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Securities Sold Under Agreements to Repurchase (Tables)
 12 Months Ended
Dec. 31, 2020
Brokers and Dealers [Abstract]  
Summary of Securities Sold Under Agreements to Repurchase
The following is a summary of securities sold under agreements to repurchase as of December 31,
 
    
2020
     2019     2018  
(dollars in thousands)                   
Amount outstanding at December 31
   
$
232,090
 
   $ 266,045     $ 154,240  
Weighted average rate at December 31
   
 
0.34
% 
     0.96 %      0.82 % 
Maximum amount outstanding at any month end
   
$
253,980
 
   $ 307,235     $ 174,150  
Daily average balance outstanding during the year
   
$
221,609
 
   $ 224,361     $ 147,944  
Weighted average rate during the year
   
 
0.62
% 
     1.05 %      0.66 %