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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
security
Sep. 30, 2018
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 5,062 $ 8,900
Held to maturity, 12 Months or Longer, Estimated Fair Value 3,075 3,049
Held to maturity, Total, Estimated Fair Value 8,137 11,949
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (2) (42)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (17) (64)
Held to maturity, Total, Gross Unrealized Losses $ (19) $ (106)
Held to maturity, Less Than 12 Months, Quantity | security 4 4
Held to maturity, 12 Months or Longer, Quantity | security 13 14
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 1,074 $ 34
Available for sale, 12 Months or Longer, Estimated Fair Value 0 917
Available for sale, Total, Estimated Fair Value 1,074 951
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (7) (1)
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0 (83)
Available for sale, Total, Gross Unrealized Losses $ (7) $ (84)
Available-for-sale, Less than 12 Months, Quantity | security 1 1
Available-for-sale, 12 Months or Longer, Quantity | security 0 1
Mortgage-backed Securities, U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 64 $ 954
Held to maturity, 12 Months or Longer, Estimated Fair Value 53 64
Held to maturity, Total, Estimated Fair Value 117 1,018
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (1) (20)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (1) (1)
Held to maturity, Total, Gross Unrealized Losses $ (2) $ (21)
Held to maturity, Less Than 12 Months, Quantity | security 2 2
Held to maturity, 12 Months or Longer, Quantity | security 5 5
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 1,074 $ 34
Available for sale, 12 Months or Longer, Estimated Fair Value 0 0
Available for sale, Total, Estimated Fair Value 1,074 34
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (7) (1)
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0 0
Available for sale, Total, Gross Unrealized Losses $ (7) $ (1)
Available-for-sale, Less than 12 Months, Quantity | security 1 1
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 $ 2 $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value 38 50
Held to maturity, Total, Estimated Fair Value 40 50
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 (2) (2)
Held to maturity, Total, Gross Unrealized Losses $ (2) $ (2)
Held to maturity, Less Than 12 Months, Quantity | security 1 0
Held to maturity, 12 Months or Longer, Quantity | security 7 8
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value   $ 0
Available for sale, 12 Months or Longer, Estimated Fair Value   917
Available for sale, Total, Estimated Fair Value   917
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses   0
Available for sale, 12 Months or Longer, Gross Unrealized Losses   (83)
Available for sale, Total, Gross Unrealized Losses   $ (83)
Available-for-sale, Less than 12 Months, Quantity | security   0
Available-for-sale, 12 Months or Longer, Quantity | security   1
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 $ 4,996 $ 7,946
Held to maturity, 12 Months or Longer, Estimated Fair Value 2,984 2,935
Held to maturity, Total, Estimated Fair Value 7,980 10,881
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (1) (22)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (14) (61)
Held to maturity, Total, Gross Unrealized Losses $ (15) $ (83)
Held to maturity, Less Than 12 Months, Quantity | security 1 2
Held to maturity, 12 Months or Longer, Quantity | security 1 1