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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, 2016
Dec. 31, 2015
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 $ 166,927 $ 157,907
Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative interest rate 2.10%  
Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative interest rate 4.40%  
Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities [Abstract]    
U.S. Government agencies $ 1,789,427 1,244,640
Government agency issued residential mortgage-backed securities 176,243 140,540
Government agency issued commercial mortgage-backed securities 172,279 260,693
Obligations of states and political subdivisions 360,005 417,499
Other 33,722 18,957
Mortgage servicing rights 65,263 57,268
Derivative instruments 15,761 19,508
Loans held for sale, at fair value 166,927 157,907
Total 2,779,627 2,317,012
Liabilities [Abstract]    
Derivative instruments 9,623 16,251
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Available-for-sale securities [Abstract]    
Other 1,218 776
Total 1,218 776
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Available-for-sale securities [Abstract]    
U.S. Government agencies 1,789,427 1,244,640
Government agency issued residential mortgage-backed securities 176,243 140,540
Government agency issued commercial mortgage-backed securities 172,279 260,693
Obligations of states and political subdivisions 360,005 417,499
Other 32,504 18,181
Loans held for sale, at fair value 166,927 157,907
Total 2,697,385 2,239,460
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Available-for-sale securities [Abstract]    
Mortgage servicing rights 65,263 57,268
Derivative instruments 15,761 19,508
Total 81,024 76,776
Liabilities [Abstract]    
Derivative instruments $ 9,623 $ 16,251