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FAIR VALUE DISCLOSURES (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
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]        
Mortgage servicing rights $ 55,924 $ 51,296 $ 52,272 $ 54,662
Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative interest rate 1.50%      
Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative interest rate 5.80%      
Carrying Value [Member]        
Available-for-sale securities [Abstract]        
Loans held for sale $ 199,370 141,015    
Fair Value [Member]        
Available-for-sale securities [Abstract]        
Loans held for sale 199,370 $ 141,015    
Fair Value, Measurements, Recurring [Member]        
Available-for-sale securities [Abstract]        
U.S. Government agencies 1,336,846   1,333,368  
Government agency issued residential mortgage-backed securities 217,191   229,414  
Government agency issued commercial mortgage-backed securities 224,450   237,321  
Obligations of states and political subdivisions 458,322   520,897  
Other 14,344   11,192  
Mortgage servicing rights 55,924   52,272  
Derivative instruments 25,307   29,625  
Loans held for sale 199,370   105,643  
Total 2,531,754   2,519,732  
Liabilities [Abstract]        
Derivative instruments 18,869   27,593  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]        
Available-for-sale securities [Abstract]        
Other 1,160   1,090  
Total 1,160   1,090  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]        
Available-for-sale securities [Abstract]        
U.S. Government agencies 1,336,846   1,333,368  
Government agency issued residential mortgage-backed securities 217,191   229,414  
Government agency issued commercial mortgage-backed securities 224,450   237,321  
Obligations of states and political subdivisions 458,322   520,897  
Other 13,184   10,102  
Loans held for sale 199,370   105,643  
Total 2,449,363   2,436,745  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]        
Available-for-sale securities [Abstract]        
Mortgage servicing rights 55,924   52,272  
Derivative instruments 25,307   29,625  
Total 81,231   81,897  
Liabilities [Abstract]        
Derivative instruments $ 18,869   $ 27,593