Fair Value Measurements and Disclosures about Fair Value of Financial Instruments (Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Earnings) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Gains – included in mortgage banking income	$ 3,289	$ 115
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings	743	0
Interest Income [Member]
Interest income	154	0
Mortgage Banking [Member]
Gains – included in mortgage banking income	$ 589	$ 0