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Securities (Securities held to maturity (debt maturities)) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Amortized Cost    
Due in 1 year or less $ 4,380  
Due in 1 to 5 years 14,327  
Due in 5 to 10 years 87,072  
Due after 10 years 164,644  
Total debt securities 270,423  
Mortgage-backed securities 0  
Amortized Cost 270,423 $ 279,117
Estimated Fair Value    
Due in 1 year or less 4,448  
Due in 1 to 5 years 15,170  
Due in 5 to 10 years 92,495  
Due after 10 years 180,741  
Total debt securities 292,854  
Mortgage-backed securities 0  
Estimated Fair Value $ 292,854 $ 294,513