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Investment Securities (Narrative) (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Investment Securities [Abstract]    
Securities pledged as collateral $ 937,300  
Number of security positions, unrealized loss position | security 360 463
Number of security positions, unrealized loss position for more than 12 months | security 15 9
Securities, 12 months or longer, Fair Value $ 6,197 $ 5,526
Securities, 12 months or longer, Unrealized Losses $ 37 $ 19
Number of security positions, unrealized loss position for less than 12 months | security 345 454
Securities, less than 12 months, Fair Value $ 593,931 $ 642,858
Securities, less than 12 months, Unrealized Losses $ 10,769 $ 12,609