Quarterly report pursuant to Section 13 or 15(d)

Subordinated Notes (Details)

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Subordinated Notes (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Debt Instrument [Line Items]      
Debt Instrument, Carrying Amount $ 554,417    
Subordinated Debt $ 1,494,263 $ 1,503,368 $ 1,487,566