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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 252,524 $ 238,679 $ 245,413 [1] $ 233,073
Balance at end of period 256,664 241,223 256,664 241,223
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (670) (745) 20 (1,084)
Balance of AOCI at the beginning of period (105) 200 (795) 539
Balance at end of period (775) (545) (775) (545)
Accumulated Net Unrealized Investment Gain (Loss) | Available-for-sale Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (670) (745) 20 (1,075)
Balance of AOCI at the beginning of period (105) 200 (795) 530
Balance at end of period $ (775) (545) $ (775) (545)
Accumulated Net Unrealized Investment Gain (Loss) | Held-to-maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period       (9)
Balance of AOCI at the beginning of period       9
Balance at end of period   $ 0   $ 0
[1] Derived from audited consolidated financial statements.