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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 206,899 [1] $ 187,630
Balance at end of period 210,375 193,325
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period [2] 59 61
Other comprehensive loss [2] (17) (17)
Balance at end of period [2] 42 44
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] 75 87
Other comprehensive loss [2] (18) (17)
Balance at end of period [2] 57 70
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] (16) (26)
Other comprehensive loss [2] 1 0
Balance at end of period [2] $ (15) $ (26)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.