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Investment Securities: Marketable Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Held to maturity    
Amortized Cost $ 36,465 $ 27,890
Gross Unrealized Gains 1,476 1,942
Gross Unrealized Losses (103) (5)
Estimated Fair Value 37,838 29,827
Available for sale    
Estimated Fair Value 70,141 58,884
Mortgage-backed Securities, U.S. government agencies    
Held to maturity    
Amortized Cost 21,888 27,161
Gross Unrealized Gains 1,164 1,635
Gross Unrealized Losses (9) (3)
Estimated Fair Value 23,043 28,793
Available for sale    
Amortized Cost 69,001 57,797
Gross Unrealized Gains 282 178
Gross Unrealized Losses (99) (68)
Estimated Fair Value 69,184 57,907
Mortgage-backed Securities, Private label residential    
Held to maturity    
Amortized Cost 5,056 229
Gross Unrealized Gains 312 307
Gross Unrealized Losses (23) (1)
Estimated Fair Value 5,345 535
U.S. Treasury and U.S. government agency securities    
Held to maturity    
Amortized Cost 9,021 500
Gross Unrealized Gains 0 0
Gross Unrealized Losses (68) (1)
Estimated Fair Value 8,953 $ 499
Bank issued trust preferred securities    
Held to maturity    
Amortized Cost 500  
Gross Unrealized Gains 0  
Gross Unrealized Losses (3)  
Estimated Fair Value $ 497