English Other Other

"Frank, on the other hand, was private and shy. An only child, he had grown up an outsider, with few friends. He didn’t like to socialize much and often felt uncomfortable in the presence of others. He sought security, not so much in the company of others, but in a stable, organized, rational life. You could always depend on Frank. His checkbook was always balanced, literally
and figuratively. His life was a lesson in the avoidance of excess." A. Christensen 'Reconcilable differences'

I can understand what it means that his checkbook was balanced - literally but I have no idea what the author means by 'figuratively' (of course I understand the meaning of the word but can't work out in what way the checkbook can be balanced - figuratively). Perhaps someone can help me...