v3.26.1
Loans Receivable - Schedule of Loan Modifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount     $ 84,773 $ 149,242
% of Total Loan Class Balance 0.22% 0.48% 0.41% 0.71%
Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount $ 45,050 $ 91,800 $ 71,180 $ 137,657
Payment Deferral        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount $ 0 $ 8,283 13,593 8,283
Commercial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount     $ 74,186 $ 140,193
% of Total Loan Class Balance 0.36% 0.77% 0.59% 1.15%
Commercial loans | Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount $ 45,050 $ 91,800 $ 71,180 $ 137,208
Weighted average term extension 3 months 7 months 7 months 10 months
Commercial loans | Payment Deferral        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount $ 0 $ 0 $ 3,006 $ 0
Deferral Amount $ 0 $ 0 167 0
Commercial loans | Multi-family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount     0 $ 22,196
% of Total Loan Class Balance   0.43%   0.46%
Commercial loans | Multi-family | Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount   $ 21,103   $ 22,196
Weighted average term extension   15 months   14 months
Commercial loans | Multi-family | Payment Deferral        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount   $ 0   $ 0
Deferral Amount   $ 0   0
Commercial loans | Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount     $ 22,333 $ 20,346
% of Total Loan Class Balance 0.53% 0.41% 0.61% 0.56%
Commercial loans | Commercial real estate | Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount $ 19,327 $ 14,953 $ 19,327 $ 20,346
Weighted average term extension 3 months 6 months 6 months 11 months
Commercial loans | Commercial real estate | Payment Deferral        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount $ 0 $ 0 $ 3,006 $ 0
Deferral Amount $ 0 $ 0 167 0
Commercial loans | Commercial & industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount     $ 51,853 $ 59,942
% of Total Loan Class Balance 0.83% 0.79% 1.67% 2.48%
Commercial loans | Commercial & industrial | Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount $ 25,723 $ 18,035 $ 51,853 $ 56,957
Weighted average term extension 4 months 5 months 8 months 12 months
Commercial loans | Commercial & industrial | Payment Deferral        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount $ 0 $ 0 $ 0 $ 0
Deferral Amount $ 0 $ 0 0 0
Commercial loans | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount     0 $ 37,709
% of Total Loan Class Balance   0.04%   0.04%
Commercial loans | Construction | Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount   $ 37,709   $ 37,709
Weighted average term extension   5 months   5 months
Commercial loans | Construction | Payment Deferral        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount   $ 0   $ 0
Deferral Amount   $ 0   0
Consumer loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount     $ 10,587 $ 9,049
% of Total Loan Class Balance   0.10% 0.14% 0.11%
Consumer loans | Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount   $ 0 $ 0 $ 449
Weighted average term extension   0 months 0 months 6 months
Consumer loans | Payment Deferral        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount   $ 8,283 $ 10,587 $ 8,283
Deferral Amount   $ 110 306 236
Consumer loans | Single-family residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount     $ 10,587 $ 9,049
% of Total Loan Class Balance   0.10% 0.14% 0.11%
Consumer loans | Single-family residential | Term Extension        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount   $ 0 $ 0 $ 449
Weighted average term extension   0 months 0 months 6 months
Consumer loans | Single-family residential | Payment Deferral        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified in period, amount   $ 8,283 $ 10,587 $ 8,283
Deferral Amount   $ 110 $ 306 $ 236