Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Officer	Common Stock	Additional paid-in capital	Accumulated dividends in excess of earnings	Accumulated dividends in excess of earnings Officer	Accumulated other comprehensive income (loss)	Non- controlling interests	Non- controlling interests Officer
Balance at Dec. 31, 2018	$ 1,308,428		$ 11	$ 1,441,080	$ (256,438)		$ 3,561	$ 120,214
Balance (in shares) at Dec. 31, 2018			113,992,837
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under the Equity Incentive Plan (in shares)			631,022
Shares issued under the Equity Incentive Plan	1,942			1,942
Shares withheld for employee taxes (in shares)			(125,072)
Shares withheld for employee taxes	(1,986)			(1,986)
Cancellation of restricted stock (in shares)			(6,997)
Stock based compensation expense	8,567			7,352				1,215
Redemption of OP Units (in shares)			143,190
Redemption of OP Units	2,632			2,632				(2,632)
Cash redemption for non-controlling interests	(5,043)							(5,043)
Adjustment to non-controlling interests ownership in Operating Partnership				(2,983)				2,983
Proceeds from the issuance of common stock (in shares)			1,861,036
Proceeds from the issuance of common stock	34,162		$ 1	34,161
Registration expenditures	(732)			(732)
Cash dividends	(99,470)	$ (30)			(90,549)	$ 145		(8,921)	$ (175)
Net income attributable to Retail Opportunity Investments Corp.	48,844				48,844
Net income attributable to non-controlling interests	4,839							4,839
Other comprehensive income (loss)	(7,693)						(7,693)
Balance (in shares) at Dec. 31, 2019			116,496,016
Balance at Dec. 31, 2019	1,291,828		$ 12	1,481,466	(297,998)		(4,132)	112,480
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under the Equity Incentive Plan (in shares)			428,170
Shares issued under the Equity Incentive Plan	0			0
Shares withheld for employee taxes (in shares)			(128,614)
Shares withheld for employee taxes	(2,272)			(2,272)
Cancellation of restricted stock (in shares)			(4,899)
Stock based compensation expense	8,914			8,098				816
Redemption of OP Units (in shares)			1,968,350
Redemption of OP Units	20,098			20,098				(20,098)
Cash redemption for non-controlling interests	(1,999)							(1,999)
Adjustment to non-controlling interests ownership in Operating Partnership	0			(570)				570
Repurchase of common stock (in shares)			(673,868)
Repurchase of common stock	(8,846)			(8,846)
Registration expenditures	(312)			(312)
Cash dividends	(25,460)	(62)			(23,273)	(52)		(2,187)	(10)
Net income attributable to Retail Opportunity Investments Corp.	32,014				32,014
Net income attributable to non-controlling interests	2,707							2,707
Other comprehensive income (loss)	$ (5,353)						(4,680)	(673)
Balance (in shares) at Dec. 31, 2020	118,085,155		118,085,155
Balance at Dec. 31, 2020	$ 1,291,159		$ 12	1,497,662	(289,309)		(8,812)	91,606
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under the Equity Incentive Plan (in shares)			535,819
Shares issued under the Equity Incentive Plan	428			428
Shares withheld for employee taxes (in shares)			(142,247)
Shares withheld for employee taxes	(1,905)			(1,905)
Cancellation of restricted stock (in shares)			(5,482)
Stock based compensation expense	$ 11,030			9,735				1,295
Redemption of OP Units (in shares)	423,986		423,986
Redemption of OP Units	$ 6,858			6,858				(6,858)
Adjustment to non-controlling interests ownership in Operating Partnership	0			(3,625)				3,625
Proceeds from the issuance of common stock (in shares)			3,788,035
Proceeds from the issuance of common stock	$ 69,602		$ 0	69,602
Repurchase of common stock (in shares)	0
Registration expenditures	$ (918)			(918)
Cash dividends	(66,112)	$ (401)			(61,717)	$ (283)		(4,395)	$ (118)
Net income attributable to Retail Opportunity Investments Corp.	53,508				53,508
Net income attributable to non-controlling interests	3,852							3,852
Other comprehensive income (loss)	$ 6,110						5,658	452
Balance (in shares) at Dec. 31, 2021	122,685,266		122,685,266
Balance at Dec. 31, 2021	$ 1,366,353		$ 12	$ 1,577,837	$ (297,801)		$ (3,154)	$ 89,459