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Federal Funds Purchased (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
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 $ 5,400,000,000  
Minimum [Member]    
Federal Funds Purchased [Line Items]    
Interest rate available lines of credit 0.20%  
Maximum [Member]    
Federal Funds Purchased [Line Items]    
Interest rate available lines of credit 0.90%  
Federal Reserve Bank Advances [Member]    
Federal Funds Purchased [Line Items]    
Lines of credit $ 333,300,000  
Federal Funds Purchased [Member]    
Federal Funds Purchased [Line Items]    
Lines of credit $ 450,000,000