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Debt - Summary of FHLB Debt Matures (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2018 $ 50,896  
2019 40,263  
2020 50,881  
2021 29,971  
Total $ 172,011 $ 220,900