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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
security
Sep. 30, 2018
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 6,413 $ 8,900
Held to maturity, 12 Months or Longer, Estimated Fair Value 6,941 3,049
Held to maturity, Total, Estimated Fair Value 13,354 11,949
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (17) (42)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (78) (64)
Held to maturity, Total, Gross Unrealized Losses $ (95) $ (106)
Held to maturity, Less Than 12 Months, Quantity | security 8 4
Held to maturity, 12 Months or Longer, Quantity | security 15 14
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 2,004 $ 34
Available for sale, 12 Months or Longer, Estimated Fair Value 0 0
Available for sale, Total, Estimated Fair Value 2,004 34
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (110) (1)
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0 0
Available for sale, Total, Gross Unrealized Losses $ (110) $ (1)
Available-for-sale, Less than 12 Months, Quantity | security 7 1
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 $ 1,443 $ 954
Held to maturity, 12 Months or Longer, Estimated Fair Value 960 64
Held to maturity, Total, Estimated Fair Value 2,403 1,018
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (10) (20)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (15) (1)
Held to maturity, Total, Gross Unrealized Losses $ (25) $ (21)
Held to maturity, Less Than 12 Months, Quantity | security 7 2
Held to maturity, 12 Months or Longer, Quantity | security 6 5
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 2,004 $ 34
Available for sale, 12 Months or Longer, Estimated Fair Value 0 0
Available for sale, Total, Estimated Fair Value 2,004 34
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses (110) (1)
Available for sale, 12 Months or Longer, Gross Unrealized Losses 0 0
Available for sale, Total, Gross Unrealized Losses $ (110) $ (1)
Available-for-sale, Less than 12 Months, Quantity | security 7 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 $ 0 $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value 45 50
Held to maturity, Total, Estimated Fair Value 45 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 0 0
Held to maturity, 12 Months or Longer, Quantity | security 7 8
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 $ 4,970 $ 7,946
Held to maturity, 12 Months or Longer, Estimated Fair Value 5,936 2,935
Held to maturity, Total, Estimated Fair Value 10,906 10,881
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (7) (22)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (61) (61)
Held to maturity, Total, Gross Unrealized Losses $ (68) $ (83)
Held to maturity, Less Than 12 Months, Quantity | security 1 2
Held to maturity, 12 Months or Longer, Quantity | security 2 1