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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Commitments to extend credit    
FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK    
Financial instruments whose contract amounts represent credit risk   $ 825,304
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 825,304  
Standby letters of credit and financial guarantees written    
FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK    
Financial instruments whose contract amounts represent credit risk   16,073
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 16,073  
Interest rate options    
FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 2,494 879
Forward interest rate contracts    
FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 18,748 32,497
Interest rate lock commitments | Not Designated as Hedging Instrument [Member] | Interest rate options    
FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability   879
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Forward interest rate contracts    
FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability   $ 32,497
Reported Value Measurement [Member] | Commitments to extend credit    
FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability 917,405  
Reported Value Measurement [Member] | Standby letters of credit and financial guarantees written    
FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK    
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability $ 13,551