Old Second Bancorp, Inc.
A community bank serving individuals and businesses across northern Illinois, offering checking and savings accounts, mortgages, auto and commercial loans, and wealth-management services. Rooted in Aurora, it traces its history to 1871, when its flagship bank held the second-oldest national bank charter in town — which is exactly how it got the name "Old Second." Fun fact: its historic downtown Aurora building, designed in the Prairie School style, sits on the National Register of Historic Places.