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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 237,369 $ 223,549 $ 233,073 [1] $ 218,569
Balance at end of period 238,679 227,661 238,679 227,661
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] (827) (735) (1,084) (717)
Other comprehensive income [2] 82 240 339 222
Balance at end of period [2] (745) (495) (745) (495)
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] (827) (725) (1,075) (706)
Other comprehensive income [2] 82 239 330 220
Balance at end of period [2] (745) (486) (745) (486)
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 (10) (9) (11)
Other comprehensive income [2] 0 1 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.