It's not $250k per bank. It's $250k per account type. So you get your savings, money market, checking and CD and boom, it's a million at a single bank FDIC insured.
It's $250k per per depositor, per insured bank, for each account ownership category. So if you'd need to move your CD, savings, checking, etc. into separate ownership categories (e.g. one held in a single account, another held in a joint account, another held in a revocable trust) for that to work.