financial institution vs savings bank

financial institution

noun
  • An institution, such as a bank, insurance company or fund, that provides financial services for its clients or members. 

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 financial institution and savings bank occurred in a corpus of books? (source: Google Ngram Viewer )