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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, 2016
Dec. 31, 2015
Assets and liabilities measured at fair value    
Available for sale, at fair value $ 1,243,847 $ 1,272,255
States and political subdivisions    
Assets and liabilities measured at fair value    
Available for sale, at fair value 185,041 190,473
Corporate securities    
Assets and liabilities measured at fair value    
Available for sale, at fair value 99,389 108,571
Other    
Assets and liabilities measured at fair value    
Available for sale, at fair value 660 916
Recurring basis    
Assets and liabilities measured at fair value    
Total 1,243,989 1,272,314
Recurring basis | Derivatives - Interest rate contracts    
Assets and liabilities measured at fair value    
Derivatives 142 59
Recurring basis | States and political subdivisions    
Assets and liabilities measured at fair value    
Available for sale, at fair value 185,041 190,473
Recurring basis | Corporate securities    
Assets and liabilities measured at fair value    
Available for sale, at fair value 99,389 108,571
Recurring basis | Mortgage-backed securities:    
Assets and liabilities measured at fair value    
Available for sale, at fair value 769,986 771,909
Recurring basis | Non-agency collateralized mortgage-backed securities    
Assets and liabilities measured at fair value    
Available for sale, at fair value 188,771 200,386
Recurring basis | Other    
Assets and liabilities measured at fair value    
Available for sale, at fair value 660 916
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis    
Assets and liabilities measured at fair value    
Total 660 916
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 660 916
Significant Other Observable Inputs (Level 2) | Recurring basis    
Assets and liabilities measured at fair value    
Total 1,231,133 1,258,919
Significant Other Observable Inputs (Level 2) | Recurring basis | Derivatives - Interest rate contracts    
Assets and liabilities measured at fair value    
Derivatives 142 59
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 172,845 177,994
Significant Other Observable Inputs (Level 2) | Recurring basis | Corporate securities    
Assets and liabilities measured at fair value    
Available for sale, at fair value 99,389 108,571
Significant Other Observable Inputs (Level 2) | Recurring basis | Mortgage-backed securities:    
Assets and liabilities measured at fair value    
Available for sale, at fair value 769,986 771,909
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 188,771 200,386
Significant Unobservable Inputs (Level 3) | Recurring basis    
Assets and liabilities measured at fair value    
Total 12,196 12,479
Significant Unobservable Inputs (Level 3) | Recurring basis | States and political subdivisions    
Assets and liabilities measured at fair value    
Available for sale, at fair value $ 12,196 $ 12,479