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SHORT-TERM BORROWINGS: (Tables)
 12 Months Ended
Dec. 31, 2017
Short Term Borrowings Disclosure [Abstract]  
Schedule of short-term borrowings
A summary of the carrying value of the Corporation's short-term borrowings at December 31, 2017 and 2016 is presented below:
(Dollar amounts in thousands)
 
2017
 
2016
Federal funds purchased
 
$
30,165

 
$
49,982

Repurchase-agreements
 
27,521

 
31,007

 
 
$
57,686

 
$
80,989

 
(Dollar amounts in thousands)
 
2017
 
2016
Average amount outstanding
 
$
39,704

 
$
37,949

Maximum amount outstanding at a month end
 
85,714

 
80,989

Average interest rate during year
 
0.62
%
 
0.35
%
Interest rate at year-end
 
0.96
%
 
0.64
%