XML 112 R97.htm IDEA: XBRL DOCUMENT v3.8.0.1
Short-Term Borrowings - Lines of Credit (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Lines of credit  
Amount drawn under lines of credit $ 0.0
Federal Home Loan Bank line of credit  
Lines of credit  
Amount available 1,800.0
Federal Reserve Bank line of credit  
Lines of credit  
Amount available $ 688.7