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Borrowings Securities Sold under Agreement to Repurchase (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Short-term Debt [Line Items]    
Securities Sold under Agreements to Repurchase $ 208,109 $ 192,330
U.S. Treasury securities and obligations of U.S. government corporations & agencies    
Short-term Debt [Line Items]    
Securities Sold under Agreements to Repurchase 77,333 130,893
US States and Political Subdivisions Debt Securities [Member]    
Short-term Debt [Line Items]    
Securities Sold under Agreements to Repurchase 2,375 0
Mortgage-backed securities    
Short-term Debt [Line Items]    
Securities Sold under Agreements to Repurchase $ 128,401 $ 61,437