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Short-term Borrowings - Interest Expense on Short-Term Borrowings (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest On Short Term Borrowings [Line Items]      
Total interest on short-term borrowings $ 10,741 $ 8,799 $ 8,076
Federal funds purchased      
Interest On Short Term Borrowings [Line Items]      
Total interest on short-term borrowings 180 77 41
Borrowings from FHLB      
Interest On Short Term Borrowings [Line Items]      
Total interest on short-term borrowings 9,929 8,360 7,765
Securities sold under agreements to repurchase      
Interest On Short Term Borrowings [Line Items]      
Total interest on short-term borrowings $ 632 $ 362 $ 270