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Borrowings - Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Federal Home Loan Bank advances, variable and fixed rates ranging from 1.51% to 7.53%, due at various dates through November 15, 2024 $ 356,579 $ 336,308
Securities sold under agreements to repurchase 52,116 61,097
Federal Reserve Bank discount window   11,000
Federal funds purchased 141,689 143,252
Notes payable, variable rate of 2.75%, due at various dates through July 13, 2019   12,500
Total borrowings $ 550,384 $ 564,157