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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period     $ 96,834 [1] $ 89,187
Balance at end of period $ 108,616 $ 94,452 108,616 94,452
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] (178) (286) (175) (313)
Net change [2] 16 13 13 40
Balance at end of period [2] (162) (273) (162) (273)
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] (23) 2 4 3
Net change [2] 5 6 (22) 5
Balance at end of period [2] (18) 8 (18) 8
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] (155) (288) (179) (316)
Net change [2] 11 7 35 35
Balance at end of period [2] $ (144) $ (281) $ (144) $ (281)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.