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Derivative Financial Instruments (Income (loss) Related To Derivative Financial Instruments Included In Mortgage Banking Income) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Derivative, Gain (Loss) on Derivative, Net $ 127 $ 0
Interest Rate Lock Commitments [Member]    
Derivative, Gain (Loss) on Derivative, Net 278 0
Forward Mortgage Loan Sale Contracts [Member]    
Derivative, Gain (Loss) on Derivative, Net $ (151) $ 0