XML 83 R66.htm IDEA: XBRL DOCUMENT v3.3.1.900
Investment Securities - Additional Information (Detail)
12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Investment
Dec. 31, 2014
USD ($)
Investment Holdings [Line Items]      
Gross realized gains on sale of investment securities $ 116,490,000    
Gross realized losses on investment securities 60,033,000    
Number of investment securities with aggregate gross unrealized losses | Investment   1,007  
Unrealized losses on individual investment securities   $ 120,269,000 $ 73,008,000
Cost method investment securities   554,000,000  
Investment securities pledged to secure debt carrying value   4,245,300,000  
Pledged securities that can be sold or repledged   2,136,712,000 $ 1,631,267,000
Available-for-Sale Securities [Member]      
Investment Holdings [Line Items]      
Investment securities pledged to secure debt carrying value   $ 3,333,653,000  
Privately Issued Mortgage-Backed Securities [Member]      
Investment Holdings [Line Items]      
Privately issued mortgage backed securities sold 1,000,000,000    
Net loss on securities sold 46,302,000    
Pre-tax other-than-temporary impairment losses 10,000,000    
Visa Class B [Member]      
Investment Holdings [Line Items]      
Gain on sale of holdings 89,545,000    
MasterCard Class B [Member]      
Investment Holdings [Line Items]      
Gain on sale of holdings $ 13,208,000