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Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Investment in Securities [Abstract]
Amortized Cost, Due in 1 year or less	$ 14,994
Amortized Cost, Due after 1 year through 5 years	67,800
Amortized Cost, Due after 5 years through 10 years	139,779
Amortized Cost, Due after 10 years	89,580
Amortized Cost, No stated maturity
Amortized Cost, Total	312,153
Fair Value, Due in 1 year or less	15,225
Fair Value, Due after 1 year through 5 years	71,914
Fair Value, Due after 5 years through 10 years	140,947
Fair Value, Due after 10 years	89,681
Fair Value, No stated maturity
Available-for-sale Securities, Total	$ 317,767	$ 341,935

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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