs and discounts 84,593,000   92,564,000      
Total loan contra accounts 2,910,525,000   3,271,395,000      
Net loans 17,271,906,000   16,113,564,000      
Commercial loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 12,736,229,000   $ 12,206,134,000      
Ratio of loan type to all loans 63.10%   63.00%      
Allowance for credit losses on loans $ 137,665,000 138,282,000 $ 133,476,000 129,440,000 127,837,000 125,375,000
Commercial loans | Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 2,894,567,000   $ 2,645,801,000      
Ratio of loan type to all loans 14.30%   13.70%      
Allowance for credit losses on loans $ 13,038,000 12,324,000 $ 12,013,000 14,463,000 15,993,000 16,949,000
Commercial loans | Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 3,283,151,000   $ 3,133,660,000      
Ratio of loan type to all loans 16.30%   16.20%      
Allowance for credit losses on loans $ 27,803,000 27,380,000 $ 25,814,000 24,682,000 25,722,000 23,437,000
Commercial loans | Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 2,590,700,000   $ 2,350,984,000      
Ratio of loan type to all loans 12.80%   12.10%      
Allowance for credit losses on loans $ 63,301,000 63,873,000 $ 57,210,000 53,903,000 47,231,000 45,957,000
Commercial loans | Commercial & industrial | SBA Payroll Protection Program, CARES Act            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses on loans 0   0      
Net loans 2,781,000   10,141,399      
Commercial loans | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 3,735,821,000   $ 3,784,388,000      
Ratio of loan type to all loans 18.50%   19.50%      
Allowance for credit losses on loans $ 26,027,000 26,133,000 $ 26,161,000 22,707,000 24,766,000 25,585,000
Commercial loans | Land - acquisition & development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 231,990,000   $ 291,301,000      
Ratio of loan type to all loans 1.10%   1.50%      
Allowance for credit losses on loans $ 7,496,000 8,572,000 $ 12,278,000 13,685,000 14,125,000 13,447,000
Consumer loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 7,446,202,000   $ 7,178,825,000      
Ratio of loan type to all loans 36.90%   37.00%      
Allowance for credit losses on loans $ 39,755,000 38,515,000 $ 39,332,000 41,944,000 43,574,000 45,925,000
Consumer loans | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 840,475,000   $ 974,652,000      
Ratio of loan type to all loans 4.20%   5.00%      
Allowance for credit losses on loans $ 3,456,000 3,500,000 $ 3,410,000 3,129,000 3,719,000 4,907,000
Consumer loans | Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 6,175,250,000   $ 5,771,862,000      
Ratio of loan type to all loans 30.60%   29.80%      
Allowance for credit losses on loans $ 26,916,000 25,475,000 $ 25,518,000 28,992,000 30,106,000 30,978,000
Consumer loans | Land - consumer lot loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 141,215,000   $ 153,240,000      
Ratio of loan type to all loans 0.70%   0.80%      
Allowance for credit losses on loans $ 3,945,000 4,142,000 $ 5,047,000 5,105,000 4,984,000 4,939,000
Consumer loans | HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 218,179,000   $ 203,528,000      
Ratio of loan type to all loans 1.10%   1.00%      
Allowance for credit losses on loans $ 2,662,000 2,588,000 $ 2,482,000 2,475,000 2,365,000 2,390,000
Consumer loans | Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 71,083,000   $ 75,543,000      
Ratio of loan type to all loans 0.40%   0.40%      
Allowance for credit losses on loans $ 2,776,000 $ 2,810,000 $ 2,875,000 $ 2,243,000 $ 2,400,000 $ 2,711,000