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Commitments, Contingencies and Concentrations of Credit Risk (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Supply Commitment [Table Text Block]

The following table provides a summary of financial instruments with off-balance sheet risk at December 31, 2017 and 2016:

 

   2017   2016 
   (dollars in thousands) 
Commitments under commercial loans and lines of credit  $344,142   $267,865 
Home equity and other revolving lines of credit   44,483    52,788 
Outstanding commercial mortgage loan commitments   254,710    263,395 
Standby letters of credit   34,114    18,331 
Overdraft protection lines   688    733 
Total  $678,137   $603,112