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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 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 $ 92,262 $ 85,424 92,262 85,424
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] (315) (364) (313) (339)
Net change, net of income taxes [2] 29 17 27 (8)
Balance at end of period [2] (286) (347) (286) (347)
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] (9) 4 3 37
Net change, net of income taxes [2] 11 8 (1) (25)
Balance at end of period [2] 2 12 2 12
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] (306) (368) (316) (376)
Net change, net of income taxes [2] 18 9 28 17
Balance at end of period [2] $ (288) $ (359) $ (288) $ (359)
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.