 AURORA, Ill., Oct. 15, 2021 PRNewswire -- Aurora, IL-based Old Second Bancorp, Inc. Old Second, NASDAQ: OSBC, the holding company for Old Second National Bank, announced today that it has received the bank regulatory approvals required to complete its previously announced merger with Lombard, IL-based West Suburban Bancorp, Inc. West Suburban, and its wholly-owned subsidiary, West Suburban Bank. 