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Securities (Available-for-sale Securities, Debt Maturities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Amortized Cost    
Due in 1 year or less $ 185  
Due in 1 to 5 years 54,630  
Due in 5 to 10 years 95,345  
Due after 10 years 296,258  
Total debt securities 446,418  
Mortgage and asset-backed securities 1,785,467  
Equity securities 16,296  
Total investment securities 2,248,181 $ 1,893,947
Estimated Fair Value    
Due in 1 year or less 185  
Due in 1 to 5 years 54,741  
Due in 5 to 10 years 93,393  
Due after 10 years 298,024  
Total debt securities 446,343  
Mortgage and asset-backed securities 1,753,736  
Equity securities 16,674  
Total investment securities $ 2,216,753 $ 1,845,864