Investment Securities (Amortized Cost And Fair Value Of Investment Securities By Contractual Maturity) (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Available for Sale, Amortized Cost, Due within one year	$ 1,531
Available for Sale, Amortized Cost, Due after one year through five years	11,528
Available for Sale, Amortized Cost, Due after five years through ten years	22,513
Available for Sale, Amortized Cost, Due after ten years	76,504
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total	112,076
Available-for-Sale, Amortized Cost	171,152	$ 165,274
Available for Sale, Fair Value, Due within one year	1,545
Available for Sale, Fair Value, Due after one year through five years	12,046
Available for Sale, Fair Value, Due after five years through ten years	24,131
Available for Sale, Fair Value, Due after ten years	79,844
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Total	117,566
Available-for-sale, Fair Value	178,019	174,493
Held to Maturity, Amortized Cost, Due within one year	220
Held to Maturity, Amortized Cost, Due after one year through five years	984
Held to Maturity, Amortized Cost, Due after five years through ten years	1,055
Held to Maturity, Amortized Cost, Due after ten years	509
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount, Total	2,768
Held-to-Maturity, Amortized Cost	2,955	3,166
Held to Maturity, Fair Value, Due within one year	248
Held to Maturity, Fair Value, Due after one year through five years	1,112
Held to Maturity, Fair Value, Due after five years through ten years	1,207
Held to Maturity, Fair Value, Due after ten years	572
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	3,139
Held-to-Maturity, Fair Value	3,343	$ 3,654
Collateralized Mortgage Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost	16,132
Available-for-sale, Fair Value	16,294
Held-to-Maturity, Amortized Cost	0
Held-to-Maturity, Fair Value	0
Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost	2,956
Available-for-sale, Fair Value	3,769
Held-to-Maturity, Amortized Cost	0
Held-to-Maturity, Fair Value	0
SBA certificates
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost	1,047
Available-for-sale, Fair Value	1,050
Held-to-Maturity, Amortized Cost	0
Held-to-Maturity, Fair Value	0
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale, Amortized Cost	38,941
Available-for-sale, Fair Value	39,340
Held-to-Maturity, Amortized Cost	187
Held-to-Maturity, Fair Value	$ 204