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Debt Securities - Narrative (Details)
3 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
security
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
security
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value $ 165,714,000     $ 121,786,000
Proceeds from sale of securities available for sale 0 $ 0    
Gross realized gain (loss) 0 $ 0    
Securities available for sale pledged as collateral market value $ 94,208,000     $ 94,876,000
Number of securities with unrealized losses | security 91     100
Other than temporary impairment losses $ 0   $ 0  
Collateral Pledged        
Debt Securities, Available-for-sale [Line Items]        
Estimated Fair Value $ 93,499,000     $ 94,337,000