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INVESTMENT SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Held to Maturity    
Amortized cost $ 252,047 $ 161,848
Estimated fair value 238,705 162,528
Available for Sale    
Amortized cost 1,433,296 1,514,005
Gross unrealized gains 9,469 25,520
Gross unrealized losses (34,766) (2,780)
Total 1,407,999 1,536,745
U.S. Government sponsored entities debt securities
   
Available for Sale    
Amortized cost   278,198
Gross unrealized gains   2,741
Total   280,939
States and political subdivisions debt securities
   
Available for Sale    
Amortized cost 191,158 184,274
Gross unrealized gains 305 2,831
Gross unrealized losses (12,106) (1,194)
Total 179,357 185,911
Corporations debt securities
   
Available for Sale    
Amortized cost 157,337 125,649
Gross unrealized gains 1,878 2,360
Gross unrealized losses (1,120) (63)
Total 158,095 127,946
U.S. Government sponsored entities mortgage-backed securities
   
Held to Maturity    
Amortized cost 252,047 161,848
Gross unrealized gains   695
Gross unrealized losses (13,342) (15)
Estimated fair value 238,705 162,528
Available for Sale    
Amortized cost 936,144 925,018
Gross unrealized gains 7,085 17,548
Gross unrealized losses (15,603) (1,523)
Total 927,626 941,043
Non-agency collateralized mortgage obligations mortgage-backed securities
   
Available for Sale    
Amortized cost 147,902  
Gross unrealized gains 81  
Gross unrealized losses (5,937)  
Total 142,046  
Other
   
Available for Sale    
Amortized cost 755 866
Gross unrealized gains 120 40
Total $ 875 $ 906