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SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Available for sale:    
Amortized Cost $ 561,571 $ 524,529
Gross Unrealized Gains 2,689 5,990
Gross Unrealized Losses (13,310) (1,449)
Estimated Fair Value 550,950 529,070
Held to maturity:    
Amortized Cost 191,907 210,735
Gross Unrealized Gains 1,895 3,733
Gross Unrealized Losses (2,990) (766)
Estimated Fair Value 190,812 213,702
Available for sale and held to maturity investment securities    
Amortized Cost 753,478 735,264
Gross Unrealized Gains 4,584 9,723
Gross Unrealized Losses (16,300) (2,215)
Total securities 741,762 742,772
U.S. GSE securities
   
Available for sale:    
Amortized Cost 166,126 178,421
Gross Unrealized Gains 22 377
Gross Unrealized Losses (7,350) (346)
Estimated Fair Value 158,798 178,452
Held to maturity:    
Amortized Cost 7,439 4,992
Gross Unrealized Gains   24
Gross Unrealized Losses (154)  
Estimated Fair Value 7,285 5,016
State and municipal obligations
   
Available for sale:    
Amortized Cost 59,047 58,867
Gross Unrealized Gains 623 1,132
Gross Unrealized Losses (720) (36)
Estimated Fair Value 58,950 59,963
Held to maturity:    
Amortized Cost 61,954 98,752
Gross Unrealized Gains 1,038 2,241
Gross Unrealized Losses (131) (31)
Estimated Fair Value 62,861 100,962
U.S. GSE residential mortgage-backed securities
   
Available for sale:    
Amortized Cost 21,129 19,462
Gross Unrealized Gains 373 1,135
Gross Unrealized Losses (142)  
Estimated Fair Value 21,360 20,597
Held to maturity:    
Amortized Cost 8,632 9,483
Gross Unrealized Gains   26
Gross Unrealized Losses (266)  
Estimated Fair Value 8,366 9,509
U.S. GSE residential collateralized mortgage obligations
   
Available for sale:    
Amortized Cost 271,514 224,226
Gross Unrealized Gains 1,407 2,762
Gross Unrealized Losses (3,851) (542)
Estimated Fair Value 269,070 226,446
Held to maturity:    
Amortized Cost 71,839 59,388
Gross Unrealized Gains 578 704
Gross Unrealized Losses (1,904) (404)
Estimated Fair Value 70,513 59,688
U.S. GSE commercial mortgage-backed securities
   
Available for sale:    
Amortized Cost 3,104 3,132
Gross Unrealized Gains   6
Gross Unrealized Losses (99)  
Estimated Fair Value 3,005 3,138
Held to maturity:    
Amortized Cost 10,228 10,324
Gross Unrealized Gains 76 350
Gross Unrealized Losses (193)  
Estimated Fair Value 10,111 10,674
U.S. GSE commercial collateralized mortgage obligations
   
Available for sale:    
Amortized Cost 5,120 9,079
Gross Unrealized Gains 82 278
Estimated Fair Value 5,202 9,357
Held to maturity:    
Amortized Cost 8,962 4,975
Gross Unrealized Gains   254
Gross Unrealized Losses (314)  
Estimated Fair Value 8,648 5,229
Non Agency commercial mortgage-backed securities
   
Available for sale:    
Amortized Cost 4,402 4,754
Gross Unrealized Gains   235
Gross Unrealized Losses (143)  
Estimated Fair Value 4,259 4,989
Other Asset backed securities
   
Available for sale:    
Amortized Cost 31,129 26,588
Gross Unrealized Gains 182 65
Gross Unrealized Losses (1,005) (525)
Estimated Fair Value 30,306 26,128
Corporate Bonds
   
Held to maturity:    
Amortized Cost 22,853 22,821
Gross Unrealized Gains 203 134
Gross Unrealized Losses (28) (331)
Estimated Fair Value $ 23,028 $ 22,624