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SHORT-TERM BORROWINGS (Tables)
12 Months Ended
Dec. 31, 2018
Short-term Debt [Abstract]  
Schedule of short-term borrowings
A summary of our short-term borrowings as of December 31, 2018, 2017 and 2016 is as follows:
 
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(Dollars in thousands)
Amount outstanding at December 31
$
197,000

 
$
32,000

 
$
135,000

Average amount outstanding during year
50,630

 
15,531

 
110,928

Highest month-end balance during year
197,000

 
69,000

 
226,000

Weighted average interest rate on balances outstanding at December 31
2.59
%
 
1.63
%
 
0.74
%
Weighted average interest rate during year
2.44
%
 
1.18
%
 
0.52
%