The First National Bank of SpongeBob is a black pot that belongs to SpongeBob. It appears in the episode "Life of Crime."
It is a black pot, similar to one a leprechaun has. A rainbow leads to it. The only way to get here is through a rainbow. SpongeBob secretly keeps his money inside, unless he takes it all out or he runs out of money.
Role in episode
When SpongeBob and Patrick look for money to buy a balloon, SpongeBob looks in The First National Bank of SpongeBob, but the pot is completely empty.