v3.26.1
Borrowed Funds (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Sep. 30, 2025
Interest rate swap, notional amount $ 100,000   $ 100,000   $ 100,000
FHLB Advances, Variable Rate 100,000   $ 100,000   $ 100,000
Interest rate swap, remaining term to maturity     2 years 2 months 12 days   2 years 8 months 12 days
Interest rate swap $ 1,300   $ 1,300   $ 926
Derivative Asset, balance sheet location Other assets   Other assets   Other assets
Interest rate swap, amount reclassified from AOCI $ (136) $ (554) $ (342) $ (1,252)  
Interest rate swap, future amount to be reclassified from AOCI     (693)    
Interest rate swap, collateral held (1,600)   (1,600)   $ (920)
Prepaid FHLB Advances [Member]          
FHLB Advances, Amount $ 425,000   $ 425,000    
FHLB Advances, Interest Rate 4.32%   4.32%    
FHLB Advances, Term     9 months 18 days    
FHLB Advances, Prepayment Penalties     $ 2,100    
Replacement FHLB Advances [Member]          
FHLB Advances, Amount $ 425,000   $ 425,000    
FHLB Advances, Interest Rate 3.79%   3.79%    
FHLB Advances, Term     2 years 3 months 18 days