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Federal Funds Purchased (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Banking and Thrift [Abstract]    
Outstanding federal funds purchased balance $ 0 $ 0
Federal home loan bank, advances, general debt obligations, disclosures, amount of available, unused funds $ 6,700,000,000  
Minimum    
Federal Funds Purchased [Line Items]    
Interest rate available lines of credit 1.60%  
Maximum    
Federal Funds Purchased [Line Items]    
Interest rate available lines of credit 2.00%  
Federal Reserve Bank Advances    
Federal Funds Purchased [Line Items]    
Lines of credit $ 544,000,000  
Federal Funds Purchased    
Federal Funds Purchased [Line Items]    
Lines of credit $ 450,000,000