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10. Financial Instrument Commitments (Tables)
12 Months Ended
Dec. 31, 2017
Table Text Block Supplement [Abstract]  
Schedule of Financial Instruments Commitments

A summary of the Bank’s financial instrument commitments is as follows:

 

  2017 2016
     
Commitments to extend credit $4,670,000 $3,784,000
Outstanding letters of credit 317,000 317,000