Financial Instruments with Off-Balance Sheet Risk (Tables)

12 Months Ended

Dec. 31, 2017

Financial Instruments with Off-Balance Sheet Risk [Abstract]

Loan Commitments and Standby Letters of Credit [Table Text Block]

The total amounts of loan commitments and standby letters of credit at December 31 are summarized as follows:

(Dollars in thousands)	2017		2016
Home equity lines of credit	$	83,949	$	85,024
Unadvanced construction loans	112,475		119,075
Other loan commitments	260,552		269,669
Loan commitments	456,976		473,768
Standby letters of credit	$	20,873	$	25,651