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FAIR VALUE DISCLOSURES (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Available-for-sale securities [Abstract]        
Mortgage servicing rights $ 49,001 $ 37,882 $ 34,167 $ 30,174
Minimum [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative interest rate 1.55%      
Maximum [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative interest rate 3.70%      
Fair Value, Measurements, Recurring [Member]
       
Available-for-sale securities [Abstract]        
U.S. Government agencies 1,581,570   1,481,060  
Government agency issued residential mortgage-backed securities 292,586   360,489  
Government agency issued commercial mortgage-backed securities 227,381   35,895  
Obligations of states and political subdivisions 535,337   577,629  
Other 8,065   7,758  
Mortgage servicing rights 49,001   34,167  
Derivative instruments 43,337   59,389  
Total 2,737,277   2,556,387  
Liabilities [Abstract]        
Derivative instruments 36,474   56,567  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
       
Available-for-sale securities [Abstract]        
Other 955   673  
Total 955   673  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
       
Available-for-sale securities [Abstract]        
U.S. Government agencies 1,581,570   1,481,060  
Government agency issued residential mortgage-backed securities 292,586   360,489  
Government agency issued commercial mortgage-backed securities 227,381   35,895  
Obligations of states and political subdivisions 535,337   577,629  
Other 7,110   7,085  
Total 2,643,984   2,462,158  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
       
Available-for-sale securities [Abstract]        
Mortgage servicing rights 49,001   34,167  
Derivative instruments 43,337   59,389  
Total 92,338   93,556  
Liabilities [Abstract]        
Derivative instruments $ 36,474   $ 56,567