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Deposits - Scheduled Maturities of Certificates of Deposit (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Banking and Thrift [Abstract]    
2016 $ 870,679  
2017 304,820  
2018 102,886  
2019 37,742  
2020 41,808  
Thereafter 8,273  
Total $ 1,366,208 $ 1,086,117