Condensed Financial Information - Parent Company Only - Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income attributable to common stockholders	$ 1,261	$ 9,463	$ 4,283
Depreciation expense	313	1,564	1,054
Decrease (increase) in other assets	(156)	4,497	683
(Decrease) increase in other liabilities	733	(3,602)	1,056
Net cash provided by operating activities	3,824	12,836	10,855
Cash flows from investing activities:
Proceeds from private placement stock offering, net of issuance costs	0	0	61,265
Net capital expenditures	(590)	(6,771)	(2,955)
Net cash used in investing activities	(16,946)	(63,333)	(49,463)
Cash flows from financing activities:
Proceeds from other borrowings, net of issuance costs	0	0	9,911
Repayments of other borrowings	0	(11,000)	(15,611)
Repurchase shares of common stock	0	0	(1)
Surrender of restricted shares of common stock	(8)	(53)	(33)
Common stock options exercised	90	203	50
Cash dividends paid	0	(2,198)	(1,181)
Net cash provided by financing activities	24,406	60,559	31,425
Net increase (decrease) in cash and cash equivalents	11,284	10,062	(7,183)
Cash and cash equivalents at beginning of period	34,494	45,778	41,677
Cash and cash equivalents at end of period	45,778	55,840	34,494
Citizens Community Bancorp, Inc.
Cash flows from operating activities:
Net income attributable to common stockholders	1,261	9,463	4,283
Depreciation expense	0	12	0
Stock based compensation expense	5	18	12
Adjustments to reconcile net income to net cash provided by operating activities - Equity in undistributed income of subsidiary	(2,257)	(12,170)	(6,519)
Decrease (increase) in other assets	(44)	101	(223)
(Decrease) increase in other liabilities	77	(391)	131
Net cash provided by operating activities	(958)	(2,967)	(2,316)
Cash flows from investing activities:
Proceeds from maturities of interest bearing deposits	0	0	1,241
Proceeds from private placement stock offering, net of issuance costs	0	0	61,265
Cash consideration paid in business combination	(51,128)	(20,970)	0
Net capital expenditures	(12)	0	(50)
Net cash used in investing activities	(51,140)	(20,970)	62,456
Cash flows from financing activities:
Proceeds from other borrowings, net of issuance costs	0	29,913	9,911
Repayments of other borrowings	0	(13,000)	(15,611)
Repurchase shares of common stock	0	0	(1)
Surrender of restricted shares of common stock	(8)	(53)	(33)
Common stock options exercised	90	203	50
Dividend from bank to holding company	0	7,350	0
Cash dividends paid	0	(2,198)	(1,181)
Net cash provided by financing activities	82	22,215	(6,865)
Net increase (decrease) in cash and cash equivalents	(52,016)	(1,722)	53,275
Cash and cash equivalents at beginning of period	58,991	6,975	5,716
Cash and cash equivalents at end of period	$ 6,975	$ 5,253	$ 58,991