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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 96,834 [1] $ 89,187
Balance at end of period 99,634 91,051
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period [2] (175) (313)
Net change, net of income taxes [2] (14) (2)
Balance at end of period [2] (189) (315)
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] 4 3
Net change, net of income taxes [2] (27) (12)
Balance at end of period [2] (23) (9)
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] (179) (316)
Net change, net of income taxes [2] 13 10
Balance at end of period [2] $ (166) $ (306)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.