Leases - Finance lease ROU assets (Details) $ in Thousands	Feb. 29, 2020 USD ($)
Property, Plant and Equipment [Line Items]
Weighted-average remaining lease term in years - operating leases	11 years 4 months 24 days
Weighted-average discount rate - operating leases	2.90%
Premises and Equipment [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment - ROU assets	$ 511,770