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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 16,384 $ 5,636
Held to maturity, 12 Months or Longer, Estimated Fair Value 36 50
Held to maturity, Total, Estimated Fair Value 16,420 5,686
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (102) (3)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1) (2)
Held to maturity, Total, Gross Unrealized Losses $ (103) $ (5)
Held to maturity, Less Than 12 Months, Quantity | security 8 6
Held to maturity, 12 Months or Longer, Quantity | security 6 6
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 22,873 $ 21,464
Available for sale, 12 Months or Longer, Estimated Fair Value 0 0
Available for sale, Total, Estimated Fair Value 22,873 21,464
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (99) (68)
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0 0
Available for sale, Total, Gross Unrealized Losses $ (99) $ (68)
Available-for-sale, Less than 12 Months, Quantity | security 12 11
Available-for-sale, 12 Months or Longer, Quantity | security 0 0
Mortgage-backed Securities, U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 2,098 $ 5,130
Held to maturity, 12 Months or Longer, Estimated Fair Value 34 39
Held to maturity, Total, Estimated Fair Value 2,132 5,169
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (8) (2)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1) (1)
Held to maturity, Total, Gross Unrealized Losses $ (9) $ (3)
Held to maturity, Less Than 12 Months, Quantity | security 3 4
Held to maturity, 12 Months or Longer, Quantity | security 4 4
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 22,873 $ 21,464
Available for sale, 12 Months or Longer, Estimated Fair Value 0 0
Available for sale, Total, Estimated Fair Value 22,873 21,464
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (99) (68)
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0 0
Available for sale, Total, Gross Unrealized Losses $ (99) $ (68)
Available-for-sale, Less than 12 Months, Quantity | security 12 11
Available-for-sale, 12 Months or Longer, Quantity | security 0 0
Mortgage-backed Securities, Private label residential    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 4,836 $ 7
Held to maturity, 12 Months or Longer, Estimated Fair Value 2 11
Held to maturity, Total, Estimated Fair Value 4,838 18
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (23) 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0 (1)
Held to maturity, Total, Gross Unrealized Losses $ (23) $ (1)
Held to maturity, Less Than 12 Months, Quantity | security 1 1
Held to maturity, 12 Months or Longer, Quantity | security 2 2
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 $ 8,953  
Held to maturity, 12 Months or Longer, Estimated Fair Value 0  
Held to maturity, Total, Estimated Fair Value 8,953  
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (68)  
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0  
Held to maturity, Total, Gross Unrealized Losses $ (68)  
Held to maturity, Less Than 12 Months, Quantity | security 3  
Held to maturity, 12 Months or Longer, Quantity | security 0  
Bank issued trust preferred securities    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 497 $ 499
Held to maturity, 12 Months or Longer, Estimated Fair Value 0 0
Held to maturity, Total, Estimated Fair Value 497 499
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (3) (1)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0 0
Held to maturity, Total, Gross Unrealized Losses $ (3) $ (1)
Held to maturity, Less Than 12 Months, Quantity | security 1 1
Held to maturity, 12 Months or Longer, Quantity | security 0 0