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Off Balance Sheet Activities (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Outstanding Financial Instruments Whose Contract Amounts Represent Credit Risk

At December 31, 2017 and 2016, the following financial instruments were outstanding whose contract amounts represent credit risk:

 

     (In Thousands)  
     2017      2016  

Commitments to extend credit

   $ 237,774      $ 223,534  

Credit card arrangements

     20,184        18,316  

Standby letters of credit

     791        875