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SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
item
Mar. 31, 2013
Dec. 31, 2013
Available for sale securities      
Amortized Cost $ 871,011   $ 889,360
Gross Unrealized Gains 20,417   16,995
Gross Unrealized Losses (10,324)   (15,249)
Fair Value 881,104   891,106
Available for Sale, Amortized Cost      
Within one year 11,760    
One through five years 53,951    
Six through ten years 124,940    
After ten years 126,402    
Equity securities 4,939    
Total available for sale securities 871,011   889,360
Available for Sale, Fair Value      
Within one year 11,940    
One through five years 55,981    
Six through ten years 129,624    
After ten years 133,535    
Equity securities 4,939    
Fair Value 881,104   891,106
Available for sale securities      
Proceeds from sales of securities 0 77,390  
Gross gains realized on sales 0 899  
Gross losses realized on sales 0 55  
Securities in a continuous unrealized loss position with unrealized losses presented by length of time      
Less than 12 months, Fair Value 338,153   413,275
Less than 12 months, Unrealized Losses (8,444)   (14,631)
12 months or longer, Fair Value 39,291   9,246
12 months or longer, Unrealized Losses (1,880)   (618)
Total Fair Value 377,444   422,521
Total Unrealized Losses (10,324)   (15,249)
Other-Than-Temporary-Impairment      
Number of general segments segregated in investment securities portfolio 2    
Number of security in the portfolio 1,033    
Number of portfolio security in unrealized loss position 146    
Decline in fair value of security attributable to change in interest rates and illiquidity 2,643    
U. S. government agency
     
Available for sale securities      
Amortized Cost 707   793
Gross Unrealized Gains 5   5
Fair Value 712   798
Available for Sale, Amortized Cost      
Total available for sale securities 707   793
Available for Sale, Fair Value      
Fair Value 712   798
State and municipal
     
Available for sale securities      
Amortized Cost 312,827   321,151
Gross Unrealized Gains 15,281   12,173
Gross Unrealized Losses (1,254)   (2,212)
Fair Value 326,854   331,112
Available for Sale, Amortized Cost      
Total available for sale securities 312,827   321,151
Available for Sale, Fair Value      
Fair Value 326,854   331,112
Securities in a continuous unrealized loss position with unrealized losses presented by length of time      
Less than 12 months, Fair Value 22,079   31,660
Less than 12 months, Unrealized Losses (846)   (1,791)
12 months or longer, Fair Value 5,513   4,153
12 months or longer, Unrealized Losses (408)   (421)
Total Fair Value 27,592   35,813
Total Unrealized Losses (1,254)   (2,212)
Mortgage-backed securities-residential (Government Sponsored Entity)
     
Available for sale securities      
Amortized Cost 178,590   186,054
Gross Unrealized Gains 3,303   3,175
Gross Unrealized Losses (2,643)   (3,800)
Fair Value 179,250   185,429
Available for Sale, Amortized Cost      
Debt securities without single maturity date 178,590    
Total available for sale securities 178,590   186,054
Available for Sale, Fair Value      
Debt securities without single maturity date 179,250    
Fair Value 179,250   185,429
Securities in a continuous unrealized loss position with unrealized losses presented by length of time      
Less than 12 months, Fair Value 86,318   114,036
Less than 12 months, Unrealized Losses (2,643)   (3,800)
Total Fair Value 86,318   114,036
Total Unrealized Losses (2,643)   (3,800)
Collateralized mortgage obligations (Government Sponsored Entity)
     
Available for sale securities      
Amortized Cost 370,429   372,896
Gross Unrealized Gains 1,828   1,642
Gross Unrealized Losses (6,422)   (9,229)
Fair Value 365,835   365,309
Available for Sale, Amortized Cost      
Debt securities without single maturity date 370,429    
Total available for sale securities 370,429   372,896
Available for Sale, Fair Value      
Debt securities without single maturity date 365,835    
Fair Value 365,835   365,309
Securities in a continuous unrealized loss position with unrealized losses presented by length of time      
Less than 12 months, Fair Value 229,756   267,579
Less than 12 months, Unrealized Losses (4,955)   (9,040)
12 months or longer, Fair Value 32,782   4,100
12 months or longer, Unrealized Losses (1,467)   (189)
Total Fair Value 262,538   271,679
Total Unrealized Losses (6,422)   (9,229)
Other-Than-Temporary-Impairment      
Other than temporary impairment on available for sale securities 0    
Equity securities
     
Available for sale securities      
Amortized Cost 4,939   4,939
Fair Value 4,939   4,939
Available for Sale, Amortized Cost      
Total available for sale securities 4,939   4,939
Available for Sale, Fair Value      
Fair Value 4,939   4,939
Other securities
     
Available for sale securities      
Amortized Cost 3,519   3,527
Gross Unrealized Losses (5)   (8)
Fair Value 3,514   3,519
Available for Sale, Amortized Cost      
Total available for sale securities 3,519   3,527
Available for Sale, Fair Value      
Fair Value 3,514   3,519
Securities in a continuous unrealized loss position with unrealized losses presented by length of time      
12 months or longer, Fair Value 996   993
12 months or longer, Unrealized Losses (5)   (8)
Total Fair Value 996   993
Total Unrealized Losses $ (5)   $ (8)
Other-Than-Temporary-Impairment      
Number of single issue trust preferred securities to which the unrealized losses on other securities are related 1