Loans, Allowance for Loan Losses and Impaired Loans (Details 3) - USD ($) $ in Thousands	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016
Loans receivable
Total loans	$ 534,808	$ 574,439	$ 466,492
Performing loans
Loans receivable
TDR loans	3,067	7,099
Loans other	525,398	564,070
Total loans	528,465	571,169
Nonperforming loans
Loans receivable
TDR loans	404	1,606
Loans other	5,939	1,664
Total loans	6,343	3,270
Residential Real Estate
Loans receivable
Total loans	165,845	187,432	172,915
Residential Real Estate | Performing loans
Loans receivable
TDR loans	2,684	3,955
Loans other	161,514	181,734
Total loans	164,198	185,689
Residential Real Estate | Nonperforming loans
Loans receivable
TDR loans	369	516
Loans other	1,278	1,227
Total loans	1,647	1,743
Commercial/Agriculture Real Estate
Loans receivable
Total loans	162,832	151,129	85,821
Commercial/Agriculture Real Estate | Performing loans
Loans receivable
TDR loans	0	1,378
Loans other	160,024	148,803
Total loans	160,024	150,181
Commercial/Agriculture Real Estate | Nonperforming loans
Loans receivable
TDR loans	0	948
Loans other	2,808	0
Total loans	2,808	948
Consumer Non-real Estate
Loans receivable
Total loans	159,368	190,230	$ 207,756
Consumer Non-real Estate | Performing loans
Loans receivable
TDR loans	340	288
Loans other	158,781	189,641
Total loans	159,121	189,929
Consumer Non-real Estate | Nonperforming loans
Loans receivable
TDR loans	35	43
Loans other	212	258
Total loans	247	301
Commercial/Agricultural Non-real Estate
Loans receivable
Total loans	46,763	45,648
Commercial/Agricultural Non-real Estate | Performing loans
Loans receivable
TDR loans	43	1,478
Loans other	45,079	43,892
Total loans	45,122	45,370
Commercial/Agricultural Non-real Estate | Nonperforming loans
Loans receivable
TDR loans	0	99
Loans other	1,641	179
Total loans	$ 1,641	$ 278