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INVESTMENT SECURITIES (Details 5) (USD $)
12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
item
Dec. 31, 2010
Schedule of Available-for-sale Securities      
Fair value of available for sale securities $ 2,607,029,000 $ 3,072,578,000  
Continuous unrealized loss position 12 months or more, fair value 195,271,000 359,776,000  
Number of securities in a continuous unrealized loss position for more than twelve months 13 24  
Number of individual securities with a continuous unrealized loss position less than 12 months 77 116  
Gross unrealized losses in loss position twelve months or more (19,739,000) (44,188,000)  
Gross Unrealized Losses (26,728,000) (107,746,000)  
Net impairment loss on investment securities available-for-sale recognized in earnings 99,000 633,000 16,669,000
US Government Agencies and Government Sponsored Enterprise Debt Securities
     
Schedule of Available-for-sale Securities      
Number of individual securities with a continuous unrealized loss position less than 12 months 1 5  
Residential mortgage-backed securities
     
Schedule of Available-for-sale Securities      
Number of individual securities with a continuous unrealized loss position less than 12 months 26 16  
Corporate debt securities
     
Schedule of Available-for-sale Securities      
Decrease in corporate debt securities 912,800,000    
Corporate debt securities | Investment grade
     
Schedule of Available-for-sale Securities      
Fair value of available for sale securities 411,983,000 1,322,561,000  
Continuous unrealized loss position 12 months or more, fair value 182,697,000 350,181,000  
Total investment securities available-for-sale portfolio (as a percent) 16.00%    
Number of securities in a continuous unrealized loss position for more than twelve months 8 19  
Number of individual securities with a continuous unrealized loss position less than 12 months 11 89  
Gross unrealized losses in loss position twelve months or more (12,181,000) (33,675,000)  
Gross Unrealized Losses (17,572,000) (95,610,000)  
Corporate debt securities | Non-investment grade
     
Schedule of Available-for-sale Securities      
Fair value of available for sale securities 17,417,000 [1] 19,615,000 [1]  
Continuous unrealized loss position 12 months or more, fair value 12,574,000 9,595,000  
Number of individual securities with a continuous unrealized loss position less than 12 months   4  
Percentage of total amortized cost basis of these securities 38.00%    
Gross unrealized losses in loss position twelve months or more (7,558,000) (10,513,000)  
Gross unrealized losses, trust preferred securities, portion representing impairment loss on securities not other-than-temporarily-impaired 2,500,000    
Gross unrealized losses, trust preferred securities, portion representing non-credit impairment loss on securities other-than-temporarily-impaired 5,100,000    
Gross Unrealized Losses (7,558,000) [1] (11,078,000) [1]  
Mortgage-backed securities
     
Schedule of Available-for-sale Securities      
Continuous unrealized loss position 12 months or more, fair value     6,300,000
Number of private-label available-for-sale mortgage-backed securities sold   1  
Gross Unrealized Losses     8,700,000
Trust Preferred Securities
     
Schedule of Available-for-sale Securities      
Continuous unrealized loss position 12 months or more, fair value 12,600,000 9,600,000  
Total investment securities available-for-sale portfolio (as a percent) 1.00%    
Number of securities in a continuous unrealized loss position for more than twelve months 5 5  
Number of securities for which noncredit-related impairment losses have been recorded during the period   5 14
Noncredit-related impairment losses   633,000 6,700,000
Municipal securities
     
Schedule of Available-for-sale Securities      
Fair value of available for sale securities 167,093,000 79,946,000  
Number of individual securities with a continuous unrealized loss position less than 12 months 29 1  
Gross Unrealized Losses (731,000) (5,000)  
Other securities
     
Schedule of Available-for-sale Securities      
Fair value of available for sale securities 10,170,000 10,068,000  
Number of individual securities with a continuous unrealized loss position less than 12 months   1  
Gross Unrealized Losses   (2,000)  
U.S. Treasury securities
     
Schedule of Available-for-sale Securities      
Fair value of available for sale securities 460,677,000 20,725,000  
Number of individual securities with a continuous unrealized loss position less than 12 months 9    
Gross Unrealized Losses (71,000)    
Other commercial mortgage-backed securities:
     
Schedule of Available-for-sale Securities      
Number of individual securities with a continuous unrealized loss position less than 12 months 1    
Other commercial mortgage-backed securities: | Investment grade
     
Schedule of Available-for-sale Securities      
Fair value of available for sale securities $ 17,084,000    
[1] For 2012, the Company recorded $99 thousand, on a pre-tax basis, of OTTI through earnings and $5.1 million of the non-credit portion of OTTI for pooled trust securities in other comprehensive income. For 2011, the Company recorded $633 thousand, on a pre-tax basis, of OTTI through earnings and $5.1 million of the non-credit portion of OTTI for pooled trust securities and other mortgage-backed securities in other comprehensive income.