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Short-Term Borrowings - Summary of Securities Pledged as Collateral Under Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Offsetting Liabilities [Line Items]    
Total securities pledged $ 15,554 $ 22,199
Gross amount of recognized liabilities for repurchase agreements 15,554 22,199
Amounts related to agreements not included in offsetting disclosures above 0 0
U.S.Treasury Securities [Member]    
Offsetting Liabilities [Line Items]    
Total securities pledged 615 861
Obligations of U.S. Government Agencies [Member]    
Offsetting Liabilities [Line Items]    
Total securities pledged $ 14,939 $ 21,338