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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period     $ 89,187 [1] $ 82,778
Balance at end of period $ 94,452 $ 87,290 94,452 87,290
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] (286) (347) (313) (339)
Net change, net of income taxes [2] 13 8 40 0
Balance at end of period [2] (273) (339) (273) (339)
Available-for-sale Securities | Accumulated Net Unrealized Investment Gain (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] 2 12 3 37
Net change, net of income taxes [2] 6 (14) 5 (39)
Balance at end of period [2] 8 (2) 8 (2)
Held-to-maturity Securities | Accumulated Net Unrealized Investment Gain (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] (288) (359) (316) (376)
Net change, net of income taxes [2] 7 22 35 39
Balance at end of period [2] $ (281) $ (337) $ (281) $ (337)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.