PARENT COMPANY ONLY FINANCIAL INFORMATION - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Other assets	$ 174,919	$ 130,907
Total assets	7,855,501	7,443,805	$ 6,868,540
Liabilities:
Subordinated debt	99,772	139,091
Trust preferred debentures	49,975	49,374
Total liabilities	7,096,927	6,779,968
Shareholders’ equity	758,574	663,837	$ 621,391	$ 661,911
Total liabilities and shareholders’ equity	7,855,501	7,443,805
Midland States Bancorp, Inc.
Assets
Cash	2,721	37,876
Note receivable due from bank subsidiary	40,000	0
Other assets	8,468	8,094
Total assets	911,318	855,113
Liabilities:
Subordinated debt	99,772	139,091
Trust preferred debentures	49,975	49,374
Other borrowings	0	171
Accrued interest payable and other liabilities	2,997	2,640
Total liabilities	152,744	191,276
Shareholders’ equity	758,574	663,837
Total liabilities and shareholders’ equity	911,318	855,113
Midland States Bancorp, Inc. | Banking Subsidiaries
Assets
Investment in subsidiaries	859,355	808,283
Midland States Bancorp, Inc. | Non-banking Subsidiaries
Assets
Investment in subsidiaries	$ 774	$ 860