Quarterly report pursuant to Section 13 or 15(d)

Premises and Equipment (Details)

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Premises and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Property, Plant and Equipment, Net, by Type [Abstract]      
Property, Plant and Equipment, Net $ 577,538 $ 564,429 $ 500,736