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Share-Based Compensation (Restricted Share Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 186,069 196,857 209,789
Granted (1) 87,605 103,010  
Vested (94,873) (107,435)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (3,520) (8,507)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 32.34 $ 29.32 $ 24.62
Granted (1) 34.97 30.47  
Vested 28.61 21.49  
Forfeited $ 29.37 $ 26.15  
Deferred compensation expense yet to be recognized $ 4,110    
Period of time that deferred compensation expense will be recognized 2 years 3 months 3 days    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 18,060    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 74,477 133,317 141,617
Granted (1) 0 62,560  
Vested (55,500) (62,353)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (3,340) (8,507)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 28.60 $ 27.95 $ 23.06
Granted (1) 0 34.04  
Vested 27.01 23.21  
Forfeited $ 29.00 $ 26.15  
Deferred compensation expense yet to be recognized $ 1,509    
Period of time that deferred compensation expense will be recognized 1 year 11 months 19 days    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 56,155 57,435 63,120
Granted (1) 34,840 37,335  
Vested (36,120) (43,020)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 35.70 $ 32.89 $ 28.20
Granted (1) 35.79 24.71  
Vested 31.32 18.91  
Forfeited $ 0 $ 0  
Deferred compensation expense yet to be recognized $ 1,091    
Period of time that deferred compensation expense will be recognized 1 year 9 months 7 days    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 55,437 6,105 5,052
Granted (1) 52,765 3,115  
Vested (3,253) (2,062)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (180) 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 33.98 $ 25.92 $ 23.56
Granted (1) 34.43 27.95  
Vested 26.07 23.20  
Forfeited $ 36.42 $ 0  
Deferred compensation expense yet to be recognized $ 1,510    
Period of time that deferred compensation expense will be recognized 2 years 10 months 24 days