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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
security
Sep. 30, 2021
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 65,425 $ 36,598
Held to maturity, 12 Months or Longer, Estimated Fair Value 15 16
Held to maturity, Total, Estimated Fair Value 65,440 36,614
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (571) (244)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0 0
Held to maturity, Total, Gross Unrealized Losses $ (571) $ (244)
Held to maturity, Less Than 12 Months, Quantity | security 24 14
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 $ 9,941 $ 20,146
Available for sale, 12 Months or Longer, Estimated Fair Value 13,439 5,491
Available for sale, Total, Estimated Fair Value 23,380 25,637
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (66) (103)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (43) (11)
Available for sale, Total, Gross Unrealized Losses $ (109) $ (114)
Available-for-sale, Less than 12 Months, Quantity | security 10 13
Available-for-sale, 12 Months or Longer, Quantity | security 7 3
Mortgage-backed Securities, U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 40,171 $ 18,795
Held to maturity, 12 Months or Longer, Estimated Fair Value 0 0
Held to maturity, Total, Estimated Fair Value 40,171 18,795
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (285) (99)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0 0
Held to maturity, Total, Gross Unrealized Losses $ (285) $ (99)
Held to maturity, Less Than 12 Months, Quantity | security 10 5
Held to maturity, 12 Months or Longer, Quantity | security 0 0
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 9,941 $ 20,146
Available for sale, 12 Months or Longer, Estimated Fair Value 13,439 5,491
Available for sale, Total, Estimated Fair Value 23,380 25,637
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (66) (103)
Available for sale, 12 Months or Longer, Gross Unrealized Losses (43) (11)
Available for sale, Total, Gross Unrealized Losses $ (109) $ (114)
Available-for-sale, Less than 12 Months, Quantity | security 10 13
Available-for-sale, 12 Months or Longer, Quantity | security 7 3
Mortgage-backed Securities, Private label residential    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 8,213 $ 8,091
Held to maturity, 12 Months or Longer, Estimated Fair Value 14 15
Held to maturity, Total, Estimated Fair Value 8,227 8,106
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (192) (122)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0 0
Held to maturity, Total, Gross Unrealized Losses $ (192) $ (122)
Held to maturity, Less Than 12 Months, Quantity | security 5 5
Held to maturity, 12 Months or Longer, Quantity | security 3 3
Private label residential    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 17,041  
Held to maturity, 12 Months or Longer, Estimated Fair Value 1  
Held to maturity, Total, Estimated Fair Value 17,042  
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (94)  
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0  
Held to maturity, Total, Gross Unrealized Losses $ (94)  
Held to maturity, Less Than 12 Months, Quantity | security 9  
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   $ 9,712
Held to maturity, 12 Months or Longer, Estimated Fair Value   1
Held to maturity, Total, Estimated Fair Value   9,713
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses   (23)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses   0
Held to maturity, Total, Gross Unrealized Losses   $ (23)
Held to maturity, Less Than 12 Months, Quantity | security   4
Held to maturity, 12 Months or Longer, Quantity | security   1