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Investment Securities (Details 2) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Held-to-maturity debt securities amortized cost disclosures          
Due after one year through five years, held-to-maturity debt securities amortized cost $ 2,400,000   $ 2,400,000    
Amortized cost, held-to-maturity debt securities 2,400,000   2,400,000    
Held-to-maturity debt securities, Estimated fair value disclosures          
Due after one year through five years, held-to-maturity debt securities, Estimated fair value 2,400,000   2,400,000    
Estimated fair value, held-to-maturity debt securities 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 1,281,000   1,281,000    
Due after ten years, available-for-sale debt securities amortized cost 214,073,000   214,073,000    
Residential mortgage-backed securities, amortized cost 5,360,990,000   5,360,990,000    
Equity securities, amortized cost 19,575,000   19,575,000    
Amortized cost, Available for sale securities 5,595,919,000   5,595,919,000   5,082,095,000
Available for sale debt securities, Estimated Fair Value Disclosures          
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value 1,387,000   1,387,000    
Due after ten years, available-for-sale debt securities, Estimated Fair Value 235,082,000   235,082,000    
Residential mortgage-backed securities, Estimated Fair Value 5,467,308,000   5,467,308,000    
Equity securities, Estimated Fair Value 21,258,000   21,258,000    
Estimated fair value, Available for sale securities 5,725,035,000   5,725,035,000   5,213,915,000
Amortized cost of available for sale investment securities pledged 2,338,166,000   2,338,166,000    
Fair value of available for sale investment securities pledged 2,417,979,000   2,417,979,000    
Proceeds from sales and calls of available for sale securities 1,207,581,000 152,013,000 1,279,963,000 926,869,000  
Proceeds from sales of mortgage-backed securities 1,205,556,000 150,325,000 1,237,071,000 920,569,000  
Gross gains realized on sales 32,935,000 6,588,000 35,528,000 9,481,000  
Gross losses realized on sales 0 (1,000) (1,000) (33,000)  
Impairment charges on available-for-sale investment securities 239,000 286,000 647,000 701,000  
Impairment charges on available-for-sale investment securities, after tax $ 155,350 $ 185,900 $ 420,550 $ 455,650