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FAIR VALUE DISCLOSURES (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage rate deduction to determine the fair value of other real estate owned (in hundredths) 7.00%  
Available-for-sale securities [Abstract]    
Loans held for sale, at fair value $ 157,907 $ 141,015
Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative interest rate 1.80%  
Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative interest rate 4.00%  
Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities [Abstract]    
U.S. Government agencies $ 1,244,640 1,215,054
Government agency issued residential mortgage-backed securities 140,540 209,230
Government agency issued commercial mortgage-backed securities 260,693 240,568
Obligations of states and political subdivisions 417,499 483,864
Other 18,957 8,211
Mortgage servicing rights 57,268 51,296
Derivative instruments 19,508 23,830
Loans held for sale, at fair value 157,907 141,015
Total 2,317,012 2,373,068
Liabilities [Abstract]    
Derivative instruments 16,251 23,207
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Available-for-sale securities [Abstract]    
Other 776 1,302
Total 776 1,302
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Available-for-sale securities [Abstract]    
U.S. Government agencies 1,244,640 1,215,054
Government agency issued residential mortgage-backed securities 140,540 209,230
Government agency issued commercial mortgage-backed securities 260,693 240,568
Obligations of states and political subdivisions 417,499 483,864
Other 18,181 6,909
Loans held for sale, at fair value 157,907 141,015
Total 2,239,460 2,296,640
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Available-for-sale securities [Abstract]    
Mortgage servicing rights 57,268 51,296
Derivative instruments 19,508 23,830
Total 76,776 75,126
Liabilities [Abstract]    
Derivative instruments $ 16,251 $ 23,207