CONSOLIDATED STATEMENTS OF CHANGES IN NET WORTH AND SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock Mutual Holding Company	Common Stock Initial Public Offering	Common Stock	Additional Paid-in Capital Initial Public Offering	Additional Paid-in Capital	Surplus	Undivided Profits	Retained Earnings	Unallocated Common Stock of ESOP	Accumulated Other Comprehensive Loss	Mutual Holding Company	Initial Public Offering	Total
Balance at beginning of period at Jun. 30, 2018						$ 10,658	$ 116,394			$ (8,989)			$ 118,063
Increase (Decrease) in Shareholder's Equity
Net income (loss)							4,443						4,443
Other comprehensive income (loss)										(82)			(82)
Balance at end of period at Sep. 30, 2018						10,658	120,837			(9,071)			122,424
Balance at beginning of period at Jun. 30, 2018						10,658	116,394			(8,989)			118,063
Increase (Decrease) in Shareholder's Equity
Net income (loss)													14,022
Other comprehensive income (loss)													(322)
Balance at end of period at Mar. 31, 2019						10,658	130,416			(9,311)			131,763
Balance at beginning of period at Sep. 30, 2018						10,658	120,837			(9,071)			122,424
Increase (Decrease) in Shareholder's Equity
Net income (loss)							4,800						4,800
Other comprehensive income (loss)										(830)			(830)
Balance at end of period at Dec. 31, 2018						10,658	125,637			(9,901)			126,394
Increase (Decrease) in Shareholder's Equity
Net income (loss)							4,779						4,779
Other comprehensive income (loss)										590			590
Balance at end of period at Mar. 31, 2019						$ 10,658	$ 130,416			(9,311)			131,763
Balance at beginning of period at Jun. 30, 2019								$ 146,068		(11,103)			134,965
Increase (Decrease) in Shareholder's Equity
Cumulative effect of change in accounting principle | ASU 2014-09								291					291
Cumulative effect of change in accounting principle | ASU 2016-01								599		(599)
Net income (loss)								(12,684)					(12,684)
Other comprehensive income (loss)										241			241
Issuance of common stock	$ 143	$ 112		$ 108,800							$ 143	$ 108,912
Issuance of common stock (in shares)	14,287,723	11,170,402
Issuance of common stock to the Pioneer Bank Charitable Foundation			$ 5		$ 5,191								5,196
Issuance of common stock to the Pioneer Bank Charitable Foundation (in shares)			519,554
Purchase of common stock by the ESOP (1,018,325 shares)									$ (13,644)				(13,644)
ESOP shares committed to be released (25,458 shares)					16				341				357
Balance at end of period at Sep. 30, 2019			$ 260		114,007			134,274	(13,303)	(11,461)			223,777
Balance at end of period (in shares) at Sep. 30, 2019			25,977,679
Balance at beginning of period at Jun. 30, 2019								146,068		(11,103)			134,965
Increase (Decrease) in Shareholder's Equity
Net income (loss)													(7,985)
Other comprehensive income (loss)													(223)
Balance at end of period at Mar. 31, 2020			$ 260		114,015			138,973	(12,791)	(11,925)			$ 228,532
Balance at end of period (in shares) at Mar. 31, 2020			25,977,679										25,977,679
Balance at beginning of period at Sep. 30, 2019			$ 260		114,007			134,274	(13,303)	(11,461)			$ 223,777
Balance at beginning of period (in shares) at Sep. 30, 2019			25,977,679
Increase (Decrease) in Shareholder's Equity
Net income (loss)								3,850					3,850
Other comprehensive income (loss)										9			9
ESOP shares committed to be released (25,458 shares)					5				341				346
Balance at end of period at Dec. 31, 2019			$ 260		114,012			138,124	(12,962)	(11,452)			227,982
Balance at end of period (in shares) at Dec. 31, 2019			25,977,679
Increase (Decrease) in Shareholder's Equity
Net income (loss)								849					849
Other comprehensive income (loss)										(473)			(473)
ESOP shares committed to be released (25,458 shares)					3				171				174
Balance at end of period at Mar. 31, 2020			$ 260		$ 114,015			$ 138,973	$ (12,791)	$ (11,925)			$ 228,532
Balance at end of period (in shares) at Mar. 31, 2020			25,977,679										25,977,679