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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 162,338 $ 117,843 $ 124,657 [1] $ 111,000
Balance at end of period 166,269 120,894 166,269 120,894
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period [2] (45) (132) (129) (124)
Other comprehensive income [2] 12 (2) 33 (10)
Balance at end of period [2] (33) (134) (33) (134)
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] 3 (44) (58) (19)
Other comprehensive income [2] 9 (7) 7 (32)
Balance at end of period [2] 12 (51) 12 (51)
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] (48) (88) (71) (105)
Other comprehensive income [2] 3 5 26 22
Balance at end of period [2] $ (45) $ (83) (45) $ (83)
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other comprehensive income [2]     63  
Accounting Standards Update 2016-01 | Accumulated Net Unrealized Investment Gain (Loss) | Available-for-sale Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other comprehensive income [2]     63  
Accounting Standards Update 2016-01 | Accumulated Net Unrealized Investment Gain (Loss) | Held-to-maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other comprehensive income [2]     $ 0  
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.