Borrowings (Details) - USD ($)	Jun. 30, 2019	Jun. 30, 2018
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	$ 44,200,000	$ 46,000,000
FHLB variable rate advance (2.01%)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	4,100,000
FHLB fixed rate advance (2.04%, matured 7/2/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	2,000,000
FHLB fixed rate advance (2.03%, matured 7/3/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	1,000,000
FHLB fixed rate advance (2.03%, matured 7/5/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	1,400,000
FHLB fixed rate advance (1.92%, matured 7/10/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	6,000,000
FHLB fixed rate advance (1.73%, matured 7/11/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	4,000,000
FHLB fixed rate advance (1.78%, matured 7/23/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	1,000,000
FHLB fixed rate advance (1.80%, matured 7/30/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	2,500,000
FHLB fixed rate advance (2.07%, matured 8/9/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	3,300,000
FHLB fixed rate advance (2.09%, matured 8/13/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	1,700,000
FHLB fixed rate advance (2.12%, matured 9/17/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	5,000,000
FHLB fixed rate advance (2.12%, matured 9/19/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	4,000,000
FHLB fixed rate advance (2.15%, matured 10/15/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	5,000,000
FHLB fixed rate advance (2.22%, matured 11/13/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	2,300,000
FHLB fixed rate advance (2.22%, matured 11/14/18)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	0	2,700,000
FHLB fixed rate advance (2.45%, matures 7/1/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	7,500,000	0
FHLB fixed rate advance (2.43%, matures 7/2/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	15,000,000	0
FHLB fixed rate advance (2.45%, matures 7/3/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	5,000,000	0
FHLB fixed rate advance (2.43%, matures 7/3/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	8,000,000	0
FHLB fixed rate advance (2.649%, matures 7/23/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	2,500,000	0
FHLB fixed rate advance (2.649%, matures 7/24/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	3,100,000	0
FHLB fixed rate advance (2.647%, matures 7/25/19)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank advances	$ 3,100,000	$ 0