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COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract amount of commitments and contingencies $ 1,103,786 $ 796,098
Unused lines of credit 25,000  
Federal Home Loan Bank unused borrowing capacity 1,680,000  
Federal Reserve unused borrowing capacity 22,900  
Federal Reserve required average total reserve 84,800  
Federal Reserve requirement represented by cash on hand 73,200  
Required deposit with Federal Reserve 11,600  
Minimum [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability 0  
Maximum [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability 1,000  
Commitments to Extend Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract amount of commitments and contingencies 1,080,004 773,442
Standby Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract amount of commitments and contingencies $ 23,782 $ 22,656