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Other Borrowings - Contractual Maturities of Other Borrowings (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
Due in 2018 $ 127
Due in 2019 137
Due in 2020 147
Due in 2021 160
Due in 2022 172
Thereafter 251,956
Unamortized debt issuance costs and other basis adjustments (3,917)
Total $ 248,782