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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Assets and liabilities measured at fair value    
Available for sale securities: $ 1,274,312 $ 1,229,018
States and political subdivisions debt securities    
Assets and liabilities measured at fair value    
Available for sale securities: 188,257 191,645
Corporate debt securities    
Assets and liabilities measured at fair value    
Available for sale securities: 99,562 100,604
Residential - U.S. Government sponsored entities    
Assets and liabilities measured at fair value    
Available for sale securities: 778,067 751,558
Residential - Non-government agencies    
Assets and liabilities measured at fair value    
Available for sale securities: 70,357 46,693
Commercial - Non-government agencies    
Assets and liabilities measured at fair value    
Available for sale securities: 137,151 137,641
Other    
Assets and liabilities measured at fair value    
Available for sale securities: 918 877
Recurring basis | Estimated Fair Value    
Assets and liabilities measured at fair value    
Available for sale securities: 1,274,312 1,229,018
Total 1,274,962 1,229,400
Recurring basis | Estimated Fair Value | Derivative - Interest Rate Contracts    
Assets and liabilities measured at fair value    
Derivatives: Interest rate contracts 650 382
Recurring basis | Estimated Fair Value | States and political subdivisions debt securities    
Assets and liabilities measured at fair value    
Available for sale securities: 188,257 191,645
Recurring basis | Estimated Fair Value | Corporate debt securities    
Assets and liabilities measured at fair value    
Available for sale securities: 99,562 100,604
Recurring basis | Estimated Fair Value | Residential - U.S. Government sponsored entities    
Assets and liabilities measured at fair value    
Available for sale securities: 778,067 751,558
Recurring basis | Estimated Fair Value | Residential - Non-government agencies    
Assets and liabilities measured at fair value    
Available for sale securities: 70,357 46,693
Recurring basis | Estimated Fair Value | Commercial - Non-government agencies    
Assets and liabilities measured at fair value    
Available for sale securities: 137,151 137,641
Recurring basis | Estimated Fair Value | Other    
Assets and liabilities measured at fair value    
Available for sale securities: 918 877
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets and liabilities measured at fair value    
Available for sale securities: 918 877
Total 918 877
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other    
Assets and liabilities measured at fair value    
Available for sale securities: 918 877
Recurring basis | Significant Other Observable Inputs (Level 2)    
Assets and liabilities measured at fair value    
Available for sale securities: 1,260,766 1,215,046
Total 1,261,416 1,215,428
Recurring basis | Significant Other Observable Inputs (Level 2) | Derivative - Interest Rate Contracts    
Assets and liabilities measured at fair value    
Derivatives: Interest rate contracts 650 382
Recurring basis | Significant Other Observable Inputs (Level 2) | States and political subdivisions debt securities    
Assets and liabilities measured at fair value    
Available for sale securities: 175,629 178,550
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities    
Assets and liabilities measured at fair value    
Available for sale securities: 99,562 100,604
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential - U.S. Government sponsored entities    
Assets and liabilities measured at fair value    
Available for sale securities: 778,067 751,558
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential - Non-government agencies    
Assets and liabilities measured at fair value    
Available for sale securities: 70,357 46,693
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial - Non-government agencies    
Assets and liabilities measured at fair value    
Available for sale securities: 137,151 137,641
Recurring basis | Significant Unobservable Inputs (Level 3)    
Assets and liabilities measured at fair value    
Available for sale securities: 12,628 13,095
Total 12,628 13,095
Recurring basis | Significant Unobservable Inputs (Level 3) | States and political subdivisions debt securities    
Assets and liabilities measured at fair value    
Available for sale securities: $ 12,628 $ 13,095