XML 105 R86.htm IDEA: XBRL DOCUMENT v3.6.0.2
Deposits - Additional Information (Detail) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Deposits [Abstract]    
Cash, FDIC Insured Amount $ 100,000  
Aggregate amount of time deposits in denominations of $100,000 38,900,000,000 $ 72,200,000,000
Time deposits mature in 2017 39,800,000,000  
Time deposits mature in 2018 3,000,000  
Time deposits mature in 2019 0  
Time deposits mature in 2020 0  
Time deposits mature in 2021 0  
Time deposits mature in 2022 and thereafter $ 0