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Deposits - Scheduled Maturities of Time Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Banking and Thrift [Abstract]    
2016 $ 1,792,981  
2017 883,999  
2018 92,950  
2019 81,749  
2020 141,792  
Thereafter 164,433  
Total time deposits $ 3,157,904 $ 2,742,468