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COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract amount of commitments and contingencies $ 796,098 $ 830,495
Unused lines of credit 25,000  
Federal Home Loan Bank unused borrowing capacity 1,200,000  
Federal Reserve unused borrowing capacity 26,000  
Federal Reserve required average total reserve 82,800  
Federal Reserve requirement represented by cash on hand 64,900  
Required deposit with Federal Reserve 17,900  
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 773,442 811,442
Standby Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contract amount of commitments and contingencies $ 22,656 $ 19,053