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Borrowings - Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Federal Home Loan Bank advances, variable and fixed rates ranging from 0.68% to 7.53%, due at various dates through August 20, 2029 $ 390,800 $ 356,579
Securities sold under agreements to repurchase 90,941 52,116
Federal funds purchased 68,000 141,689
Total borrowings $ 549,741 $ 550,384