v3.26.1
Loans Receivable - Schedule of Loans on Non-accrual Status (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual percent of total loans 0.63% 0.63%
Financial Asset Originated    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual $ 127,569 $ 128,628
Non-accrual with no ACL 0 0
90 days or more past due and accruing 0 0
Financial Asset Originated | Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual 103,104 103,540
Non-accrual with no ACL 0 0
90 days or more past due and accruing 0 0
Financial Asset Originated | Commercial loans | Multi-family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual 34,249 19,121
Non-accrual with no ACL 0 0
90 days or more past due and accruing 0 0
Financial Asset Originated | Commercial loans | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual 3,114 69,972
Non-accrual with no ACL 0 0
90 days or more past due and accruing 0 0
Financial Asset Originated | Commercial loans | Commercial & industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual 65,741 11,047
Non-accrual with no ACL 0 0
90 days or more past due and accruing 0 0
Financial Asset Originated | Commercial loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual 0 3,400
Non-accrual with no ACL 0 0
90 days or more past due and accruing 0 0
Financial Asset Originated | Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual 24,465 25,088
Non-accrual with no ACL 0 0
90 days or more past due and accruing 0 0
Financial Asset Originated | Consumer loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual 892 760
Non-accrual with no ACL 0 0
90 days or more past due and accruing 0 0
Financial Asset Originated | Consumer loans | Single-family residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual 22,445 23,741
Non-accrual with no ACL 0 0
90 days or more past due and accruing 0 0
Financial Asset Originated | Consumer loans | Land - consumer lot loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual 239 23
Non-accrual with no ACL 0 0
90 days or more past due and accruing 0 0
Financial Asset Originated | Consumer loans | HELOC    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual 627 412
Non-accrual with no ACL 0 0
90 days or more past due and accruing 0 0
Financial Asset Originated | Consumer loans | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual 262 152
Non-accrual with no ACL 0 0
90 days or more past due and accruing $ 0 $ 0