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Borrowings (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Short-Term Borrowings The following table sets forth selected information for federal funds purchased and repurchase agreements.
(Dollars in thousands)
 Year End Weighted Rate Average Weighted Rate Average Balance OutstandingMaximum Outstanding at any Month EndBalance at December 31
Federal funds purchased and repurchase agreements:
2020.04 %.3 %$1,966,479 $2,314,756 $2,098,383 
2019.8 1.6 1,822,098 2,394,294 1,850,772 
2018.9 1.3 1,514,144 1,981,761 1,956,389