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Equity Plans - Restricted Stock and Deferred Restricted Stock Activity (Details) - Restricted Stock and Deferred Restricted Stock - Incentive Plan
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Restricted and Deferred Restricted Stock Awards Activity  
Outstanding, beginning balance (in shares) | shares 174,764
Granted (in shares) | shares 68,995
Issued (in shares) | shares (61,155)
Forfeited (in shares) | shares (4,498)
Outstanding ending balance (in shares) | shares 178,106
Vested (in shares) | shares 68,317
Weighted- Average Grant- Date Fair Value  
Outstanding, beginning balance (in dollars per share) | $ / shares $ 46.63
Issued (in dollars per share) | $ / shares 67.50
Exercised (in dollars per share) | $ / shares 44.92
Forfeited (in dollars per share) | $ / shares 55.80
Outstanding, ending balance (in dollars per share) | $ / shares 53.43
Vested (in dollars per share) | $ / shares $ 34.55
Nonvested Restricted and Deferred Restricted Stock Awards Activity  
Nonvested, beginning balance (in shares) | shares 93,153
Granted (in shares) | shares 68,995
Vested (in shares) | shares (50,210)
Forfeited (in shares) | shares (2,149)
Nonvested, ending balance (in shares) | shares 109,789
Weighted-  Average Grant- Date Fair Value  
Nonvested, beginning balance (in dollars per share) | $ / shares $ 39.57
Granted (in dollars per share) | $ / shares 67.50
Vested (in dollars per share) | $ / shares 59.17
Forfeited (in dollars per share) | $ / shares 54.33
Nonvested, ending balance (in dollars per share) | $ / shares $ 65.18