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Short-term Borrowings - Interest Expense on Short-Term Borrowings (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Interest On Short Term Borrowings [Line Items]      
Total interest on short-term borrowings $ 5,018 $ 2,449 $ 1,262
Federal funds purchased      
Interest On Short Term Borrowings [Line Items]      
Total interest on short-term borrowings 54 42 43
Borrowings from FHLB      
Interest On Short Term Borrowings [Line Items]      
Total interest on short-term borrowings 4,684 2,019 893
Securities sold under agreements to repurchase      
Interest On Short Term Borrowings [Line Items]      
Total interest on short-term borrowings $ 280 $ 388 $ 326