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SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
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Mar. 31, 2012
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Jun. 30, 2011
Jun. 30, 2012
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Jun. 30, 2011
Dec. 31, 2011
Available for sale securities            
Amortized Cost $ 856,533     $ 856,533   $ 840,872
Gross Unrealized Gains 39,709     39,709   35,604
Gross Unrealized Losses (205)     (205)   (386)
Fair Value 896,037     896,037   876,090
Available for Sale, Amortized Cost            
Within one year 3,238     3,238    
One through five years 50,431     50,431    
Six through ten years 83,972     83,972    
After ten years 168,522     168,522    
Equity securities 4,938     4,938    
Total available for sale securities 856,533     856,533   840,872
Available for Sale, Fair Value            
Within one year 3,277     3,277    
One through five years 52,995     52,995    
Six through ten years 90,722     90,722    
After ten years 184,847     184,847    
Equity securities 4,938     4,938    
Total securities available-for-sale 896,037     896,037   876,090
Available for sale securities            
Proceeds from sales of securities 930   77,172 20,886 120,600  
Gross gains realized on sales 48   2,521 1,070 3,737  
Gross losses realized on sales 0   0 35 83  
Impairment loss recognized   500        
Number of investments on which impairment loss was recognized   1        
Fair Value of one of the equity holdings 250     250    
Securities in a continuous unrealized loss position with unrealized losses presented by length of time            
Less than 12 months, Fair Value 25,256     25,256   78,541
Less than 12 months, Unrealized Losses (152)     (152)   (343)
12 months or longer, Fair Value 1,235     1,235   237
12 months or longer, Unrealized Losses (53)     (53)   (43)
Total Fair Value 26,491     26,491   78,778
Total Unrealized Losses (205)     (205)   (386)
Other-Than-Temporary-Impairment            
Number of general segments segregated in investment securities portfolio       2    
Number of securities in the portfolio       944    
Number of portfolio securities in unrealized loss position 14     14    
Decline in fair value of security attributable to change in interest rates and illiquidity       25    
U. S. government agency
           
Available for sale securities            
Amortized Cost 2,122     2,122    
Gross Unrealized Gains 36     36    
Fair Value 2,158     2,158    
Available for Sale, Amortized Cost            
Total available for sale securities 2,122     2,122    
Available for Sale, Fair Value            
Total securities available-for-sale 2,158     2,158    
State and municipal
           
Available for sale securities            
Amortized Cost 300,468     300,468   320,269
Gross Unrealized Gains 25,767     25,767   24,723
Gross Unrealized Losses (94)     (94)   (115)
Fair Value 326,141     326,141   344,877
Available for Sale, Amortized Cost            
Total available for sale securities 300,468     300,468   320,269
Available for Sale, Fair Value            
Total securities available-for-sale 326,141     326,141   344,877
Securities in a continuous unrealized loss position with unrealized losses presented by length of time            
Less than 12 months, Fair Value 2,191     2,191   1,576
Less than 12 months, Unrealized Losses (72)     (72)   (72)
12 months or longer, Fair Value 265     265   237
12 months or longer, Unrealized Losses (22)     (22)   (43)
Total Fair Value 2,456     2,456   1,813
Total Unrealized Losses (94)     (94)   (115)
Mortgage-backed securities-residential (GSE's)
           
Available for sale securities            
Amortized Cost 264,228     264,228   264,619
Gross Unrealized Gains 8,912     8,912   7,074
Gross Unrealized Losses (25)     (25)   (189)
Fair Value 273,115     273,115   271,504
Available for Sale, Amortized Cost            
Debt securities without single maturity date 264,228     264,228    
Total available for sale securities 264,228     264,228   264,619
Available for Sale, Fair Value            
Debt securities without single maturity date 273,115     273,115    
Total securities available-for-sale 273,115     273,115   271,504
Securities in a continuous unrealized loss position with unrealized losses presented by length of time            
Less than 12 months, Fair Value 11,133     11,133   50,493
Less than 12 months, Unrealized Losses (25)     (25)   (189)
Total Fair Value 11,133     11,133   50,493
Total Unrealized Losses (25)     (25)   (189)
Collateralized mortgage obligations
           
Available for sale securities            
Amortized Cost 281,204     281,204   246,985
Gross Unrealized Gains 4,994     4,994   3,807
Gross Unrealized Losses (55)     (55)   (25)
Fair Value 286,143     286,143   250,767
Available for Sale, Amortized Cost            
Debt securities without single maturity date 281,204     281,204    
Total available for sale securities 281,204     281,204   246,985
Available for Sale, Fair Value            
Debt securities without single maturity date 286,143     286,143    
Total securities available-for-sale 286,143     286,143   250,767
Securities in a continuous unrealized loss position with unrealized losses presented by length of time            
Less than 12 months, Fair Value 11,932     11,932   25,527
Less than 12 months, Unrealized Losses (55)     (55)   (25)
Total Fair Value 11,932     11,932   25,527
Total Unrealized Losses (55)     (55)   (25)
Agency collateralized mortgage obligations
           
Available for sale securities            
Gross Unrealized Losses (55)     (55)    
Equity securities
           
Available for sale securities            
Amortized Cost 4,938     4,938   5,410
Fair Value 4,938     4,938   5,410
Available for Sale, Amortized Cost            
Total available for sale securities 4,938     4,938   5,410
Available for Sale, Fair Value            
Total securities available-for-sale 4,938     4,938   5,410
Other securities
           
Available for sale securities            
Amortized Cost 3,573     3,573   3,589
Gross Unrealized Losses (31)     (31)   (57)
Fair Value 3,542     3,542   3,532
Available for Sale, Amortized Cost            
Total available for sale securities 3,573     3,573   3,589
Available for Sale, Fair Value            
Total securities available-for-sale 3,542     3,542   3,532
Securities in a continuous unrealized loss position with unrealized losses presented by length of time            
Less than 12 months, Fair Value           945
Less than 12 months, Unrealized Losses           (57)
12 months or longer, Fair Value 970     970    
12 months or longer, Unrealized Losses (31)     (31)    
Total Fair Value 970     970   945
Total Unrealized Losses $ (31)     $ (31)   $ (57)
Other-Than-Temporary-Impairment            
Number of single issue trust preferred securities to which the unrealized losses on other securities are related       1