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Investment Securities (Narrative) (Details)
 6 Months Ended
Jun. 30, 2018
USD ($)
Security
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Security
Investments [Abstract]      
Securities pledged as collateral $ 813,500,000   $ 838,400,000
Number of security positions, unrealized loss position | Security 563   411
Number of security positions, unrealized loss position for more than 12 months | Security 187   172
Securities, 12 months or longer, Fair Value $ 268,015,000   $ 274,763,000
Securities, 12 months or longer, Unrealized Losses $ 12,196,000   $ 7,033,000
Number of security positions, unrealized loss position for less than 12 months | Security 376   239
Securities, less than 12 months, Fair Value $ 499,432,000   $ 433,097,000
Securities, less than 12 months, Unrealized Losses 14,891,000   $ 3,957,000
Impairment recorded $ 0 $ 0