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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 238,679 $ 227,661 $ 233,073 [1] $ 218,569
Balance at end of period 241,223 229,263 241,223 229,263
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] (745) (495) (1,084) (717)
Other comprehensive income [2] 200 (249) 539 (27)
Balance at end of period [2] (545) (744) (545) (744)
Accumulated Net Unrealized Investment Gain (Loss) | Available-for-sale Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] (745) (486) (1,075) (706)
Other comprehensive income [2] 200 (249) 530 (29)
Balance at end of period [2] (545) (735) (545) (735)
Accumulated Net Unrealized Investment Gain (Loss) | Held-to-maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] 0 (9) (9) (11)
Other comprehensive income [2] 0 0 9 2
Balance at end of period [2] $ 0 $ (9) $ 0 $ (9)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.