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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 249,199 $ 237,369 $ 245,413 [1] $ 233,073
Balance at end of period 252,524 238,679 252,524 238,679
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] (792) (827) 20 (1,084)
Other comprehensive income [2] 122 82 (690) 339
Balance at end of period [2] (670) (745) (670) (745)
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] (792) (827) 20 (1,075)
Other comprehensive income [2] 122 82 (690) 330
Balance at end of period [2] $ (670) (745) $ (670) (745)
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]       (9)
Other comprehensive income [2]       9
Balance at end of period [2]   $ 0   $ 0
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.