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BORROWINGS, SUBORDINATED NOTES AND DEBENTURES - NARRATIVE (Details)
1 Months Ended 12 Months Ended
Jan. 28, 2019
USD ($)
Dec. 13, 2004
USD ($)
Mar. 31, 2016
USD ($)
Jun. 30, 2020
USD ($)
bank
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Debt Instrument [Line Items]            
Borrowings, subordinated notes and debentures       $ 235,789,000 $ 168,929,000  
Proceeds from issuance of subordinated notes       0 7,400,000 $ 0
Borrowings from other banks            
Debt Instrument [Line Items]            
Maximum borrowing capacity       $ 35,000,000.0    
Federal funds lines of credit, number of banks | bank       2    
Credit line amount outstanding       $ 0 0  
Federal reserve bank advances            
Debt Instrument [Line Items]            
Short-term borrowings outstanding       0 0  
Maximum borrowing capacity       1,783,400,000 1,602,000,000.0  
Secured lines of credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity       230,000,000.0    
Borrowings, subordinated notes and debentures       $ 21,500,000    
Weighted average interest rate of borrowings (as percent)       1.58%    
Unsecured line of credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity       $ 50,000,000.0    
Borrowings, subordinated notes and debentures       0.0    
Paycheck protection program liquidity facility advances            
Debt Instrument [Line Items]            
Borrowings, subordinated notes and debentures       $ 152,000,000.0    
Borrowings interest rate (as percent)       0.35%    
Subordinated loans            
Debt Instrument [Line Items]            
Borrowings, subordinated notes and debentures       $ 7,400,000    
Debt issued principal amount $ 7,500,000          
Subordinated notes maturity (in months) 15 months          
Effective rate (as percent) 6.25%          
Repayment of subordinated loans         $ 100,000  
Subordinated notes            
Debt Instrument [Line Items]            
Debt issued principal amount     $ 51,000,000.0      
Effective rate (as percent)     6.25%      
Proceeds from issuance of subordinated notes     $ 51,000,000.0      
Debt issuance costs and discount (as percent)     3.15%      
Subordinated debentures            
Debt Instrument [Line Items]            
Effective rate (as percent)       2.76%    
Trust preferred securities   $ 5,000,000.0        
Borrowings, subordinated notes and debentures       $ 5,200,000    
Basis spread on variable rate (as percent)       2.40%    
Subordinated debentures | LIBOR            
Debt Instrument [Line Items]            
Description of variable rate basis       three-month LIBOR