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
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Schedule of Held-to-maturity Securities [Line Items]    
Purchases of held-to-maturity securities $ 0 $ 204,040