Premises And Equipment (Summary Of The Carrying Value Of Banking Premises And Equipment) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 190,665	$ 176,845
Accumulated depreciation, property, plant and equipment	88,790	80,061
Property, plant and equipment, net	101,875	96,784
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,566	14,313
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	116,595	110,262
Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 57,504	$ 52,270