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Stock and Incentive Compensation Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Number of Shares        
Outstanding at beginning of period (in shares) 353,473 504,437 504,437  
Exercised (in shares) (7,941) (27,282)    
Expired (in shares) (2,151) (331)    
Outstanding at end of period (in shares) 343,381 476,824 353,473 504,437
Outstanding and exercisable (in shares) 343,381 476,824    
Weighted Average Exercise Price        
Outstanding at beginning of period (in dollars per share) $ 31.49 $ 29.46 $ 29.46  
Exercised (in dollars per share) 16.66 15.62    
Expired (in dollars per share) 37.18 37.76    
Outstanding at end of period (in dollars per share) 31.79 30.24 $ 31.49 $ 29.46
Outstanding and exercisable (in dollars per share) $ 31.79 $ 30.24    
Weighted average remaining contractual term (in years) 4 years 14 days 5 years 4 years 5 months 15 days 5 years 1 month 17 days
Weighted average remaining contractual term, outstanding and exercisable (in years) 4 years 14 days 5 years    
Aggregate Intrinsic Value $ 771 $ 1,728 $ 1,670 $ 3,736
Aggregate Intrinsic Value, exercised 130 587    
Aggregate Intrinsic Value, outstanding and exercisable $ 771 $ 1,728