Securities (Schedule of Investment Securities by Amortized Cost and Estimated Fair Market Value) (Details) $ in Thousands	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Investment Holdings [Line Items]
Number of Securities in Unrealized Loss Position	55	47
Securities available-for-sale \| Municipal Bonds
Investment Holdings [Line Items]
Investment Securities Amortized Cost	$ 155	$ 165
Investment Securities Gross Unrealized Gains	0	0
Investment Securities Gross Unrealized Losses	0	0
Investment Securities Fair Value	155	165
Securities available-for-sale \| FHLMC
Investment Holdings [Line Items]
Investment Securities Amortized Cost	10,337	11,140
Investment Securities Gross Unrealized Gains	11	88
Investment Securities Gross Unrealized Losses	(350)	(125)
Investment Securities Fair Value	9,998	11,103
Securities available-for-sale \| FNMA
Investment Holdings [Line Items]
Investment Securities Amortized Cost	7,494	9,532
Investment Securities Gross Unrealized Gains	0	0
Investment Securities Gross Unrealized Losses	(323)	(169)
Investment Securities Fair Value	7,171	9,363
Securities available-for-sale \| GNMA
Investment Holdings [Line Items]
Investment Securities Amortized Cost	421	554
Investment Securities Gross Unrealized Gains	0	0
Investment Securities Gross Unrealized Losses	(20)	(15)
Investment Securities Fair Value	401	539
Securities available-for-sale \| Total available-for-sale
Investment Holdings [Line Items]
Investment Securities Amortized Cost	18,407	21,391
Investment Securities Gross Unrealized Gains	11	88
Investment Securities Gross Unrealized Losses	(693)	(309)
Investment Securities Fair Value	17,725	21,170
Securities held-to-maturity \| Municipal Bonds
Investment Holdings [Line Items]
Investment Securities Amortized Cost		0
Investment Securities Gross Unrealized Gains		0
Investment Securities Gross Unrealized Losses		0
Investment Securities Fair Value		0
Securities held-to-maturity \| FHLMC
Investment Holdings [Line Items]
Investment Securities Amortized Cost	1,805	2,212
Investment Securities Gross Unrealized Gains	30	53
Investment Securities Gross Unrealized Losses	(84)	(52)
Investment Securities Fair Value	1,751	2,213
Securities held-to-maturity \| FNMA
Investment Holdings [Line Items]
Investment Securities Amortized Cost	982	1,209
Investment Securities Gross Unrealized Gains	40	71
Investment Securities Gross Unrealized Losses	(26)	(23)
Investment Securities Fair Value	996	1,257
Securities held-to-maturity \| GNMA
Investment Holdings [Line Items]
Investment Securities Amortized Cost	797	1,528
Investment Securities Gross Unrealized Gains	0	0
Investment Securities Gross Unrealized Losses	(44)	(44)
Investment Securities Fair Value	753	1,484
Securities held-to-maturity \| Total held-to-maturity
Investment Holdings [Line Items]
Investment Securities Amortized Cost	3,584	4,949
Investment Securities Gross Unrealized Gains	70	124
Investment Securities Gross Unrealized Losses	(154)	(119)
Investment Securities Fair Value	$ 3,500	$ 4,954

Anchor Bancorp 10-K/A