Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Unallocated Common Stock of ESOP [Member]	Treasury Stock, at Cost [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Jun. 30, 2018	$ 287,559	$ 182	$ 179,045	$ 128,365	$ (13,083)		$ (6,950)
Begining Balance (in shares) at Jun. 30, 2018		18,165,110
Net income	2,329			2,329
Other comprehensive income	1						1
Common stock dividends declared	(505)			(505)
ESOP shares committed to be released	493		249		244
Ending Balance at Sep. 30, 2018	289,877	$ 182	179,294	130,189	(12,839)		(6,949)
Ending Balance (in shares) at Sep. 30, 2018		18,165,110
Beginning Balance at Jun. 30, 2018	287,559	$ 182	179,045	128,365	(13,083)		(6,950)
Begining Balance (in shares) at Jun. 30, 2018		18,165,110
Net income	6,639
Other comprehensive income	1,199						1,199
Ending Balance at Mar. 31, 2019	278,316	$ 187	181,066	133,483	(12,364)	$ (18,305)	(5,751)
Ending Balance (in shares) at Mar. 31, 2019		17,804,039
Beginning Balance at Sep. 30, 2018	289,877	$ 182	179,294	130,189	(12,839)		(6,949)
Begining Balance (in shares) at Sep. 30, 2018		18,165,110
Net income	2,324			2,324
Other comprehensive income	478						478
Common stock dividends declared	(520)			(520)
Repurchase of common stock	(4,336)					(4,336)
Repurchase of common stock (in shares)		(222,070)
Restricted stock awards granted		$ 5	(5)
Restricted stock awards granted (in shares)		547,185
Stock-based compensation	482		482
ESOP shares committed to be released	477		232		245
Ending Balance at Dec. 31, 2018	288,782	$ 187	180,003	131,993	(12,594)	(4,336)	(6,471)
Ending Balance (in shares) at Dec. 31, 2018		18,490,225
Net income	1,986			1,986
Other comprehensive income	720						720
Common stock dividends declared	(496)			(496)
Repurchase of common stock	(13,969)					(13,969)
Repurchase of common stock (in shares)		(686,186)
Stock-based compensation	829		829
ESOP shares committed to be released	464		234		230
Ending Balance at Mar. 31, 2019	278,316	$ 187	181,066	133,483	(12,364)	(18,305)	(5,751)
Ending Balance (in shares) at Mar. 31, 2019		17,804,039
Beginning Balance at Jun. 30, 2019	281,307	$ 187	182,129	134,500	(12,114)	(18,305)	(5,090)
Begining Balance (in shares) at Jun. 30, 2019		17,804,039
Net income	2,829			2,829
Other comprehensive income	256						256
Common stock dividends declared	(659)			(659)
Repurchase of common stock	(3,524)					(3,524)
Repurchase of common stock (in shares)		(179,800)
Stock-based compensation	829		829
ESOP shares committed to be released	484		240		244
Ending Balance at Sep. 30, 2019	281,522	$ 187	183,198	136,670	(11,870)	(21,829)	(4,834)
Ending Balance (in shares) at Sep. 30, 2019		17,624,239
Beginning Balance at Jun. 30, 2019	281,307	$ 187	182,129	134,500	(12,114)	(18,305)	(5,090)
Begining Balance (in shares) at Jun. 30, 2019		17,804,039
Net income	6,399
Other comprehensive income	860						860
Ending Balance at Mar. 31, 2020	272,417	$ 187	185,301	138,957	(11,384)	(36,414)	(4,230)
Ending Balance (in shares) at Mar. 31, 2020		16,898,137
Beginning Balance at Sep. 30, 2019	281,522	$ 187	183,198	136,670	(11,870)	(21,829)	(4,834)
Begining Balance (in shares) at Sep. 30, 2019		17,624,239
Net income	2,353			2,353
Other comprehensive income	360						360
Common stock dividends declared	(650)			(650)
Repurchase of common stock	(4,748)					(4,748)
Repurchase of common stock (in shares)		(236,050)
Shares withheld related to income tax withholding	(320)					(320)
Shares withheld related to income tax withholding (in shares)		(15,881)
Stock-based compensation	829		829
ESOP shares committed to be released	493		249		244
Ending Balance at Dec. 31, 2019	279,839	$ 187	184,276	138,373	(11,626)	(26,897)	(4,474)
Ending Balance (in shares) at Dec. 31, 2019		17,372,308
Net income	1,217			1,217
Other comprehensive income	244						244
Common stock dividends declared	(633)			(633)
Repurchase of common stock	(9,517)					(9,517)
Repurchase of common stock (in shares)		(474,171)
Stock-based compensation	829		829
ESOP shares committed to be released	438		196		242
Ending Balance at Mar. 31, 2020	$ 272,417	$ 187	$ 185,301	$ 138,957	$ (11,384)	$ (36,414)	$ (4,230)
Ending Balance (in shares) at Mar. 31, 2020		16,898,137