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SECURITIES AVAILABLE FOR SALE AND HELD TO MATURITY (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Securities available for sale:    
Amortized Cost $ 1,072,829 $ 769,342
Gross Unrealized Gains 15,847 8,005
Gross Unrealized Losses (8,008) (17,299)
Fair Value 1,080,668 760,048
Securities held to maturity    
Amortized Cost 43,178 44,921
Gross Unrealized Gains 1,380 1,257
Gross Unrealized Losses (199) (414)
Fair Value 44,359 45,764
Securities    
Total Amortized Cost 1,116,007 814,263
Total Gross Unrealized Gains 17,227 9,262
Total Gross Unrealized Losses (8,207) (17,713)
Total Fair Value 1,125,027 805,812
Debt securities
   
Securities available for sale:    
Amortized Cost 1,027,690 749,300
Gross Unrealized Gains 12,653 5,739
Gross Unrealized Losses (7,293) (16,964)
Fair Value 1,033,050 738,075
Debt securities | Municipal bonds and obligations
   
Securities available for sale:    
Amortized Cost 133,188 77,852
Gross Unrealized Gains 4,739 1,789
Gross Unrealized Losses (513) (1,970)
Fair Value 137,414 77,671
Securities held to maturity    
Amortized Cost 4,259 4,244
Fair Value 4,259 4,244
Debt securities | Government guaranteed residential mortgage-backed securities
   
Securities available for sale:    
Amortized Cost 79,095 78,885
Gross Unrealized Gains 787 544
Gross Unrealized Losses (159) (658)
Fair Value 79,723 78,771
Debt securities | Government-sponsored residential mortgage-backed securities
   
Securities available for sale:    
Amortized Cost 796,407 531,441
Gross Unrealized Gains 5,956 2,000
Gross Unrealized Losses (5,272) (10,783)
Fair Value 797,091 522,658
Securities held to maturity    
Amortized Cost 71 73
Gross Unrealized Gains 3 2
Fair Value 74 75
Debt securities | Corporate bonds
   
Securities available for sale:    
Amortized Cost   40,945
Gross Unrealized Gains   157
Gross Unrealized Losses   (1,822)
Fair Value   39,280
Debt securities | Trust preferred securities
   
Securities available for sale:    
Amortized Cost 15,763 16,927
Gross Unrealized Gains 1,170 1,249
Gross Unrealized Losses (1,276) (1,565)
Fair Value 15,657 16,611
Debt securities | Tax advantaged economic development bonds
   
Securities held to maturity    
Amortized Cost 38,509 40,260
Gross Unrealized Gains 1,377 1,255
Gross Unrealized Losses (199) (414)
Fair Value 39,687 41,101
Debt securities | Other bonds and obligations
   
Securities available for sale:    
Amortized Cost 3,237 3,250
Gross Unrealized Gains 1  
Gross Unrealized Losses (73) (166)
Fair Value 3,165 3,084
Securities held to maturity    
Amortized Cost 339 344
Fair Value 339 344
Marketable equity securities
   
Securities available for sale:    
Amortized Cost 45,139 20,042
Gross Unrealized Gains 3,194 2,266
Gross Unrealized Losses (715) (335)
Fair Value $ 47,618 $ 21,973