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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 22,598,153   $ 19,648,504      
Ratio of loan type to all loans 100.00%   100.00%      
Allowance for credit losses on loans $ 201,577 $ 179,320 $ 177,207 $ 177,420 $ 176,797 $ 172,808
Loans in process 1,303,978   1,895,940      
Net deferred fees, costs and discounts 297,339   98,807      
Total loan contra accounts 1,802,894   2,171,954      
Net loans 20,795,259   17,476,550      
Commercial loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 12,882,231   $ 12,094,294      
Ratio of loan type to all loans 57.00%   61.60%      
Allowance for credit losses on loans $ 149,413 139,155 $ 137,194 137,665 138,282 133,476
Commercial loans | Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 4,173,375   $ 2,907,086      
Ratio of loan type to all loans 18.50%   14.80%      
Allowance for credit losses on loans $ 21,979 13,791 $ 13,155 13,038 12,324 12,013
Commercial loans | Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 3,570,790   $ 3,344,959      
Ratio of loan type to all loans 15.80%   17.00%      
Allowance for credit losses on loans $ 32,991 29,007 $ 28,842 27,803 27,380 25,814
Commercial loans | Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 2,290,452   $ 2,321,717      
Ratio of loan type to all loans 10.10%   11.80%      
Allowance for credit losses on loans $ 59,261 60,836 $ 58,773 63,301 63,873 57,210
Commercial loans | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 2,631,783   $ 3,318,994      
Ratio of loan type to all loans 11.60%   16.90%      
Allowance for credit losses on loans $ 27,317 28,863 $ 29,408 26,027 26,133 26,161
Commercial loans | Land - acquisition & development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 215,831   $ 201,538      
Ratio of loan type to all loans 1.00%   1.00%      
Allowance for credit losses on loans $ 7,865 6,658 $ 7,016 7,496 8,572 12,278
Consumer loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 9,715,922   $ 7,554,210      
Ratio of loan type to all loans 43.00%   38.40%      
Allowance for credit losses on loans $ 52,164 40,165 $ 40,013 39,755 38,515 39,332
Consumer loans | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 466,740   $ 672,643      
Ratio of loan type to all loans 2.10%   3.40%      
Allowance for credit losses on loans $ 1,918 2,262 $ 2,781 3,456 3,500 3,410
Consumer loans | Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 8,816,039   $ 6,451,270      
Ratio of loan type to all loans 39.00%   32.80%      
Allowance for credit losses on loans $ 41,054 28,556 $ 28,029 26,916 25,475 25,518
Consumer loans | Land - consumer lot loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 115,022   $ 125,723      
Ratio of loan type to all loans 0.50%   0.60%      
Allowance for credit losses on loans $ 3,214 3,345 $ 3,512 3,945 4,142 5,047
Consumer loans | HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 243,852   $ 234,410      
Ratio of loan type to all loans 1.10%   1.20%      
Allowance for credit losses on loans $ 2,974 2,973 $ 2,859 2,662 2,588 2,482
Consumer loans | Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross loans $ 74,269   $ 70,164      
Ratio of loan type to all loans 0.30%   0.40%      
Allowance for credit losses on loans $ 3,004 $ 3,029 $ 2,832 $ 2,776 $ 2,810 $ 2,875