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SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Available for sale:    
Amortized Cost $ 524,529 $ 431,931
Gross Unrealized Gains 5,990 9,564
Gross Unrealized Losses (1,449) (56)
Estimated Fair Value 529,070 441,439
Held to maturity:    
Amortized Cost 210,735 169,153
Gross Unrealized Gains 3,733 3,155
Gross Unrealized Losses (766) (1,356)
Estimated Fair Value 213,702 170,952
Available for sale and held to maturity investment securities    
Amortized Cost 735,264 601,084
Gross Unrealized Gains 9,723 12,719
Gross Unrealized Losses (2,215) (1,412)
Total securities 742,772 612,391
U.S. GSE securities
   
Available for sale:    
Amortized Cost 178,421 130,708
Gross Unrealized Gains 377 968
Gross Unrealized Losses (346) (2)
Estimated Fair Value 178,452 131,674
Held to maturity:    
Amortized Cost 4,992  
Gross Unrealized Gains 24  
Estimated Fair Value 5,016  
State and municipal obligations
   
Available for sale:    
Amortized Cost 58,867 52,861
Gross Unrealized Gains 1,132 1,366
Gross Unrealized Losses (36) (8)
Estimated Fair Value 59,963 54,219
Held to maturity:    
Amortized Cost 98,752 104,314
Gross Unrealized Gains 2,241 2,048
Gross Unrealized Losses (31) (5)
Estimated Fair Value 100,962 106,357
U.S. GSE residential mortgage-backed securities
   
Available for sale:    
Amortized Cost 19,462 67,317
Gross Unrealized Gains 1,135 3,667
Estimated Fair Value 20,597 70,984
Held to maturity:    
Amortized Cost 9,483  
Gross Unrealized Gains 26  
Estimated Fair Value 9,509  
U.S. GSE residential collateralized mortgage obligations
   
Available for sale:    
Amortized Cost 224,226 175,878
Gross Unrealized Gains 2,762 3,493
Gross Unrealized Losses (542) (46)
Estimated Fair Value 226,446 179,325
Held to maturity:    
Amortized Cost 59,388 42,081
Gross Unrealized Gains 704 1,104
Gross Unrealized Losses (404) (21)
Estimated Fair Value 59,688 43,164
U.S. GSE commercial mortgage-backed securities
   
Available for sale:    
Amortized Cost 3,132  
Gross Unrealized Gains 6  
Estimated Fair Value 3,138  
Held to maturity:    
Amortized Cost 10,324  
Gross Unrealized Gains 350  
Estimated Fair Value 10,674  
U.S. GSE commercial collateralized mortgage obligations
   
Available for sale:    
Amortized Cost 9,079 5,167
Gross Unrealized Gains 278 70
Estimated Fair Value 9,357 5,237
Held to maturity:    
Amortized Cost 4,975  
Gross Unrealized Gains 254  
Estimated Fair Value 5,229  
Non Agency commercial mortgage-backed securities
   
Available for sale:    
Amortized Cost 4,754  
Gross Unrealized Gains 235  
Estimated Fair Value 4,989  
Other asset backed securities
   
Available for sale:    
Amortized Cost 26,588  
Gross Unrealized Gains 65  
Gross Unrealized Losses (525)  
Estimated Fair Value 26,128  
Corporate Bonds
   
Held to maturity:    
Amortized Cost 22,821 22,758
Gross Unrealized Gains 134 3
Gross Unrealized Losses (331) (1,330)
Estimated Fair Value $ 22,624 $ 21,431