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Equity Plans (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Compensation Costs Charged to Income and Proceeds from the Exercise of Any Restricted Stock and Similar Instruments that are Recorded to Additional Paid-In Capital and Common Stock, by Award Type
A summary of compensation costs charged to income and proceeds from the exercise of any restricted stock and similar instruments that are recorded to additional paid-in capital and common stock, by award type, are presented below for the three and nine months ended September 30, 2021, and 2020:
 Three months ended September 30,Nine months ended September 30,
 2021202020212020
Compensation costs charged to income:
   ESPP$176 152 $357 323 
   Restricted stock and deferred restricted stock954 906 2,844 1,995 
Total compensation costs charged to income$1,130 1,058 $3,201 2,318 
ESPP proceeds$1,000 860 $2,026 1,830