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Investment Securities (Narrative) (Details)
 6 Months Ended
Jun. 30, 2019
USD ($)
Security
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Security
Investments [Abstract]      
Securities pledged as collateral $ 694,800,000   $ 751,000,000
Number of security positions, unrealized loss position | Security 161   571
Number of security positions, unrealized loss position for more than 12 months | Security 152   435
Securities, 12 months or longer, Fair Value $ 233,574,000   $ 672,797,000
Securities, 12 months or longer, Unrealized Losses $ 2,196,000   $ 18,467,000
Number of security positions, unrealized loss position for less than 12 months | Security 9   136
Securities, less than 12 months, Fair Value $ 23,461,000   $ 50,770,000
Securities, less than 12 months, Unrealized Losses 40,000   $ 182,000
Impairment recorded $ 0 $ 0