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Debt Securities - Available for Sale Securities Continuous Unrealized Loss Position Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value $ 124,576 $ 156,459 [1]
Less than 12 Months, Fair Value 37,480 40,048
12 Months or Longer, Fair Value 1,171 1,205
Total, Fair Value 38,651 41,253
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract] (Deprecated 2018-01-31)    
12 Months or More, Fair Value (188) (192)
12 Months or More, Unrealized Losses (24) (26)
Total, Unrealized Losses (212) (218)
U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 19,101 19,073
Less than 12 Months, Fair Value 4,999 14,963
12 Months or Longer, Fair Value 0 0
Total, Fair Value 4,999 14,963
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract] (Deprecated 2018-01-31)    
12 Months or More, Fair Value (1) (37)
12 Months or More, Unrealized Losses 0 0
Total, Unrealized Losses (1) (37)
Residential MBS of U.S. government agencies and GSEs    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 41,458 43,404
Less than 12 Months, Fair Value 8,616 5,212
12 Months or Longer, Fair Value 1,171 1,205
Total, Fair Value 9,787 6,417
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract] (Deprecated 2018-01-31)    
12 Months or More, Fair Value (52) (28)
12 Months or More, Unrealized Losses (24) (26)
Total, Unrealized Losses (76) (54)
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value 56,181 84,431
Less than 12 Months, Fair Value 23,865 19,873
12 Months or Longer, Fair Value 0 0
Total, Fair Value 23,865 19,873
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract] (Deprecated 2018-01-31)    
12 Months or More, Fair Value (135) (127)
12 Months or More, Unrealized Losses 0 0
Total, Unrealized Losses (135) (127)
Collateral Pledged    
Debt Securities, Available-for-sale [Line Items]    
Estimated Fair Value $ 92,083 $ 97,603
[1] Derived from audited financial statements.