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Commitments, Contingencies and Concentrations of Credit Risk (Tables)
12 Months Ended
Dec. 31, 2015
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, 2015 and 2014:

    2015   2014
    (dollars in thousands)
Commitments under commercial loans and lines of credit   $      278,201   $      236,447
Home equity and other revolving lines of credit     52,191     56,031
Outstanding commercial mortgage loan commitments     273,552     169,043
Standby letters of credit     20,895     27,500
Overdraft protection lines     770     800
Total   $ 625,609   $ 489,821