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COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Loss Contingency, Estimate [Abstract]    
Contract amount of commitments and contingencies $ 1,181,652 $ 1,167,745
Unused lines of credit 25,000  
Federal Home Loan Bank unused borrowing capacity 1,800,000  
Federal Reserve unused borrowing capacity 25,100  
Federal Reserve required average total reserve 100,300  
Federal Reserve requirement represented by cash on hand 77,200  
Required deposit with Federal Reserve 23,100  
Minimum [Member]    
Loss Contingency, Estimate [Abstract]    
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability 0  
Maximum [Member]    
Loss Contingency, Estimate [Abstract]    
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability 1,000  
Commitments to Extend Credit [Member]    
Loss Contingency, Estimate [Abstract]    
Contract amount of commitments and contingencies 1,143,780 1,134,576
Standby Letters of Credit [Member]    
Loss Contingency, Estimate [Abstract]    
Contract amount of commitments and contingencies $ 37,872 $ 33,169