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Significant Inputs Considered in Determining the Measurement of Credit Losses Recognized in Earnings for Securities (Detail)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Minimum [Member]
Jun. 30, 2013
Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]      
Current default rate 2.00% [1] 6.00% 9.00%
Prepayment rate 16.00% [1] 7.00% 8.00%
Inputs Considered In Determining Measurement Of Credit Losses Loss Severity 46.00% [1] 61.00% 74.00%
[1] During the six months ended June 30, 2014, all OTTI recognized in earnings related to one private MBS security.