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Investment Securities (Details 2) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Held-to-maturity debt securities amortized cost disclosures          
Due in one year or less, held-to-maturity debt securities amortized cost $ 1,200,000   $ 1,200,000    
Due after one year through five years, held-to-maturity debt securities amortized cost 1,200,000   1,200,000    
Amortized cost, held-to-maturity debt securities 2,400,000   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 1,200,000   1,200,000    
Due after one year through five years, held-to-maturity debt securities, Estimated fair value 1,200,000   1,200,000    
Estimated Fair Value 2,400,000   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 719,000   719,000    
Due after ten years, available-for-sale debt securities amortized cost 256,642,000   256,642,000    
Residential mortgage-backed securities, amortized cost 4,923,587,000   4,923,587,000    
Equity securities, amortized cost 28,075,000   28,075,000    
Amortized cost, Available for sale securities 5,209,023,000   5,209,023,000   5,372,594,000
Available for sale debt securities, Estimated Fair Value Disclosures          
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value 797,000   797,000    
Due after ten years, available-for-sale debt securities, Estimated Fair Value 267,297,000   267,297,000    
Residential mortgage-backed securities, Estimated Fair Value 4,927,863,000   4,927,863,000    
Equity securities, Estimated Fair Value 29,086,000   29,086,000    
Estimated fair value, Available for sale securities 5,225,043,000   5,225,043,000   5,304,579,000
Amortized cost of available for sale investment securities pledged 2,520,425,000   2,520,425,000    
Fair value of available for sale investment securities pledged 2,535,969,000   2,535,969,000    
Proceeds from sales and calls of available for sale securities 110,020,000 0 368,296,000 178,124,000  
Proceeds from sales of mortgage-backed securities 110,020,000 0 367,641,000 177,623,000  
Gross gains realized on sales 1,371,000 0 9,479,000 9,601,000  
Gross losses realized on sales 1,750,000 0 1,750,000 0  
Impairment charges on available for sale securities 189,000 417,000 279,000 727,000  
Impairment charges on available-for-sale investment securities, after tax $ 122,900 $ 271,000 $ 181,300 $ 473,000