clearing bank vs savings bank

clearing bank

noun
  • Any of a network of banks that have a formal arrangement for the exchange of cheques, drafts, etc. 

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