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Investment Securities (Narrative) (Details)
 9 Months Ended
Sep. 30, 2018
USD ($)
Security
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Security
Investments [Abstract]      
Securities pledged as collateral $ 788,900,000   $ 838,400,000
Number of security positions, unrealized loss position | Security 750   411
Number of security positions, unrealized loss position for more than 12 months | Security 308   172
Securities, 12 months or longer, Fair Value $ 503,753,000   $ 274,763,000
Securities, 12 months or longer, Unrealized Losses $ 25,091,000   $ 7,033,000
Number of security positions, unrealized loss position for less than 12 months | Security 442   239
Securities, less than 12 months, Fair Value $ 291,779,000   $ 433,097,000
Securities, less than 12 months, Unrealized Losses 6,061,000   $ 3,957,000
Impairment recorded $ 0 $ 0