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Leases - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Weighted-average lease term 9 years 9 years
Operating lease ROU assets $ 17,600 $ 17,600
Operating lease ROU liabilities 20,531 20,531
Operating lease, expense $ 600 $ 1,900
Weighted average discount rate 3.29% 3.29%
Maximum [Member]    
Operating lease terms 21 years 21 years
Operating lease term extensions 10 years 10 years
Minimum [Member]    
Operating lease terms 1 year 1 year
Operating lease term extensions 5 years 5 years