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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 210,375 $ 193,325 $ 206,899 [1] $ 187,630
Balance at end of period 212,269 198,543 212,269 198,543
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] 42 44 59 61
Other comprehensive income (loss) [2] (149) 77 (166) 60
Balance at end of period [2] (107) 121 (107) 121
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] 57 70 75 87
Other comprehensive income (loss) [2] (152) 74 (170) 57
Balance at end of period [2] (95) 144 (95) 144
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] (15) (26) (16) (26)
Other comprehensive income (loss) [2] 3 3 4 3
Balance at end of period [2] $ (12) $ (23) $ (12) $ (23)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.