Lease Obligations - Schedule of Right-of-use Asset and Lease Obligations by Type of Property (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Leases Disclosure [Line Items]
Right-of-Use Asset	$ 3,075
Lease Liability	$ 3,031
Weighted Average Lease Term in Years	13 years 9 months 18 days
Weighted Average Discount Rate	3.08%
Land and Building Leases [Member]
Leases Disclosure [Line Items]
Right-of-Use Asset	$ 3,048
Lease Liability	$ 2,998
Weighted Average Lease Term in Years	13 years 10 months 24 days
Weighted Average Discount Rate	3.08%
Equipment Leases [Member]
Leases Disclosure [Line Items]
Right-of-Use Asset	$ 27
Lease Liability	$ 33
Weighted Average Lease Term in Years	2 years 3 months 18 days
Weighted Average Discount Rate	2.59%