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Borrowings (Tables)
 12 Months Ended
Dec. 31, 2017
Advances from Federal Home Loan Banks [Abstract]  
Summary Of Information Related To Federal Funds Purchased
The following table summarizes information related to federal funds purchased for the years ended December 31, 2017 and 2016:
 
 
 
December 31,
 
 
2017
 
2016
 
 
(dollars in thousands)
Balance at year-end
 
$
—

 
$
—

Average balance during the year
 
$
823

 
$
73

Average interest rate during the year
 
1.64
%
 
0.81
%
Maximum month-end balance during the year
 
$
3,413

 
$
1,302

Gross lines of credit at year-end
 
$
28,000

 
$
36,000

Unused lines of credit at year-end
 
$
28,000

 
$
36,000