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Investment Securities: Unrealized Gain (Loss) on Investments (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
USD ($)
security
Sep. 30, 2016
USD ($)
security
Held-to-maturity Securities, Fair Value:    
Estimated Fair Value - Less Than 12 Months $ 2,984 $ 10
Estimated Fair Value - 12 Months or Longer 199 208
Total Estimated Fair Value 3,183 218
Held-to-maturity Securities, Gross Unrealized Losses    
Gross Unrealized Losses - Less Than 12 Months (9) 0
Gross Unrealized Losses - 12 Months or Longer (3) (3)
Total Gross Unrealized Losses $ (12) $ (3)
Held-to-maturity, Qty, Less Than 12 Months | security 1 2
Held-to-maturity, Qty, 12 Months or Longer | security 16 15
Available-for-sale Securities, Fair Value:    
Estimated Fair Value - Less Than 12 Months $ 0 $ 0
Estimated Fair Value - 12 Months or Longer 952 976
Total Estimated Fair Value 952 976
Available-for-sale Securities, Gross Unrealized Losses:    
Gross Unrealized Losses - Less Than 12 Months 0 0
Gross Unrealized Losses - 12 Months or Longer (48) (24)
Total Gross Unrealized Losses $ (48) $ (24)
Available-for-sale, Qty, Less than 12 Months | security 0 0
Available-for-sale, Qty, 12 Months or Longer | security 1 1
Mortgage-backed Securities, U.S. government agencies    
Held-to-maturity Securities, Fair Value:    
Estimated Fair Value - Less Than 12 Months $ 0 $ 9
Estimated Fair Value - 12 Months or Longer 114 96
Total Estimated Fair Value 114 105
Held-to-maturity Securities, Gross Unrealized Losses    
Gross Unrealized Losses - Less Than 12 Months 0 0
Gross Unrealized Losses - 12 Months or Longer (1) (1)
Total Gross Unrealized Losses $ (1) $ (1)
Held-to-maturity, Qty, Less Than 12 Months | security 0 1
Held-to-maturity, Qty, 12 Months or Longer | security 6 5
Mortgage-backed Securities, Private label residential    
Held-to-maturity Securities, Fair Value:    
Estimated Fair Value - Less Than 12 Months $ 0 $ 1
Estimated Fair Value - 12 Months or Longer 85 112
Total Estimated Fair Value 85 113
Held-to-maturity Securities, Gross Unrealized Losses    
Gross Unrealized Losses - Less Than 12 Months 0 0
Gross Unrealized Losses - 12 Months or Longer (2) (2)
Total Gross Unrealized Losses $ (2) $ (2)
Held-to-maturity, Qty, Less Than 12 Months | security 0 1
Held-to-maturity, Qty, 12 Months or Longer | security 10 10
US Government Agencies Debt Securities    
Held-to-maturity Securities, Fair Value:    
Estimated Fair Value - Less Than 12 Months $ 2,984  
Estimated Fair Value - 12 Months or Longer 0  
Total Estimated Fair Value 2,984  
Held-to-maturity Securities, Gross Unrealized Losses    
Gross Unrealized Losses - Less Than 12 Months (9)  
Gross Unrealized Losses - 12 Months or Longer 0  
Total Gross Unrealized Losses $ (9)  
Held-to-maturity, Qty, Less Than 12 Months | security 1  
Held-to-maturity, Qty, 12 Months or Longer | security 0  
Mutual funds    
Available-for-sale Securities, Fair Value:    
Estimated Fair Value - Less Than 12 Months $ 0 $ 0
Estimated Fair Value - 12 Months or Longer 952 976
Total Estimated Fair Value 952 976
Available-for-sale Securities, Gross Unrealized Losses:    
Gross Unrealized Losses - Less Than 12 Months 0 0
Gross Unrealized Losses - 12 Months or Longer (48) (24)
Total Gross Unrealized Losses $ (48) $ (24)
Available-for-sale, Qty, Less than 12 Months | security 0 0
Available-for-sale, Qty, 12 Months or Longer | security 1 1