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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 233,073 [1] $ 218,569
Balance at end of period 237,369 223,549
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period [2] (1,084) (717)
Other comprehensive income [2] 257 (18)
Balance at end of period [2] (827) (735)
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] (1,075) (706)
Other comprehensive income [2] 248 (19)
Balance at end of period [2] (827) (725)
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) (11)
Other comprehensive income [2] 9 1
Balance at end of period [2] $ 0 $ (10)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.