Quarterly report pursuant to Section 13 or 15(d)

Held-to-Maturity Securities (Details Textuals)

Held-to-Maturity Securities (Details Textuals) (USD $)
6 Months Ended 3 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Federal agencies - mortgage backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]    
Available for sale securities transferred to held to maturity securities   $ 469,100,000
Purchases of held-to-maturity securities 204,040,000 204,300,000
Held-to-Maturity Securities (Textuals)    
Unrealized net losses recognized in OCI at the time of transfer of available for sale securities transferred to Held To Maturity Securities $ 500,000