Supplemental Disclosure for Earnings Per Common Share (Earnings Per Share Information) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings:
Net income	$ 2,443	$ 2,227	$ 6,974	$ 5,105
Less: Preferred stock dividends declared	0	0	0	(62)
Net income available to common shareholders	$ 2,443	$ 2,227	$ 6,974	$ 5,043
Shares:
Weighted average common shares outstanding	2,225,189	2,204,787	2,217,033	2,197,101
Net income per common share, basic	$ 1.10	$ 1.01	$ 3.15	$ 2.3
Earnings:
Net income available to common shareholders	$ 2,443	$ 2,227	$ 6,974	$ 5,043
Shares:
Weighted average common shares outstanding	2,225,189	2,204,787	2,217,033	2,197,101
Add: Dilutive effect of outstanding options	121,773	101,242	121,267	103,733
Add: Dilutive effect of restricted stock	4,777	0	2,388	0
Weighted average common shares outstanding as adjusted	2,351,739	2,306,029	2,340,688	2,300,834
Net income per common share, diluted	$ 1.04	$ 0.97	$ 2.98	$ 2.19