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SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
security
item
Dec. 31, 2011
Dec. 31, 2010
security
Available for sale securities      
Amortized Cost $ 862,759 $ 840,872  
Gross Unrealized Gains 39,837 35,604  
Gross Unrealized Losses (255) (386)  
Fair Value 902,341 876,090  
Available for Sale, Amortized Cost      
Within one year 6,722    
One through five years 52,535    
Six through ten years 95,047    
After ten years 161,406    
Equity securities 4,939    
Total available for sale securities 862,759 840,872  
Available for Sale, Fair Value      
Within one year 6,857    
One through five years 55,170    
Six through ten years 102,419    
After ten years 178,678    
Equity securities 4,939    
Fair Value 902,341 876,090  
Available for sale securities      
Gross proceeds from sales of securities 64,176 366,559 111,564
Gross gains realized on sales 1,944 11,440 3,018
Gross losses realized on sales 77 83 39
Tax provision related to net realized gains 635 3,861 1,049
Carrying value of securities pledged to secure certain deposits and repurchase agreements, secure future funding needs, and for other purposes as permitted or required by law 259,613 206,639  
Securities in a continuous unrealized loss position with unrealized losses presented by length of time      
Less than 12 months, Fair Value 52,732 78,541  
Less than 12 months, Unrealized Losses (255) (343)  
12 months or longer, Fair Value   237  
12 months or longer, Unrealized Losses   (43)  
Total Fair Value 52,732 78,778  
Total Unrealized Losses (255) (386)  
Other-Than-Temporary-Impairment      
Number of general segments segregated in investment securities portfolio 2    
Number of securities in the portfolio 1,006    
Number of portfolio securities in unrealized loss position 33    
Decline in fair value of security attributable to change in interest rates and illiquidity 8    
Number of equity holdings determined to be other than temporarily impaired and partially written down 1   3
Fair value of the equity holdings 250   136
Impairment loss recognized 500   97
Minimum
     
Available for sale securities      
Percentage of shareholders' equity held by any one issuer, other than the U.S. Government and its sponsored entities 10.00% 10.00%  
U. S. government agency
     
Available for sale securities      
Amortized Cost 1,600    
Gross Unrealized Gains 38    
Fair Value 1,638    
Available for Sale, Amortized Cost      
Total available for sale securities 1,600    
Available for Sale, Fair Value      
Fair Value 1,638    
State and municipal
     
Available for sale securities      
Amortized Cost 310,552 320,269  
Gross Unrealized Gains 27,484 24,723  
Gross Unrealized Losses (97) (115)  
Fair Value 337,939 344,877  
Available for Sale, Amortized Cost      
Total available for sale securities 310,552 320,269  
Available for Sale, Fair Value      
Fair Value 337,939 344,877  
Securities in a continuous unrealized loss position with unrealized losses presented by length of time      
Less than 12 months, Fair Value 6,646 1,576  
Less than 12 months, Unrealized Losses (97) (72)  
12 months or longer, Fair Value   237  
12 months or longer, Unrealized Losses   (43)  
Total Fair Value 6,646 1,813  
Total Unrealized Losses (97) (115)  
Mortgage-backed securities-residential (Government Sponsored Entity)
     
Available for sale securities      
Amortized Cost 219,352 264,619  
Gross Unrealized Gains 7,711 7,074  
Gross Unrealized Losses (8) (189)  
Fair Value 227,055 271,504  
Available for Sale, Amortized Cost      
Debt securities without single maturity date 219,352    
Total available for sale securities 219,352 264,619  
Available for Sale, Fair Value      
Debt securities without single maturity date 227,055    
Fair Value 227,055 271,504  
Securities in a continuous unrealized loss position with unrealized losses presented by length of time      
Less than 12 months, Fair Value 12,766 50,493  
Less than 12 months, Unrealized Losses (8) (189)  
Total Fair Value 12,766 50,493  
Total Unrealized Losses (8) (189)  
Collateralized mortgage obligations (Government Sponsored Entity)
     
Available for sale securities      
Amortized Cost 322,758 246,985  
Gross Unrealized Gains 4,604 3,807  
Gross Unrealized Losses (139) (25)  
Fair Value 327,223 250,767  
Available for Sale, Amortized Cost      
Debt securities without single maturity date 322,758    
Total available for sale securities 322,758 246,985  
Available for Sale, Fair Value      
Debt securities without single maturity date 327,223    
Fair Value 327,223 250,767  
Securities in a continuous unrealized loss position with unrealized losses presented by length of time      
Less than 12 months, Fair Value 32,330 25,527  
Less than 12 months, Unrealized Losses (139) (25)  
Total Fair Value 32,330 25,527  
Total Unrealized Losses (139) (25)  
Equity securities
     
Available for sale securities      
Amortized Cost 4,939 5,410  
Fair Value 4,939 5,410  
Available for Sale, Amortized Cost      
Total available for sale securities 4,939 5,410  
Available for Sale, Fair Value      
Fair Value 4,939 5,410  
Other securities
     
Available for sale securities      
Amortized Cost 3,558 3,589  
Gross Unrealized Losses (11) (57)  
Fair Value 3,547 3,532  
Available for Sale, Amortized Cost      
Total available for sale securities 3,558 3,589  
Available for Sale, Fair Value      
Fair Value 3,547 3,532  
Securities in a continuous unrealized loss position with unrealized losses presented by length of time      
Less than 12 months, Fair Value 990 945  
Less than 12 months, Unrealized Losses (11) (57)  
Total Fair Value 990 945  
Total Unrealized Losses $ (11) $ (57)  
Other-Than-Temporary-Impairment      
Number of single issue trust preferred securities to which the unrealized losses on other securities are related     1