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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 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 $ 117,843 $ 104,829 117,843 104,829
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] (136) (189) (124) (175)
Net change [2] 4 11 (8) (3)
Balance at end of period [2] (132) (178) (132) (178)
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] (26) (23) (19) 4
Net change [2] (18) 0 (25) (27)
Balance at end of period [2] (44) (23) (44) (23)
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] (110) (166) (105) (179)
Net change [2] 22 11 17 24
Balance at end of period [2] $ (88) $ (155) $ (88) $ (155)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.