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Note 12 - Fair Value (Detail) - Collateralized Residential Mortgage Obligations
Jun. 30, 2011
Weighted-average coupon rate 4.90%
Weighted-average coupon rate 5.30%
Weighted-average maturity (in years) 2.4
Weighted-average maturity (in years) 4.4
Information on underlying residential mortgages:  
Origination dates 2000 to 2010
Origination dates 2000 to 2010
Weighted-average coupon rate 5.80%
Weighted-average coupon rate 5.80%
Weighted-average maturity (in years) 9.1
Weighted-average maturity (in years) 7.4