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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Gains or losses recorded in consolidated statement of operations $ 4,900,000 $ 1,200,000  
Carrying value of securities pledged as collateral 706,300,000   634,800,000
Available-for-sale securities, Estimated fair value 1,347,535,000   1,214,141,000
Available-for-sale Securities, Amortized cost 1,329,751,000   1,204,205,000
Credit-related other-than-temporary impairment 200,000    
Gross unrealized losses related to all other securities 4,485,000 [1]   8,114,000 [1]
Proceeds from sale of available-for-sale securities 2,700,000    
Available-For-Sale Securities [Member]
     
Available-for-sale securities, Estimated fair value 336,400,000    
Available-for-sale securities, percentage of investment portfolio 25.00%    
Available-for-sale Securities, Amortized cost 331,900,000    
Gross unrealized losses related to all other securities $ 4,500,000    
[1] Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive loss.