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Commitments, Contingencies and Concentrations of Credit Risk (Tables)
12 Months Ended
Dec. 31, 2018
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, 2018 and 2017:

 

   2018   2017 
   (dollars in thousands) 
Commitments under commercial loans and lines of credit  $425,189   $344,142 
Home equity and other revolving lines of credit   39,965    44,483 
Outstanding commercial mortgage loan commitments   355,914    254,710 
Standby letters of credit   36,141    34,114 
Overdraft protection lines   836    688 
Total  $858,045   $678,137