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Share-Based Compensation Plans - Company's restricted stock award activities (Details) - Restricted stock
 6 Months Ended
Jun. 30, 2023
USD ($)
$ / shares
shares
Share-Based Compensation Plans  
Shares of Restricted Stock, Non-vested beginning of period | shares 71,808
Shares of Restricted Stock, Vested | shares (150)
Shares of Restricted Stock, Forfeited | shares (775)
Shares of Restricted Stock, Non-vested end of period | shares 70,883
Weighted Average Grant Date Fair Value, Non-vested beginning of period (in dollars per share) $ 24.67
Weighted Average Grant Date Fair Value, Vested (in dollars per share) 28.77
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) 26.49
Weighted Average Grant Date Fair Value, Non-vested end of period (in dollars per share) $ 24.64
Weighted Average Remaining Contractual Term (Years) 2 years 2 months 12 days
Aggregate intrinsic value | $ $ 1,892,000
Fair market value of options granted (in dollars per share) $ 26.69