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Investment Securities (Narrative) (Details)
$ in Thousands
Jun. 30, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Investment Securities [Abstract]    
Securities pledged as collateral $ 856,500  
Number of security positions, unrealized loss position | security 29 174
Number of security positions, unrealized loss position for more than 12 months | security 6 14
Securities, 12 months or longer, Fair Value $ 3,272 $ 35,864
Securities, 12 months or longer, Unrealized Losses $ 8 $ 513
Number of security positions, unrealized loss position for less than 12 months | security 23 160
Securities, less than 12 months, Fair Value $ 21,523 $ 400,299
Securities, less than 12 months, Unrealized Losses $ 37 $ 5,593