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Mortgage-Backed Securities (Narrative) (Details)	12 Months Ended
Mortgage-Backed Securities (Narrative) (Details)	Dec. 31, 2011
Mortgage-Backed Securities [Abstract]
Lower range of contractual maturity of Company's Agency MBS, in years	15
Upper range of contractual maturity of Company's Agency MBS, in years	30

When presenting a range of maturity dates, the latest date when the outstanding debt instruments are required to be repaid. May be presented in a variety of ways (for example: year only, month and year, day, month and year, and number of years).

+ References+ Details

- Definition

When presenting a range of maturity dates, the earliest date when the outstanding debt instruments are required to be repaid. May be presented in a variety of ways (for example: year only, month and year, day, month and year, and number of years).

+ References+ Details