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Fair Value of Financial Instruments (Narrative) (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
security
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Gains or losses included in earnings attributable to the change in realized/unrealized gains or losses related to the assets $ 0 $ 0      
Fair value, assets, level 1 to level 2 transfers, amount     $ 0 $ 0  
Fair value, assets, level 2 to level 1 transfer, amount $ 0 $ 0     $ 0
Collateralized debt obligations [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Acquired trust preferred securities, number of securities | security 9        
Collateralized debt obligations [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Trust preferred securities, amortized cost $ 18,600,000        
Trust preferred securities, fair value $ 13,600,000