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SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available for sale:    
Amortized Cost $ 554,066 $ 431,931
Gross Unrealized Gains 7,588 9,564
Gross Unrealized Losses (864) (56)
Estimated Fair Value 560,790 441,439
Held to maturity:    
Amortized Cost 212,879 169,153
Gross Unrealized Gains 4,101 3,155
Gross Unrealized Losses (897) (1,356)
Estimated Fair Value 216,083 170,952
Available for sale and held to maturity investment securities    
Amortized Cost 766,945 601,084
Gross Unrealized Gains 11,689 12,719
Gross Unrealized Losses (1,761) (1,412)
Total securities 776,873 612,391
U.S. GSE securities
   
Available for sale:    
Amortized Cost 150,215 130,708
Gross Unrealized Gains 1,249 968
Gross Unrealized Losses (53) (2)
Estimated Fair Value 151,411 131,674
Held to maturity:    
Amortized Cost 4,992  
Gross Unrealized Gains 47  
Estimated Fair Value 5,039  
State and municipal obligations
   
Available for sale:    
Amortized Cost 69,250 52,861
Gross Unrealized Gains 1,390 1,366
Gross Unrealized Losses (27) (8)
Estimated Fair Value 70,613 54,219
Held to maturity:    
Amortized Cost 98,685 104,314
Gross Unrealized Gains 2,433 2,048
Gross Unrealized Losses (39) (5)
Estimated Fair Value 101,079 106,357
U.S. GSE residential mortgage-backed securities
   
Available for sale:    
Amortized Cost 24,107 67,317
Gross Unrealized Gains 1,733 3,667
Estimated Fair Value 25,840 70,984
Held to maturity:    
Amortized Cost 9,899  
Gross Unrealized Gains 47  
Estimated Fair Value 9,946  
U.S. GSE residential collateralized mortgage obligations
   
Available for sale:    
Amortized Cost 275,668 175,878
Gross Unrealized Gains 2,847 3,493
Gross Unrealized Losses (626) (46)
Estimated Fair Value 277,889 179,325
Held to maturity:    
Amortized Cost 61,152 42,081
Gross Unrealized Gains 848 1,104
Gross Unrealized Losses (278) (21)
Estimated Fair Value 61,722 43,164
U.S. GSE commercial collateralized mortgage obligations
   
Available for sale:    
Amortized Cost 9,132 5,167
Gross Unrealized Gains 307 70
Estimated Fair Value 9,439 5,237
Held to maturity:    
Amortized Cost 4,975  
Gross Unrealized Gains 220  
Estimated Fair Value 5,195  
Non Agency commercial mortgage-backed securities
   
Available for sale:    
Amortized Cost 4,960  
Gross Unrealized Gains 48  
Estimated Fair Value 5,008  
Other Asset backed securities
   
Available for sale:    
Amortized Cost 20,734  
Gross Unrealized Gains 14  
Gross Unrealized Losses (158)  
Estimated Fair Value 20,590  
U.S. GSE commercial mortgage-backed securities
   
Held to maturity:    
Amortized Cost 10,371  
Gross Unrealized Gains 369  
Estimated Fair Value 10,740  
Corporate Bonds
   
Held to maturity:    
Amortized Cost 22,805 22,758
Gross Unrealized Gains 137 3
Gross Unrealized Losses (580) (1,330)
Estimated Fair Value $ 22,362 $ 21,431