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Held-to-Maturity Securities (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Contractual maturities of held-to-maturity securities
Held-to-maturity securities, Total	$ 658,250	$ 0	$ 0
Held-to-maturity Securities, Fair Value	682,897
Amortized cost, gross unrealized gains and losses, and fair value by investment category
Held-to-maturity securities, Total	658,250	0	0
Held-to-maturity Securities, Gross Gain	24,647
Held-to-maturity Securities, Gross Losses	0
Held-to-maturity Securities, Fair Value	682,897
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	658,250
Held-to-maturity securities, Total	658,250
Fair Value, Under 1 year	0
Fair Value, 1-5 years	0
Fair Value, 6-10 years	0
Fair Value, Over 10 years	682,897
Held-to-maturity Securities, Fair Value	682,897
Amortized cost, gross unrealized gains and losses, and fair value by investment category
Held-to-maturity securities, Total	658,250
Held-to-maturity Securities, Gross Gain	24,647
Held-to-maturity Securities, Gross Losses	0
Held-to-maturity Securities, Fair Value	682,897
Total U.S. Government backed agencies [Member]
Contractual maturities of held-to-maturity securities
Held-to-maturity securities, Total	658,250
Held-to-maturity Securities, Fair Value	682,897
Amortized cost, gross unrealized gains and losses, and fair value by investment category
Held-to-maturity securities, Total	658,250
Held-to-maturity Securities, Gross Gain	24,647
Held-to-maturity Securities, Gross Losses	0
Held-to-maturity Securities, Fair Value	$ 682,897