XML 16 R121.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Previously Presented (Parenthetical) (Detail) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Measurements, Recurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential loans held for sale $ 24.3us-gaap_LoansHeldForSaleMortgages
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 $ 15.6us-gaap_LoansHeldForSaleMortgages
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember