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Business Combinations and Asset Acquisitions	9 Months Ended
Business Combinations and Asset Acquisitions	Sep. 30, 2020
Business Combinations And Asset Acquisitions [Abstract]
Business Combinations and Asset Acquisitions	Business Combinations and Asset Acquisitions Bank Acquisitions On November 1, 2019, the Company completed its acquisition of SBC, Incorporated ("SBC"). SBC was the parent company of Countryside Bank. Through this business combination, the Company acquired Countryside Bank's six banking offices located in Countryside, Burbank, Darien, Homer Glen, Oak Brook and Chicago, Illinois. As of the acquisition date, the Company acquired approximately $619.8 million in assets, including approximately $423.0 million in loans, and approximately $507.8 million in deposits. The Company recorded goodwill of approximately $40.3 million related to the acquisition. On October 7, 2019, the Company completed its acquisition of STC Bancshares Corp. ("STC"). STC was the parent company of STC Capital Bank. Through this business combination, the Company acquired STC Capital Bank's five banking offices located in the communities of St. Charles, Geneva and South Elgin, Illinois. As of the acquisition date, the Company acquired approximately $250.1 million in assets, including approximately $174.3 million in loans, and approximately $201.2 million in deposits. The Company recorded goodwill of approximately $19.1 million related to the acquisition. On May 24, 2019, the Company completed its acquisition of Rush-Oak Corporation ("ROC"). ROC was the parent company of Oak Bank. Through this business combination, the Company acquired Oak Bank's one banking location in Chicago, Illinois, as well as approximately $223.4 million in assets, including loans with a fair value of approximately $124.7 million, and deposits with a fair value of approximately $161.2 million. The Company recorded goodwill of $11.7 million on the acquisition.