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Securities (Securities Available for Sale (Debt Maturities)) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Amortized Cost    
Due in 1 year or less $ 3,831  
Due in 1 to 5 years 40,492  
Due in 5 to 10 years 63,734  
Due after 10 years 130,461  
Total debt securities 238,518  
Mortgage-backed securities 1,001,955  
Equity securities 13,134  
Amortized Cost 1,253,607 $ 1,396,794
Estimated Fair Value    
Due in 1 year or less 3,839  
Due in 1 to 5 years 40,749  
Due in 5 to 10 years 64,596  
Due after 10 years 132,967  
Total debt securities 242,151  
Mortgage-backed securities 1,006,349  
Equity securities 13,187  
Estimated Fair Value $ 1,261,687 $ 1,401,868