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OTHER BORROWINGS - Narrative (Details) - USD ($)
9 Months Ended
Mar. 15, 2022
Mar. 15, 2022
Sep. 30, 2018
Dec. 31, 2017
Mar. 13, 2017
Debt Instrument [Line Items]          
Federal home loan bank, advances, general debt obligations, amount of available, unused funds     $ 1,500,000,000    
Credit arrangements for federal funds purchase     117,000,000    
Pledged assets separately reported, loans pledged for federal reserve bank, at fair value     1,300,000,000    
Loans pledged at federal reserve discount window available for borrowing     859,300,000    
Senior Subordinated Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount         $ 75,000,000.0
Debt instrument, interest rate, stated percentage         5.75%
Senior Subordinated Notes | Scenario, Forecast          
Debt Instrument [Line Items]          
Debt instrument, redemption price, percentage 100.00% 100.00%      
Senior Subordinated Notes | London Interbank Offered Rate (LIBOR) | Scenario, Forecast          
Debt Instrument [Line Items]          
Basis spread on variable rate   3.616%      
Advances under revolving credit agreement with a regional bank due September 26, 2020; secured by subsidiary bank stock; variable interest rate at 90-day LIBOR plus 3.50% (5.82% at September 30, 2018)          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity     $ 100,000,000.0    
Basis spread on variable rate     3.50%    
Principal amount outstanding     $ 70,000,000 $ 0  
Line of credit facility, remaining borrowing capacity     $ 30,000,000