CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Midland States Bancorp, Inc.'s Shareholders' Equity IPO	Midland States Bancorp, Inc.'s Shareholders' Equity Private Placement	Midland States Bancorp, Inc.'s Shareholders' Equity Dividend Declared [Member]	Midland States Bancorp, Inc.'s Shareholders' Equity	Preferred stock Series C preferred stock	Preferred stock Series D preferred stock	Preferred stock Series E preferred stock	Preferred stock Series F preferred stock	Preferred stock	Common stock IPO	Common stock Private Placement	Common stock Series C preferred stock	Common stock Series D preferred stock	Common stock Series E preferred stock	Common stock Series F preferred stock	Common stock	Capital surplus IPO	Capital surplus Private Placement	Capital surplus Series C preferred stock	Capital surplus Series D preferred stock	Capital surplus Series E preferred stock	Capital surplus Series F preferred stock	Capital surplus	Retained earnings Dividend Declared [Member]	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock Series C preferred stock	Treasury stock	Noncontrolling interests in subsidiaries	IPO	Private Placement	Dividend Declared [Member]	Total
Balance at the beginning of the period at Dec. 31, 2013				$ 149,440					$ 57,370							$ 50							$ 14,797		$ 74,576	$ 7,012		$ (4,365)					$ 149,440
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				10,816																					10,816								10,816
Compensation expense for stock option grants				240																			240										240
Amortization of restricted stock awards				468																			468										468
Common dividends declared				(3,512)																					(3,512)								(3,512)
Preferred dividends declared			$ (4,698)																					$ (4,698)								$ (4,698)	(7,601)
Conversion of preferred stock into shares of common stock					(23,600)	(22,470)	(6,300)	(5,000)				17	10	5	2				19,259	22,460	6,295	4,998					4,324
Issuance of common stock for preferred dividends																1							2,902		(2,903)								2,903
Issuance of 2,224,091 shares of common stock for an acquisition				46,706												22							46,684										46,706
Fair value of noncontrolling interest recognized from business combination																													$ 473				473
Issuance of common stock		$ 16,156									$ 9							$ 16,147													$ 16,156
Issuance of common stock under employee benefits plans				215												1							173					$ 41					215
Other comprehensive income (loss)				3,625																						3,625							3,625
Balance at the end of the period at Dec. 31, 2014				219,456												117							134,423		74,279	10,637			473				219,929
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				24,324																					24,324				83				24,407
Cash distributions to noncontrolling interests																													(380)				(380)
Compensation expense for stock option grants				413																			413										413
Amortization of restricted stock awards				517																			517										517
Common dividends declared				(7,692)																					(7,692)								(7,692)
Issuance of common stock under employee benefits plans				470												1							469										470
Other comprehensive income (loss)				(4,608)																						(4,608)							(4,608)
Balance at the end of the period (Scenario, Previously Reported [Member]) at Dec. 31, 2015				232,880												118							135,822		90,911	6,029			176				233,056
Balance at the end of the period at Dec. 31, 2015				232,880												118							135,909		90,824	6,029			176				233,056
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle | Adjustments for New Accounting Principle, Early Adoption [Member] | Accounting Standards Update 2016-09 [Member]																							87		(87)
Net income				31,542																					31,542				(9)				31,533
Cash distributions to noncontrolling interests																													(129)				(129)
Compensation expense for stock option grants				492																			492										492
Amortization of restricted stock awards				(555)																			(555)										(555)
Common dividends declared				(9,853)																					(9,853)								(9,853)
Issuance of common stock	$ 71,475									$ 36							$ 71,439													$ 71,475
Issuance of common stock under employee benefits plans				1,318												1							1,317										1,318
Other comprehensive income (loss)				(6,639)																						(6,639)							(6,639)
Balance at the end of the period at Dec. 31, 2016				$ 321,770												$ 155							$ 209,712		$ 112,513	$ (610)			$ 38				$ 321,808