Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investment in Securities [Abstract]
Amortized Cost, Due in 1 year or less	$ 21,417
Amortized Cost, Due after 1 year through 5 years	72,344
Amortized Cost, Due after 5 years through 10 years	144,456
Amortized Cost, Due after 10 years	76,554
Amortized Cost, Total	314,771
Fair Value, Due in 1 year or less	21,789
Fair Value, Due after 1 year through 5 years	76,417
Fair Value, Due after 5 years through 10 years	149,664
Fair Value, Due after 10 years	79,599
Fair Value, Total	$ 327,469	$ 317,767