depository vs savings bank

depository

noun
  • A trustee; a depositary. 

  • A place where something is deposited, as for storage, safekeeping, or preservation; a repository. 

savings bank

noun
  • A type of financial institution that focuses on retail banking: savings of private depositors, payments, credits and insurances for individuals or small and medium-sized enterprises. 

How often have the words depository and savings bank occurred in a corpus of books? (source: Google Ngram Viewer )