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Subsequent Events (Notes)	3 Months Ended
Subsequent Events (Notes)	Mar. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS On April 22, 2014, First Midwest Bank (the "Bank") entered into a definitive purchase and assumption agreement to acquire the Chicago area banking operations of Banco Popular North America (doing business as Popular Community Bank), which is a subsidiary of Popular, Inc. The acquisition includes Popular Community Bank's retail banking offices and its small business and middle market commercial lending activities in the Chicago metropolitan area. As part of the transaction, the Bank will acquire twelve full-service retail branches, approximately $750 million in deposits, and approximately $525 million in loans. The transaction is subject to customary regulatory approvals and certain closing conditions, and is expected to close before the end of 2014.