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SHORT-TERM BORROWINGS (Tables)
12 Months Ended
Dec. 31, 2019
Short-term Debt [Abstract]  
Schedule of short-term borrowings
A summary of our short-term borrowings as of December 31, 2019, 2018 and 2017 is as follows:
 
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
(Dollars in thousands)
Amount outstanding at December 31
$
150,000

 
$
197,000

 
$
32,000

Average amount outstanding during year
185,909

 
50,630

 
15,531

Highest month-end balance during year
334,500

 
197,000

 
69,000

Weighted average interest rate on balances outstanding at December 31
1.81
%
 
2.59
%
 
1.63
%
Weighted average interest rate during year
2.31
%
 
2.44
%
 
1.18
%