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Investment Securities (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
security
Mar. 31, 2013
Dec. 31, 2013
security
Investment Securities [Abstract]      
Gross realized gains $ 313 $ 892  
Number of security positions, unrealized loss position 141   331
Number of security positions, unrealized loss position for more than 12 months 21    
Fair value, continuous unrealized loss position for more than 12 months 83,984   50,928
Securities available for sale, 12 months or longer, Unrealized Losses 4,978   2,818
Number of security positions, unrealized loss position for less than 12 months 120    
Fair value, continuous unrealized loss position for less than 12 months 309,087   335,030
Unrealized loss, continuous unrealized loss position for less than 12 months 6,701   14,778
OTTI charge recognized $ 0