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Investment Securities (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
Investment Securities [Abstract]      
Securities pledged as collateral $ 907,700 $ 781,700  
Securities transferred from available for sale to held to maturity (at fair value)   165,200  
Unrealized holding losses included in accumulated other comprehensive income and in the carrying value of the held to maturity securities   $ 1,100  
Number of security positions, unrealized loss position | security 463 152  
Number of security positions, unrealized loss position for more than 12 months | security 9 10  
Securities, 12 months or longer, Fair Value $ 5,526 $ 35,864  
Securities, 12 months or longer, Unrealized Losses $ 19 $ 513  
Number of security positions, unrealized loss position for less than 12 months | security 454 142  
Securities, less than 12 months, Fair Value $ 642,858 $ 400,299  
Securities, less than 12 months, Unrealized Losses 12,609 5,593  
OTTI charge recognized $ 0 $ 0 $ 0