Annual report pursuant to Section 13 and 15(d)

Share Based Compensation (Share Based Compensation Plans) (Details)

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Share Based Compensation (Share Based Compensation Plans) (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement [Abstract]      
Restricted stock awards granted (in shares) 167,650 149,950 121,850
Restricted stock awards forfeited (in shares) 0 (4,230) 0
Director stock awards granted (in shares) 2,375 2,125 2,875
Stock Option Activities:      
Outstanding as of the beginning of year (in shares) 1,454,074 1,467,391 1,546,014
Granted (in shares) 175,800 165,650 142,550
Exercised (in shares) (123,829) (165,893) (220,694)
Forfeited (in shares) 0 (5,200) 0
Expired (in shares) (5,986) (7,874) (479)
Outstanding as of the end of year (in shares) 1,500,059 1,454,074 1,467,391
Employee Stock Purchase Plans shares issued (in shares) 62,161 44,383 45,251
Shares available for issuance under Share Incentive and Employee Stock Purchase Plans as of the end of year (in shares) 1,037,414 539,414 884,218