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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
security
Mar. 31, 2012
Dec. 31, 2012
Carrying value of securities pledged as collateral $ 563,100,000   $ 613,800,000
Available-for-sale securities, Estimated fair value 1,729,837,000   1,625,168,000
Available-for-sale Securities, Amortized cost 1,713,187,000   1,601,102,000
Gross unrealized losses related to all other securities 5,903,000 [1]   3,394,000 [1]
Unrealized gains on available-for-sale securities, net of tax (4,586,000) 4,850,000  
Realized gains resulted from sale of available-for-sale securities 1,000,000    
Proceeds from sale of available-for-sale securities 18,200,000 2,700,000  
Available-for-sale securities related to individual securities, number of positions 58    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 58    
Available-For-Sale Securities [Member]
     
Available-for-sale securities, Estimated fair value 623,100,000    
Available-for-sale securities, percentage of investment portfolio 36.00%    
Available-for-sale Securities, Amortized cost 629,000,000    
Gross unrealized losses related to all other securities $ 5,900,000    
[1] Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive income.