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Commitments and Unfunded Credits (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments Representing Credit Risk
At December 31, 2017 and 2016, the following financial instruments were outstanding whose contract amounts represent credit risk (in thousands):
 
 
2017
 
2016
Commitments to extend credit and unfunded commitments under lines of credit
$
77,992

 
$
71,421

Stand-by letters of credit
10,379

 
8,983