Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Unrealized gains (losses) on securities:
Net unrealized losses arising during the period, before tax amount	$ 831
Net unrealized losses arising during period, tax expense	(333)
Net unrealized losses arising during period, net of tax amount	498	$ 615
Less: reclassification adjustment for gains included in net income, before tax amount	4
Less: reclassification adjustment for gains included in net income, tax expense	(1)
Less: reclassification adjustment for gains included in net income, net of tax amount	3
Amortization of unrecognized prior service costs and net gains, before tax amount	(58)
Amortization of unrecognized prior service costs and net gains, tax expense	23
Amortization of unrecognized prior service costs and net gains, net of tax amount	(35)
Other comprehensive income Before- Tax Amount	777
Other comprehensive income Tax Expense	(311)
Total other comprehensive income, net of tax	$ 466	$ 643