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Long-Term Borrowings - Schedule of Maturities of Long-Term Borrowings (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Due in 2016 $ 0  
Due in 2017 0  
Due in 2018 0  
Due in 2019 0  
Due in 2020 0  
Thereafter 86,328  
Total 86,328 $ 85,777
Fixed Rate    
Debt Instrument [Line Items]    
Due in 2016 0  
Due in 2017 0  
Due in 2018 0  
Due in 2019 0  
Due in 2020 0  
Thereafter 0  
Total 0  
Floating Rate    
Debt Instrument [Line Items]    
Due in 2016 0  
Due in 2017 0  
Due in 2018 0  
Due in 2019 0  
Due in 2020 0  
Thereafter 86,328  
Total $ 86,328