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CHICAGO — Old Second Bank has awarded NAI Hiffman the management of 28 branches spanning 18 suburbs and the city of Chicago. Old Second Bank is a full-service banking business that provides customary consumer and commercial banking products. Its flagship bank, Old Second National Bank, was founded in 1871. The parent entity, Old Second Bancorp Holding Co., was founded in 1982 and is headquartered in Aurora, Ill.