Annual report pursuant to Section 13 and 15(d)

Borrowings - Summary of Contractual Maturities Pertaining to FHLB (Detail)

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Borrowings - Summary of Contractual Maturities Pertaining to FHLB (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Federal Home Loan Banks [Abstract]    
Year of Maturity, 2019, Amount $ 55,000 $ 150,000
Total FHLB advances $ 55,000 $ 150,000
Year of Maturity, 2019, Weighted-Average Interest Rate 2.56%  
Year of Maturity, Total, Weighted-Average Interest Rate 2.56%