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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Mar. 31, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 157,753 $ 36,598
Held to maturity, 12 Months or Longer, Estimated Fair Value 3,772 16
Held to maturity, Total, Estimated Fair Value 161,525 36,614
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (5,172) (244)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (38) 0
Held to maturity, Total, Gross Unrealized Losses $ (5,210) $ (244)
Held to maturity, Less Than 12 Months, Quantity | security 49 14
Held to maturity, 12 Months or Longer, Quantity | security 6 4
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 12,072 $ 20,146
Available for sale, 12 Months or Longer, Estimated Fair Value 17,391 5,491
Available for sale, Total, Estimated Fair Value 29,463 25,637
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (27) (103)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (199) (11)
Available for sale, Total, Gross Unrealized Losses $ (226) $ (114)
Available-for-sale, Less than 12 Months, Quantity | security 10 13
Available-for-sale, 12 Months or Longer, Quantity | security 10 3
Mortgage-backed Securities, U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 8,405 $ 18,795
Held to maturity, 12 Months or Longer, Estimated Fair Value 416 0
Held to maturity, Total, Estimated Fair Value 8,821 18,795
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (507) (99)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1) 0
Held to maturity, Total, Gross Unrealized Losses $ (508) $ (99)
Held to maturity, Less Than 12 Months, Quantity | security 10 5
Held to maturity, 12 Months or Longer, Quantity | security 4 0
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 12,072 $ 20,146
Available for sale, 12 Months or Longer, Estimated Fair Value 17,391 5,491
Available for sale, Total, Estimated Fair Value 29,463 25,637
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (27) (103)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (199) (11)
Available for sale, Total, Gross Unrealized Losses $ (226) $ (114)
Available-for-sale, Less than 12 Months, Quantity | security 10 13
Available-for-sale, 12 Months or Longer, Quantity | security 10 3
Mortgage-backed Securities, Private label residential    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 21,091 $ 8,091
Held to maturity, 12 Months or Longer, Estimated Fair Value 3,356 15
Held to maturity, Total, Estimated Fair Value 24,447 8,106
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (505) (122)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (37) 0
Held to maturity, Total, Gross Unrealized Losses $ (542) $ (122)
Held to maturity, Less Than 12 Months, Quantity | security 15 5
Held to maturity, 12 Months or Longer, Quantity | security 1 3
Private label residential    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 127,757  
Held to maturity, 12 Months or Longer, Estimated Fair Value 0  
Held to maturity, Total, Estimated Fair Value 127,757  
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (4,150)  
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0  
Held to maturity, Total, Gross Unrealized Losses $ (4,150)  
Held to maturity, Less Than 12 Months, Quantity | security 23  
Held to maturity, 12 Months or Longer, Quantity | security 1  
Bank issued trust preferred securities    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 500 $ 9,712
Held to maturity, 12 Months or Longer, Estimated Fair Value 0 1
Held to maturity, Total, Estimated Fair Value 500 9,713
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (10) (23)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0 0
Held to maturity, Total, Gross Unrealized Losses $ (10) $ (23)
Held to maturity, Less Than 12 Months, Quantity | security 1 4
Held to maturity, 12 Months or Longer, Quantity | security 0 1