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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 111,000 [1] $ 96,834
Balance at end of period 114,112 99,634
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period [2] (124) (175)
Net change [2] (12) (14)
Balance at end of period [2] (136) (189)
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] (19) 4
Net change [2] (7) (27)
Balance at end of period [2] (26) (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] (105) (179)
Net change [2] (5) 13
Balance at end of period [2] $ (110) $ (166)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.