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Securities (Securities held to maturity (debt maturities)) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Amortized Cost    
Due in 1 year or less $ 1,359  
Due in 1 to 5 years 27,074  
Due in 5 to 10 years 104,305  
Due after 10 years 111,533  
Amortized Cost 244,271 $ 253,550
Estimated Fair Value    
Due in 1 year or less 1,383  
Due in 1 to 5 years 27,651  
Due in 5 to 10 years 106,680  
Due after 10 years 117,439  
Estimated Fair Value $ 253,153 $ 265,494