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Investment Securities - Schedule of amortized cost and estimated fair value of Available for sale securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Available for sale    
Amortized Cost $ 4,289 $ 4,583
Gross Unrealized Gains 131 141
Gross Unrealized (Losses) (4) (7)
Estimated Fair Value 4,416 4,717
Carrying value 4,416 4,717
U.S. government agency MBS    
Available for sale    
Amortized Cost 2,612 2,823
Gross Unrealized Gains 114 120
Gross Unrealized (Losses)   0
Estimated Fair Value 2,726 2,943
Carrying value 2,726 2,943
U.S. government sponsored enterprise MBS    
Available for sale    
Amortized Cost 1,489 1,556
Gross Unrealized Gains 17 21
Gross Unrealized (Losses)   0
Estimated Fair Value 1,506 1,577
Carrying value 1,506 1,577
Private issue CMO    
Available for sale    
Amortized Cost 188 [1] 204
Gross Unrealized Gains   0
Gross Unrealized (Losses) (4) [1] (7)
Estimated Fair Value 184 [1] 197
Carrying value $ 184 [1] $ 197
[1] Collateralized Mortgage Obligations ("CMO").