Investment Securities (Details 3) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Fair Value, Less than 12 months	$ 8,309	$ 40,842
Fair Value, 12 Months or More	4,969	15,938
Fair Value, Total	13,278	56,780
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] [Abstract]
Unrealized Loss, Less than 12 Months	12	262
Unrealized Loss, 12 Months or More	43	366
Unrealized Loss, Total	55	628
U.S. government agency obligations
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Fair Value, Less than 12 months	4,039	4,960
Fair Value, 12 Months or More	2,494	10,060
Fair Value, Total	6,533	15,020
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] [Abstract]
Unrealized Loss, Less than 12 Months	4	14
Unrealized Loss, 12 Months or More	25	206
Unrealized Loss, Total	29	220
Obligations of states and political subdivisions
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Fair Value, Less than 12 months	2,885	13,864
Fair Value, 12 Months or More	1,338	2,234
Fair Value, Total	4,223	16,098
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] [Abstract]
Unrealized Loss, Less than 12 Months	7	155
Unrealized Loss, 12 Months or More	15	92
Unrealized Loss, Total	22	247
Mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Fair Value, Less than 12 months	1,385	22,018
Fair Value, 12 Months or More	1,137	3,590
Fair Value, Total	2,522	25,608
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] [Abstract]
Unrealized Loss, Less than 12 Months	1	93
Unrealized Loss, 12 Months or More	3	51
Unrealized Loss, Total	$ 4	144
Federal Agricultural Mortgage Corporation
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Fair Value, Less than 12 months		0
Fair Value, 12 Months or More		54
Fair Value, Total		54
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] [Abstract]
Unrealized Loss, Less than 12 Months		0
Unrealized Loss, 12 Months or More		17
Unrealized Loss, Total		$ 17