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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 198,543 $ 178,008 $ 187,630 [1] $ 171,067
Balance at end of period 203,492 182,806 203,492 182,806
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] 121 (179) 61 50
Other comprehensive income [2] 8 155 68 (74)
Balance at end of period [2] 129 (24) 129 (24)
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] 144 (151) 87 90
Other comprehensive income [2] 1 154 58 (87)
Balance at end of period [2] 145 3 145 3
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] (23) (28) (26) (40)
Other comprehensive income [2] 7 1 10 13
Balance at end of period [2] $ (16) $ (27) $ (16) $ (27)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.