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Federal Funds Purchased (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Carrying Value of Federal Funds Sold, Securities Purchased under Agreements to Resell, and Deposits Paid for Securities Borrowed [Abstract]    
Outstanding federal funds purchased balance $ 0 $ 0
Federal home loan bank, advances, general debt obligations, disclosures, amount of available, unused funds $ 6,200,000  
Minimum    
Federal Funds Purchased [Line Items]    
Interest rate available lines of credit 0.30%  
Maximum    
Federal Funds Purchased [Line Items]    
Interest rate available lines of credit 1.50%  
Federal Reserve Bank Advances    
Federal Funds Purchased [Line Items]    
Lines of credit $ 475,300  
Federal Funds Purchased    
Federal Funds Purchased [Line Items]    
Lines of credit $ 460,000