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Investment Securities (Narrative) (Details) (USD $)
 6 Months Ended
Jun. 30, 2014
security
Jun. 30, 2013
Dec. 31, 2013
security
Investment Securities [Abstract]      
Securities pledged as collateral $ 745,500,000   $ 763,100,000
Number of security positions, unrealized loss position 129   331
Number of security positions, unrealized loss position for more than 12 months 61    
Fair value, continuous unrealized loss position for more than 12 months 236,297,000   50,928,000
Securities available for sale, 12 months or longer, Unrealized Losses 7,913,000   2,818,000
Number of security positions, unrealized loss position for less than 12 months 68    
Fair value, continuous unrealized loss position for less than 12 months 82,471,000   335,030,000
Unrealized loss, continuous unrealized loss position for less than 12 months 207,000   14,778,000
OTTI charge recognized $ 0 $ 0