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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, 2019
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 5,321 $ 5,757
Gross Unrealized Gains 196 213
Gross Unrealized (Losses) 0 (1)
Estimated Fair Value 5,517 5,969
U.S. government agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,303 3,498
Gross Unrealized Gains 110 116
Gross Unrealized (Losses) 0 (1)
Estimated Fair Value 3,413 3,613
U.S. government sponsored enterprise MBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,773 1,998
Gross Unrealized Gains 78 89
Gross Unrealized (Losses) 0 0
Estimated Fair Value 1,851 2,087
Private issue CMO    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 245 [1] 261
Gross Unrealized Gains 8 [1] 8
Gross Unrealized (Losses) 0 [1] 0
Estimated Fair Value $ 253 [1] $ 269
[1] Collateralized Mortgage Obligations ("CMO").