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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Other Commitments
A summary of the Company's total contractual amount for all off-balance sheet commitments at December 31, 2017 is as follows: 
Commitments to extend credit
292.8
 million
Standby letters of credit, issued by the Company
5.5
 million