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Investment Securities - Schedule of amortized cost and estimated fair value of Available for sale securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 4,746 $ 5,757
Gross Unrealized Gains 104 213
Gross Unrealized (Losses) (22) (1)
Estimated Fair Value 4,828 5,969
U.S. government agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,913 3,498
Gross Unrealized Gains 88 116
Gross Unrealized (Losses)   (1)
Estimated Fair Value 3,001 3,613
U.S. government sponsored enterprise MBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,614 1,998
Gross Unrealized Gains 16 89
Gross Unrealized (Losses)   0
Estimated Fair Value 1,630 2,087
Private issue CMO    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 219 [1] 261
Gross Unrealized Gains   8
Gross Unrealized (Losses) (22) [1] 0
Estimated Fair Value $ 197 [1] $ 269
[1] Collateralized Mortgage Obligations ("CMO").