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SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Available for sale:    
Amortized Cost $ 502,995 $ 524,529
Gross Unrealized Gains 1,664 5,990
Gross Unrealized Losses (15,995) (1,449)
Estimated Fair Value 488,664 529,070
Held to maturity:    
Amortized Cost 197,622 210,735
Gross Unrealized Gains 1,827 3,733
Gross Unrealized Losses (4,034) (766)
Estimated Fair Value 195,415 213,702
Available for sale and held to maturity investment securities    
Amortized Cost 700,617 735,264
Gross Unrealized Gains 3,491 9,723
Gross Unrealized Losses (20,029) (2,215)
Total securities 684,079 742,772
U.S. GSE securities
   
Available for sale:    
Amortized Cost 157,086 178,421
Gross Unrealized Gains 19 377
Gross Unrealized Losses (8,481) (346)
Estimated Fair Value 148,624 178,452
Held to maturity:    
Amortized Cost 7,442 4,992
Gross Unrealized Gains   24
Gross Unrealized Losses (131)  
Estimated Fair Value 7,311 5,016
State and municipal obligations
   
Available for sale:    
Amortized Cost 56,532 58,867
Gross Unrealized Gains 613 1,132
Gross Unrealized Losses (803) (36)
Estimated Fair Value 56,342 59,963
Held to maturity:    
Amortized Cost 64,451 98,752
Gross Unrealized Gains 1,067 2,241
Gross Unrealized Losses (149) (31)
Estimated Fair Value 65,369 100,962
U.S. GSE residential mortgage-backed securities
   
Available for sale:    
Amortized Cost 15,318 19,462
Gross Unrealized Gains 112 1,135
Gross Unrealized Losses (129)  
Estimated Fair Value 15,301 20,597
Held to maturity:    
Amortized Cost 8,222 9,483
Gross Unrealized Gains   26
Gross Unrealized Losses (212)  
Estimated Fair Value 8,010 9,509
U.S. GSE residential collateralized mortgage obligations
   
Available for sale:    
Amortized Cost 228,834 224,226
Gross Unrealized Gains 806 2,762
Gross Unrealized Losses (4,994) (542)
Estimated Fair Value 224,646 226,446
Held to maturity:    
Amortized Cost 70,842 59,388
Gross Unrealized Gains 567 704
Gross Unrealized Losses (2,708) (404)
Estimated Fair Value 68,701 59,688
U.S. GSE commercial mortgage-backed securities
   
Available for sale:    
Amortized Cost 3,090 3,132
Gross Unrealized Gains   6
Gross Unrealized Losses (108)  
Estimated Fair Value 2,982 3,138
Held to maturity:    
Amortized Cost 10,181 10,324
Gross Unrealized Gains   350
Gross Unrealized Losses (302)  
Estimated Fair Value 9,879 10,674
U.S. GSE commercial collateralized mortgage obligations
   
Available for sale:    
Amortized Cost 5,114 9,079
Gross Unrealized Gains 54 278
Estimated Fair Value 5,168 9,357
Held to maturity:    
Amortized Cost 13,615 4,975
Gross Unrealized Gains 37 254
Gross Unrealized Losses (470)  
Estimated Fair Value 13,182 5,229
Non Agency commercial mortgage-backed securities
   
Available for sale:    
Amortized Cost 3,749 4,754
Gross Unrealized Gains   235
Gross Unrealized Losses (105)  
Estimated Fair Value 3,644 4,989
Other Asset backed securities
   
Available for sale:    
Amortized Cost 33,272 26,588
Gross Unrealized Gains 60 65
Gross Unrealized Losses (1,375) (525)
Estimated Fair Value 31,957 26,128
Corporate Bonds
   
Held to maturity:    
Amortized Cost 22,869 22,821
Gross Unrealized Gains 156 134
Gross Unrealized Losses (62) (331)
Estimated Fair Value $ 22,963 $ 22,624