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Commitments and Contingent Liabilities - Summary of Future Minimum Lease Payments Under Operating Leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Operating Leases Future Minimum Payments Due [Abstract]  
2019 $ 1,049
2020 789
2021 569
2022 369
2023 60
Later years 499
Total $ 3,335