Business Acquisitions and Divestitures (Details) - USD ($) $ / shares in Units, $ in Millions	Jan. 26, 2017	Jun. 17, 2016
Fairview Heights, Aviston and St. Rose, Illinois
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain		$ 1.1
Midland States Bancorp, Inc. \| Centrue Financial
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration transferred	$ 175.1
Consideration transferred per share (in dollars per share)	$ 26.75
Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deposits		51.7
Loans		13.1
Fixed assets		$ 5.1

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount classified as accounts, notes and loans receivable attributable to disposal group held for sale or disposed of.

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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