Quarterly report pursuant to Section 13 or 15(d)

Held-to-Maturity Securities (Details Textuals)

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Held-to-Maturity Securities (Details Textuals) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Schedule of Held-to-maturity Securities [Line Items]    
Purchases of held-to-maturity securities $ 397,309 $ 734,740