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SHORT-TERM BORROWINGS (Tables)
12 Months Ended
Dec. 31, 2016
Short-term Debt [Abstract]  
Schedule of short-term borrowings
A summary of our short-term borrowings as of December 31, 2016, 2015 and 2014 is as follows:
 
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(Dollars in thousands)
Amount outstanding at December 31
$
135,000

 
$
69,000

 
$
38,000

Average amount outstanding during year
110,928

 
92,045

 
31,732

Highest month-end balance during year
226,000

 
157,000

 
102,000

Weighted average interest rate on balances outstanding at December 31
0.74
%
 
0.35
%
 
0.25
%
Weighted average interest rate during year
0.52
%
 
0.28
%
 
0.29
%