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Securities Sold Under Agreements to Repurchase (Tables)
 12 Months Ended
Dec. 31, 2019
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,
 
   
2019
  2018  2017 
(dollars in thousands)          
Amount outstanding at December 31
  
$
266,045
 
 $154,240  $158,990 
Weighted average rate at December 31
  
 
0.96
% 
  0.82%   0.32% 
Maximum amount outstanding at any month end
  
$
307,235
 
 $174,150  $228,848 
Daily average balance outstanding during the year
  
$
224,361
 
 $147,944  $189,684 
Weighted average rate during the year
  
 
1.05
% 
  0.66%   0.26%