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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period     $ 111,000 [1] $ 96,834
Balance at end of period $ 120,894 $ 108,616 120,894 108,616
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] (132) (178) (124) (175)
Net change [2] (2) 16 (10) 13
Balance at end of period [2] (134) (162) (134) (162)
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] (44) (23) (19) 4
Net change [2] (7) 5 (32) (22)
Balance at end of period [2] (51) (18) (51) (18)
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] (88) (155) (105) (179)
Net change [2] 5 11 22 35
Balance at end of period [2] $ (83) $ (144) $ (83) $ (144)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.