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Stock-Based Compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Number of Shares  
Outstanding at beginning of period (in shares) | shares 76,959
Granted (in shares) | shares 21,045
Dividend equivalents awarded (in shares) | shares 2,592
Vested (in shares) | shares (25,418)
Forfeited (in shares) | shares (3,226)
Outstanding at end of period (in shares) | shares 71,952
Weighted Average Grant Date Fair Value  
Outstanding at beginning of period (in USD per share) | $ / shares $ 31.77
Granted (in USD per share) | $ / shares 36.46
Dividend equivalents awarded (in USD per share) | $ / shares 32.60
Vested (in USD per share) | $ / shares 25.67
Forfeited (in USD per share) | $ / shares 31.47
Outstanding at end of period (in USD per share) | $ / shares $ 34.16
Weighted average remaining contractual life, Outstanding at end of period 2 years 2 months 5 days