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Borrowings
 12 Months Ended
Dec. 31, 2015
Advances from Federal Home Loan Banks [Abstract]  
Borrowings
Borrowings
The Company, through its subsidiary bank, borrows funds in the form of federal funds purchased and Federal Home Loan Bank advances.
Federal fund lines of credit are extended to the Bank by nonaffiliated banks with which a correspondent banking relationship exists. The line of credit amount is determined by the creditworthiness of the Bank and, in particular, its regulatory capital ratios, which are discussed in Note 16. Federal funds purchased generally mature each business day. The following table summarizes information related to federal funds purchased for the years ended December 31, 2015 and 2014:
 
 
 
December 31,
 
 
2015
 
2014
 
 
(dollars in thousands)
Balance at year-end
 
$
—

 
$
—

Average balance during the year
 
$
1,154

 
$
1,865

Average interest rate during the year
 
0.92
%
 
1.08
%
Maximum month-end balance during the year
 
$
8,329

 
$
10,245

Gross lines of credit at year-end
 
$
36,000

 
$
36,000

Unused lines of credit at year-end
 
$
36,000

 
$
36,000


As of December 31, 2015, the Company also had a $5.0 million gross and unused line of credit, in addition to the $36.0 million in federal funds lines of credit listed in the table above.
As of December 31, 2015, Company had remaining credit availability in the amount of $92.0 million at the Federal Home Loan Bank of Atlanta. This line may be utilized for short and/or long-term borrowing. Advances on the line are secured by all of the Company’s eligible first lien residential real estate loans on one-to-four-unit, single-family dwellings; multi-family dwellings; home equity lines of credit; and commercial real estate loans. The amount of the available credit is limited to a percentage of the estimated market value of the loans as determined periodically by the FHLB of Atlanta. The amount of the available credit is also limited to 20% of total Bank assets.
The Company had $20.0 million in long-term borrowings with the FHLB at December 31, 2015, all maturing in 2017. The interest rate on the single outstanding long-term advance at December 31, 2015 was 1.30%. The Company had no short-term borrowings with the FHLB at December 31, 2015. The Company also had a $15.0 million irrevocable letter of credit at December 31, 2015 with the FHLB to secure public deposits. The Company had $40.0 million in borrowings with the FHLB at December 31, 2014.