My husband and I had a combo interview, too. Take along everything you can think of because you never know what they'll ask for. I have a checking account of my own, that I've had for decades, and didn't think it was relevant to our marriage so we didn't include statements from it. The IO saw transfers between the accounts, and asked me to send her a recent statement from mine. She gave me 15 minutes to send it to her. I had to use the bank app to download it and email it to her. Within minutes, she confirmed that my husband's oath ceremony would be that afternoon. So, if you're on the fence about something you may or may not need, take it with you.