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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Jun. 30, 2020
USD ($)
security
Sep. 30, 2019
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 7,021 $ 291
Held to maturity, 12 Months or Longer, Estimated Fair Value 52 3,090
Held to maturity, Total, Estimated Fair Value 7,073 3,381
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (11) (1)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (2) (10)
Held to maturity, Total, Gross Unrealized Losses $ (13) $ (11)
Held to maturity, Less Than 12 Months, Quantity | security 6 2
Held to maturity, 12 Months or Longer, Quantity | security 6 12
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 35,709  
Available for sale, 12 Months or Longer, Estimated Fair Value 0  
Available for sale, Total, Estimated Fair Value 35,709  
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (29)  
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0  
Available for sale, Total, Gross Unrealized Losses $ (29)  
Available-for-sale, Less than 12 Months, Quantity | security 9  
Available-for-sale, 12 Months or Longer, Quantity | security 0  
Mortgage-backed Securities, U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 7,014 $ 291
Held to maturity, 12 Months or Longer, Estimated Fair Value 41 76
Held to maturity, Total, Estimated Fair Value 7,055 367
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (11) (1)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1) (1)
Held to maturity, Total, Gross Unrealized Losses $ (12) $ (2)
Held to maturity, Less Than 12 Months, Quantity | security 5 2
Held to maturity, 12 Months or Longer, Quantity | security 4 6
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 35,709  
Available for sale, 12 Months or Longer, Estimated Fair Value 0  
Available for sale, Total, Estimated Fair Value 35,709  
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (29)  
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0  
Available for sale, Total, Gross Unrealized Losses $ (29)  
Available-for-sale, Less than 12 Months, Quantity | security 9  
Available-for-sale, 12 Months or Longer, Quantity | security 0  
Mortgage-backed Securities, Private label residential    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 7 $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value 11 23
Held to maturity, Total, Estimated Fair Value 18 23
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses 0 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1) (1)
Held to maturity, Total, Gross Unrealized Losses $ (1) $ (1)
Held to maturity, Less Than 12 Months, Quantity | security 1 0
Held to maturity, 12 Months or Longer, Quantity | security 2 5
U.S. Treasury and U.S. government agency securities    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value   $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value   2,991
Held to maturity, Total, Estimated Fair Value   2,991
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses   0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses   (8)
Held to maturity, Total, Gross Unrealized Losses   $ (8)
Held to maturity, Less Than 12 Months, Quantity | security   0
Held to maturity, 12 Months or Longer, Quantity | security   1