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SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Available for sale:    
Amortized Cost $ 442,618 $ 431,931
Gross Unrealized Gains 7,405 9,564
Gross Unrealized Losses (530) (56)
Estimated Fair Value 449,493 441,439
Held to maturity:    
Amortized Cost 177,922 169,153
Gross Unrealized Gains 3,368 3,155
Gross Unrealized Losses (946) (1,356)
Estimated Fair Value 180,344 170,952
Available for sale and held to maturity investment securities    
Amortized Cost 620,540 601,084
Gross Unrealized Gains 10,773 12,719
Gross Unrealized Losses (1,476) (1,412)
Total securities 629,837 612,391
U.S. GSE securities
   
Available for sale:    
Amortized Cost 108,856 130,708
Gross Unrealized Gains 1,054 968
Gross Unrealized Losses   (2)
Estimated Fair Value 109,910 131,674
Held to maturity:    
Amortized Cost 10,491  
Gross Unrealized Gains 41  
Estimated Fair Value 10,532  
State and municipal obligations
   
Available for sale:    
Amortized Cost 62,549 52,861
Gross Unrealized Gains 1,390 1,366
Gross Unrealized Losses (70) (8)
Estimated Fair Value 63,869 54,219
Held to maturity:    
Amortized Cost 96,416 104,314
Gross Unrealized Gains 2,004 2,048
Gross Unrealized Losses (31) (5)
Estimated Fair Value 98,389 106,357
U.S. GSE residential mortgage-backed securities
   
Available for sale:    
Amortized Cost 29,907 67,317
Gross Unrealized Gains 2,007 3,667
Estimated Fair Value 31,914 70,984
U.S. GSE residential collateralized mortgage obligations
   
Available for sale:    
Amortized Cost 219,099 175,878
Gross Unrealized Gains 2,729 3,493
Gross Unrealized Losses (289) (46)
Estimated Fair Value 221,539 179,325
Held to maturity:    
Amortized Cost 37,299 42,081
Gross Unrealized Gains 856 1,104
Gross Unrealized Losses (10) (21)
Estimated Fair Value 38,145 43,164
U.S. GSE commercial collateralized mortgage obligations
   
Available for sale:    
Amortized Cost 9,159 5,167
Gross Unrealized Gains 225 70
Estimated Fair Value 9,384 5,237
Held to maturity:    
Amortized Cost 4,974  
Gross Unrealized Gains 212  
Estimated Fair Value 5,186  
Non Agency commercial mortgage-backed securities
   
Available for sale:    
Amortized Cost 5,069  
Gross Unrealized Losses (7)  
Estimated Fair Value 5,062  
Other Asset backed securities
   
Available for sale:    
Amortized Cost 7,979  
Gross Unrealized Losses (164)  
Estimated Fair Value 7,815  
U.S. GSE commercial mortgage-backed securities
   
Held to maturity:    
Amortized Cost 5,953  
Gross Unrealized Gains 148  
Estimated Fair Value 6,101  
Corporate Bonds
   
Held to maturity:    
Amortized Cost 22,789 22,758
Gross Unrealized Gains 107 3
Gross Unrealized Losses (905) (1,330)
Estimated Fair Value $ 21,991 $ 21,431