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Investment Securities (Narrative) (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Mar. 31, 2017
USD ($)
Investment Securities [Abstract]      
Securities pledged as collateral $ 898,400   $ 838,400
Number of security positions, unrealized loss position | security 621 411  
Number of security positions, unrealized loss position for more than 12 months | security 175 172  
Securities, 12 months or longer, Fair Value $ 268,675 $ 274,763  
Securities, 12 months or longer, Unrealized Losses $ 10,690 $ 7,033  
Number of security positions, unrealized loss position for less than 12 months | security 446 239  
Securities, less than 12 months, Fair Value $ 536,759 $ 433,097  
Securities, less than 12 months, Unrealized Losses $ 12,184 $ 3,957