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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
security
Sep. 30, 2017
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 6,985 $ 2,984
Held to maturity, 12 Months or Longer, Estimated Fair Value 147 199
Held to maturity, Total, Estimated Fair Value 7,132 3,183
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (92) (9)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses (2) (3)
Held to maturity, Total, Gross Unrealized Losses $ (94) $ (12)
Held to maturity, Less Than 12 Months, Quantity | security 4 1
Held to maturity, 12 Months or Longer, Quantity | security 15 16
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 35 $ 0
Available for sale, 12 Months or Longer, Estimated Fair Value 931 952
Available for sale, Total, Estimated Fair Value 966 952
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses 0 0
Available for sale, 12 Months or Longer, Gross Unrealized Losses (69) (48)
Available for sale, Total, Gross Unrealized Losses $ (69) $ (48)
Available-for-sale, Less than 12 Months, Quantity | security 1 0
Available-for-sale, 12 Months or Longer, Quantity | security 1 1
Mortgage-backed Securities, U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Held to maturity, Less Than 12 Months, Estimated Fair Value $ 1,063 $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value 71 114
Held to maturity, Total, Estimated Fair Value 1,134 114
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (18) 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0 (1)
Held to maturity, Total, Gross Unrealized Losses $ (18) $ (1)
Held to maturity, Less Than 12 Months, Quantity | security 2 0
Held to maturity, 12 Months or Longer, Quantity | security 5 6
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 35  
Available for sale, 12 Months or Longer, Estimated Fair Value 0  
Available for sale, Total, Estimated Fair Value 35  
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 0  
Available for sale, Total, Gross Unrealized Losses $ 0  
Available-for-sale, Less than 12 Months, Quantity | security 1  
Available-for-sale, 12 Months or Longer, Quantity | security 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 76 85
Held to maturity, Total, Estimated Fair Value 76 85
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 10 10
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 $ 5,922 $ 2,984
Held to maturity, 12 Months or Longer, Estimated Fair Value 0 0
Held to maturity, Total, Estimated Fair Value 5,922 2,984
Held-to-maturity Securities, Gross Unrealized Losses    
Held to maturity, Less Than 12 Months, Gross Unrealized Losses (74) (9)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses 0 0
Held to maturity, Total, Gross Unrealized Losses $ (74) $ (9)
Held to maturity, Less Than 12 Months, Quantity | security 2 1
Held to maturity, 12 Months or Longer, Quantity | security 0 0
Mutual funds    
Available-for-sale Securities, Fair Value:    
Available for sale, Less Than 12 Months, Estimated Fair Value $ 0 $ 0
Available for sale, 12 Months or Longer, Estimated Fair Value 931 952
Available for sale, Total, Estimated Fair Value 931 952
Available-for-sale Securities, Gross Unrealized Losses:    
Available for sale, Less Than 12 Months, Gross Unrealized Losses 0 0
Available for sale, 12 Months or Longer, Gross Unrealized Losses (69) (48)
Available for sale, Total, Gross Unrealized Losses $ (69) $ (48)
Available-for-sale, Less than 12 Months, Quantity | security 0 0
Available-for-sale, 12 Months or Longer, Quantity | security 1 1