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Fair Value Measurements - Fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
State and political subdivisions    
Fair value measurement, recurring basis $ 48,474 $ 41,988
Other securities    
Fair value measurement, recurring basis 15,309 7,624
Mortgage-backed securities    
Fair value measurement, recurring basis 117,363 126,912
Fair Value, Inputs, Level 1 | State and political subdivisions    
Fair value measurement, recurring basis 0 0
Fair Value, Inputs, Level 1 | Other securities    
Fair value measurement, recurring basis 0 0
Fair Value, Inputs, Level 1 | Mortgage-backed securities    
Fair value measurement, recurring basis 0 0
Fair Value, Inputs, Level 2 | State and political subdivisions    
Fair value measurement, recurring basis 48,474 41,988
Fair Value, Inputs, Level 2 | Other securities    
Fair value measurement, recurring basis 15,309 7,624
Fair Value, Inputs, Level 2 | Mortgage-backed securities    
Fair value measurement, recurring basis 117,363 126,912
Fair Value, Inputs, Level 3 | State and political subdivisions    
Fair value measurement, recurring basis 0 0
Fair Value, Inputs, Level 3 | Other securities    
Fair value measurement, recurring basis 0 0
Fair Value, Inputs, Level 3 | Mortgage-backed securities    
Fair value measurement, recurring basis $ 0 $ 0