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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 21,446 $ 5,636
Held to maturity, 12 Months or Longer, Estimated Fair Value 17 50
Held to maturity, Total, Estimated Fair Value 21,463 5,686
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (100) (3)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0 (2)
Held to maturity, Total, Gross Unrealized Losses $ (100) $ (5)
Held to maturity, Less Than 12 Months, Quantity | security 10 6
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 $ 26,667 $ 21,464
Available for sale, 12 Months or Longer, Estimated Fair Value 926 0
Available for sale, Total, Estimated Fair Value 27,593 21,464
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (86) (68)
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0 0
Available for sale, Total, Gross Unrealized Losses $ (86) $ (68)
Available-for-sale, Less than 12 Months, Quantity | security 15 11
Available-for-sale, 12 Months or Longer, Quantity | security 1 0
Mortgage-backed Securities, U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 4,269 $ 5,130
Held to maturity, 12 Months or Longer, Estimated Fair Value 16 39
Held to maturity, Total, Estimated Fair Value 4,285 5,169
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (19) (2)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0 (1)
Held to maturity, Total, Gross Unrealized Losses $ (19) $ (3)
Held to maturity, Less Than 12 Months, Quantity | security 5 4
Held to maturity, 12 Months or Longer, Quantity | security 3 4
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 26,667 $ 21,464
Available for sale, 12 Months or Longer, Estimated Fair Value 926 0
Available for sale, Total, Estimated Fair Value 27,593 21,464
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (86) (68)
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0 0
Available for sale, Total, Gross Unrealized Losses $ (86) $ (68)
Available-for-sale, Less than 12 Months, Quantity | security 15 11
Available-for-sale, 12 Months or Longer, Quantity | security 1 0
Mortgage-backed Securities, Private label residential    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 8,223 $ 7
Held to maturity, 12 Months or Longer, Estimated Fair Value 1 11
Held to maturity, Total, Estimated Fair Value 8,224 18
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (22) 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0 (1)
Held to maturity, Total, Gross Unrealized Losses $ (22) $ (1)
Held to maturity, Less Than 12 Months, Quantity | security 2 1
Held to maturity, 12 Months or Longer, Quantity | security 1 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 $ 8,954  
Held to maturity, 12 Months or Longer, Estimated Fair Value 0  
Held to maturity, Total, Estimated Fair Value 8,954  
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (59)  
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0  
Held to maturity, Total, Gross Unrealized Losses $ (59)  
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   $ 499
Held to maturity, 12 Months or Longer, Estimated Fair Value   0
Held to maturity, Total, Estimated Fair Value   499
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses   (1)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses   0
Held to maturity, Total, Gross Unrealized Losses   $ (1)
Held to maturity, Less Than 12 Months, Quantity | security   1
Held to maturity, 12 Months or Longer, Quantity | security   0