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Investment Securities (Details 2) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Held-to-maturity debt securities amortized cost disclosures      
Due in one year or less, held-to-maturity debt securities amortized cost $ 125,000    
Due after one year through five years, held-to-maturity debt securities amortized cost 2,275,000    
Amortized cost, held-to-maturity debt securities 2,400,000 2,400,000  
Held-to-maturity debt securities, Estimated fair value disclosures      
Due in one year or less, held-to-maturity debt securities, Estimated fair value 125,000    
Due after one year through five years, held-to-maturity debt securities, Estimated fair value 2,275,000    
Estimated fair value 2,400,000 2,400,000  
Available-for-sale debt securities amortized cost disclosures      
Due after five years through ten years, available-for-sale debt securities amortized cost 704,000    
Due after ten years, available-for-sale debt securities amortized cost 247,650,000    
Residential mortgage-backed securities, amortized cost 5,096,165,000    
Equity securities, amortized cost 28,075,000    
Amortized cost, Available for sale securities 5,372,594,000 5,423,189,000  
Available for sale debt securities, Estimated Fair Value Disclosures      
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value 749,000    
Due after ten years, available-for-sale debt securities, Estimated Fair Value 247,662,000    
Residential mortgage-backed securities, Estimated Fair Value 5,027,701,000    
Equity securities, Estimated Fair Value 28,468,000    
Estimated fair value, Available for sale securities 5,304,579,000 5,525,015,000  
Amortized cost of available for sale investment securities pledged 2,250,755,000    
Fair value of available for sale investment securities pledged 2,264,525,000    
Proceeds from sales and calls of available for sale securities 178,123,000 1,382,231,000 1,102,849,000
Proceeds from sales of mortgage-backed securities 177,623,000 1,338,723,000 1,095,815,000
Gross gains realized on sales 9,601,000 38,447,000 17,318,000
Gross losses realized on sales 0 1,000 33,000
Impairment charges on available for sale securities 1,374,000 1,039,000 977,000
Impairment charges on available-for-sale investment securities, after tax $ 893,100 $ 675,000 $ 635,000