Borrowings (Details 1)	Dec. 31, 2018	Jun. 30, 2018
FHLB variable rate advance (2.01% as of June 30, 2018)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.01%
FHLB fixed rate advance (1.73-2.04%, matures July 2018) | Minimum
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		1.73%
FHLB fixed rate advance (1.73-2.04%, matures July 2018) | Maximum
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.04%
FHLB fixed rate advance (2.07-2.09%, matures August 2018) | Minimum
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.07%
FHLB fixed rate advance (2.07-2.09%, matures August 2018) | Maximum
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.09%
FHLB fixed rate advance (2.12%, matures September 2018)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.12%
FHLB fixed rate advance (2.15%, matures October 2018)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.15%
FHLB fixed rate advance (2.22%, matures November 2018)
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate		2.22%
FHLB fixed rate advance (2.28-2.55%, matures January 2019) | Minimum
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate	2.28%
FHLB fixed rate advance (2.28-2.55%, matures January 2019) | Maximum
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate	2.55%
FHLB fixed rate advance (2.61-2.62%, matures March 2019) | Minimum
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate	2.61%
FHLB fixed rate advance (2.61-2.62%, matures March 2019) | Maximum
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Interest rate	2.62%