Quarterly report pursuant to Section 13 or 15(d)

Held-to-Maturity Securities (Details)

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Held-to-Maturity Securities (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Contractual maturities of held-to-maturity securities      
Held-to-maturity securities, Total $ 670,478 $ 0 $ 0
Held-to-maturity Securities, Fair Value 670,145    
Amortized cost, gross unrealized gains and losses, and fair value by investment category      
Held-to-maturity securities, Total 670,478 0 0
Held-to-maturity Securities, Gross Gain 1,947    
Held-to-maturity Securities, Gross Losses (2,280)    
Held-to-maturity Securities, Fair Value 670,145    
Federal agencies - mortgage backed securities [Member]
     
Contractual maturities of held-to-maturity securities      
Held-to-maturity Securities, Under 1 year 0    
Held-to-maturity Securities, 1-5 years 0    
Held-to-maturity Securities, 6-10 years 0    
Held-to-maturity Securities, Over 10 years 670,478    
Held-to-maturity Securities, Net carrying amount 670,478    
Held-to-maturity securities, Total 670,478    
Fair Value, Under 1 year 0    
Fair Value, 1-5 years 0    
Fair Value, 6-10 years 0    
Fair Value, Over 10 years 670,145    
Held-to-maturity Securities, Fair Value 670,145    
Amortized cost, gross unrealized gains and losses, and fair value by investment category      
Held-to-maturity securities, Total 670,478    
Held-to-maturity Securities, Gross Gain 1,947    
Held-to-maturity Securities, Gross Losses (2,280)    
Held-to-maturity Securities, Fair Value 670,145    
Total U.S. Government backed agencies [Member]
     
Contractual maturities of held-to-maturity securities      
Held-to-maturity securities, Total 670,478    
Held-to-maturity Securities, Fair Value 670,145    
Amortized cost, gross unrealized gains and losses, and fair value by investment category      
Held-to-maturity securities, Total 670,478    
Held-to-maturity Securities, Gross Gain 1,947    
Held-to-maturity Securities, Gross Losses (2,280)    
Held-to-maturity Securities, Fair Value $ 670,145