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OTHER BORROWINGS (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Mar. 15, 2022
Jun. 30, 2017
Mar. 13, 2017
Dec. 31, 2016
Other borrowings   $ 679,591   $ 492,321
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds   560,300    
Credit arrangements for federal funds purchase   82,000    
Pledged Assets Separately Reported, Loans Pledged for Federal Reserve Bank, at Fair Value   989,900    
Line of Credit Facility, Remaining Borrowing Capacity   60,000    
Loans pledged at federal reserve discount window available for borrowing   $ 644,300    
Senior Subordinated Notes [Member]        
Debt Instrument, Face Amount     $ 75,000  
Debt Instrument, Interest Rate, Stated Percentage     5.75%  
Debt Instrument, Interest Rate Terms   The subordinated notes will mature on March 15, 2027 and through March 14, 2022 will bear a fixed rate of interest of 5.75% per annum, payable semi-annually in arrears on September 15 and March 15 of each year. Beginning March 15, 2022, the interest rate on the subordinated notes resets quarterly to a floating rate per annum equal to the then-current three-month LIBOR plus 3.616%, payable quarterly in arrears on June 15, September 15, December 15, and March 15 of each year to the maturity date or earlier redemption.    
Senior Subordinated Notes [Member] | Scenario, Forecast [Member]        
Debt Instrument, Redemption Price, Percentage 100.00%