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FAIR VALUE OF ASSETS AND LIABILITIES (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets and liabilities measured at fair value    
Available-for-sale, at fair value $ 1,304,891 $ 1,243,847
States and political subdivisions    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 179,781 185,041
Corporate securities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 74,278 99,389
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 25,510  
Commercial-U.S. Government agencies and sponsored entities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 39,725  
Commercial-U.S. Government sponsored entities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 137,326 137,224
Other    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 825 660
Recurring basis    
Assets and liabilities measured at fair value    
Total 1,304,877 1,243,989
Recurring basis | Derivatives - Interest rate contracts    
Assets and liabilities measured at fair value    
Derivatives (14) 142
Recurring basis | States and political subdivisions    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 179,781 185,041
Recurring basis | Corporate securities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 74,278 99,389
Recurring basis | U.S. Treasury obligations and direct obligations of U.S Government agencies    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 25,510 0
Recurring basis | Mortgage Backed Securities Residential U S Government Sponsored Entities [Member]    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 800,683  
Recurring basis | Non-agency collateralized mortgage-backed securities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 46,763 188,771
Recurring basis | Commercial-U.S. Government agencies and sponsored entities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 39,725 769,986
Recurring basis | Commercial-U.S. Government sponsored entities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 137,326  
Recurring basis | Other    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 825 660
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis    
Assets and liabilities measured at fair value    
Total 825 660
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | Derivatives - Interest rate contracts    
Assets and liabilities measured at fair value    
Derivatives 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | States and political subdivisions    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | Corporate securities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | U.S. Treasury obligations and direct obligations of U.S Government agencies    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | Other    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 825 660
Significant Other Observable Inputs (Level 2) | Recurring basis    
Assets and liabilities measured at fair value    
Total 1,292,258 1,231,133
Significant Other Observable Inputs (Level 2) | Recurring basis | Derivatives - Interest rate contracts    
Assets and liabilities measured at fair value    
Derivatives (14) 142
Significant Other Observable Inputs (Level 2) | Recurring basis | States and political subdivisions    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 167,987 172,845
Significant Other Observable Inputs (Level 2) | Recurring basis | Corporate securities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 74,278 99,389
Significant Other Observable Inputs (Level 2) | Recurring basis | U.S. Treasury obligations and direct obligations of U.S Government agencies    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 25,510 0
Significant Other Observable Inputs (Level 2) | Recurring basis | Mortgage Backed Securities Residential U S Government Sponsored Entities [Member]    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 800,683  
Significant Other Observable Inputs (Level 2) | Recurring basis | Non-agency collateralized mortgage-backed securities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 46,763 188,771
Significant Other Observable Inputs (Level 2) | Recurring basis | Commercial-U.S. Government agencies and sponsored entities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 39,725 769,986
Significant Other Observable Inputs (Level 2) | Recurring basis | Commercial-U.S. Government sponsored entities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 137,326  
Significant Unobservable Inputs (Level 3) | Recurring basis    
Assets and liabilities measured at fair value    
Total 11,794 12,196
Significant Unobservable Inputs (Level 3) | Recurring basis | Derivatives - Interest rate contracts    
Assets and liabilities measured at fair value    
Derivatives 0 0
Significant Unobservable Inputs (Level 3) | Recurring basis | States and political subdivisions    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 11,794 12,196
Significant Unobservable Inputs (Level 3) | Recurring basis | Corporate securities    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value 0 0
Significant Unobservable Inputs (Level 3) | Recurring basis | U.S. Treasury obligations and direct obligations of U.S Government agencies    
Assets and liabilities measured at fair value    
Available-for-sale, at fair value $ 0 $ 0