mortgagee vs savings bank

mortgagee

noun
  • One who provides a loan secured upon the borrowers' property, the lender in a mortgage agreement. 

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