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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Oct. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 124,657 [1] $ 111,000  
Balance at end of period 156,905 114,112  
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period [2] (129) (124)  
Other comprehensive loss [2] (79) (12)  
Balance at end of period [2] (145) (136)  
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] (58) (19)  
Other comprehensive loss [2] (86) (7)  
Balance at end of period [2] (81) (26)  
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] (71) (105)  
Other comprehensive loss [2] 7 (5)  
Balance at end of period [2] $ (64) $ (110)  
Accounting Standards Update 2016-01      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Adoption of ASU 2016-01     $ 0
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Adoption of ASU 2016-01     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]      
Adoption of ASU 2016-01     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]      
Adoption of ASU 2016-01     $ 0
[1] Derived from audited consolidated financial statements.
[2] All amounts are net of income taxes.