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Investment Securities: Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Held to Maturity    
Amortized Cost $ 27,890 $ 31,102
Gross Unrealized Gains 1,942 1,489
Gross Unrealized Losses (5) (11)
Estimated Fair Value 29,827 32,580
Available for Sale    
Amortized Cost   22,418
Gross Unrealized Gains   114
Gross Unrealized Losses   0
Estimated Fair Value   22,532
Mortgage-backed Securities, U.S. government agencies    
Held to Maturity    
Amortized Cost 27,161 27,786
Gross Unrealized Gains 1,635 999
Gross Unrealized Losses (3) (2)
Estimated Fair Value 28,793 28,783
Available for Sale    
Amortized Cost 57,797 22,418
Gross Unrealized Gains 178 114
Gross Unrealized Losses (68) 0
Estimated Fair Value 57,907 22,532
Mortgage-backed Securities, Private label residential    
Held to Maturity    
Amortized Cost 229 317
Gross Unrealized Gains 307 490
Gross Unrealized Losses (1) (1)
Estimated Fair Value 535 806
U.S. agency securities    
Held to Maturity    
Amortized Cost   2,999
Gross Unrealized Gains   0
Gross Unrealized Losses   (8)
Estimated Fair Value   $ 2,991
Bank issued trust preferred securities    
Held to Maturity    
Amortized Cost 500  
Gross Unrealized Gains 0  
Gross Unrealized Losses (1)  
Estimated Fair Value $ 499