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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 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 $ 104,829 $ 92,262 104,829 92,262
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] (189) (315) (175) (313)
Net change, net of income taxes [2] 11 29 (3) 27
Balance at end of period [2] (178) (286) (178) (286)
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) (9) 4 3
Net change, net of income taxes [2] 0 11 (27) (1)
Balance at end of period [2] (23) 2 (23) 2
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] (166) (306) (179) (316)
Net change, net of income taxes [2] 11 18 24 28
Balance at end of period [2] $ (155) $ (288) $ (155) $ (288)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.