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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 245,413 [1] $ 233,073
Balance at end of period 249,199 237,369
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period [2] 20 (1,084)
Other comprehensive loss [2] (812) 257
Balance at end of period [2] (792) (827)
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] 20 (1,075)
Other comprehensive loss [2] (812) 248
Balance at end of period [2] $ (792) (827)
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 loss [2]   9
Balance at end of period [2]   $ 0
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.