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Employee Benefits, Stock-Based Compensation (Details)
 1 Months Ended 12 Months Ended
Jan. 31, 2016
shares
Dec. 31, 2024
USD ($)
Plan
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Stock-based Compensation [Abstract]        
Number of active incentive stock option plan | Plan   1    
Number of inactive incentive stock option plan | Plan   1    
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Shares available for future issuance (in shares)   336,000    
Unrecognized compensation cost, grant date fair value of vested shares, cash received from option exercises, and actual tax benefit realized [Abstract]        
Unrecognized compensation cost of nonvested share-based compensation arrangements granted under the plan at year-end | $   $ 2,277,000 $ 2,954,000 $ 2,108,000
Total fair value of shares vested for the year | $   954,000 974,000 1,306,000
Cash received from option exercises under all share-based payment arrangements for the year | $   645,000 0 0
Tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the year | $   $ 84,000 $ 0 $ 0
Expected period for recognition of unrecognized compensation cost   2 years 4 months 24 days    
Stock Options [Member]        
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Number of shares to be issued upon exercise (in shares)   0    
Weighted average price (in dollars per share) | $ / shares   $ 0    
Grants (in shares)   0 0 0
Shares available for future issuance (in shares) [1]   336,000    
Restricted Stock [Member]        
Stock-based Compensation [Abstract]        
Shares authorized (in shares)   550,000    
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Number of shares to be issued upon exercise (in shares) [2]      
Weighted average price (in dollars per share) | $ / shares [3]      
Maximum number of shares to be grant to a participant (in shares)   75,000    
Shares available for future issuance (in shares) [1]      
Performance Units [Member]        
Stock-based Compensation [Abstract]        
Number of shares issued to date (in shares)   0    
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Number of shares to be issued upon exercise (in shares) [4]      
Weighted average price (in dollars per share) | $ / shares [3]      
Maximum amount of shares to be grant to a participant | $   $ 1,000,000    
Shares available for future issuance (in shares) [1]      
Stock Appreciation Rights (SARs) [Member]        
Stock-based Compensation [Abstract]        
Number of shares issued to date (in shares)   0    
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Number of shares to be issued upon exercise (in shares) [5]      
Weighted average price (in dollars per share) | $ / shares [3]      
Maximum number of shares to be grant to a participant (in shares)   100,000    
Shares available for future issuance (in shares) [1]      
2015 Plan [Member]        
Stock-based Compensation [Abstract]        
Shares authorized (in shares)   550,000    
Number of shares issued to date (in shares)   221,949    
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Shares available, beginning of period (in shares)   348,146    
Forfeitures (in shares)   2,437    
Shares available for future issuance (in shares)   335,583 348,146  
2015 Plan [Member] | Stock Options [Member]        
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Grants (in shares)   0 0 0
2015 Plan [Member] | Restricted Stock [Member]        
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Shares issued (in shares) 18,069      
Grants (in shares)   (15,000)    
Restricted stock activity, grants [Roll Forward]        
Outstanding at beginning of year (in shares)   96,840 68,137 47,063
Granted (in shares)   15,000 52,865 50,438
Vested (in shares)   (22,831) (23,372) (29,364)
Forfeited (in shares)   (2,437) (790) 0
Outstanding at end of year (in shares)   86,572 96,840 68,137
Restricted stock activity, weighted average fair value at grant [Roll Forward]        
Outstanding at beginning of year (in dollars per share) | $ / shares   $ 43.75 $ 44.13 $ 42.9
Granted (in dollars per share) | $ / shares   41.29 43.1 45.15
Vested (in dollars per share) | $ / shares   43.37 43.32 43.92
Forfeited (in dollars per share) | $ / shares   42.87 44.87 0
Outstanding at end of year (in dollars per share) | $ / shares   $ 43.45 $ 43.75 $ 44.13
2006 Plan [Member] | Stock Options [Member]        
Options, number of shares [Roll Forward]        
Outstanding at beginning of year (in shares)   20,000 20,000 20,000
Exercised (in shares)   20,000 0 0
Outstanding at end of year (in shares)   0 20,000 20,000
Exercisable at end of year (in shares)   0 20,000 20,000
Options, weighted average exercise price [Abstract]        
Outstanding, beginning of period (in dollars per share) | $ / shares   $ 32.27 $ 32.27 $ 32.27
Exercised (in dollars per share) | $ / shares   32.27 0 0
Outstanding, end of period (in dollars per share) | $ / shares   0 32.27 32.27
Exercisable, end of period (in dollars per share) | $ / shares   $ 0 $ 32.27 $ 32.27
Options, additional disclosures [Abstract]        
Intrinsic value of options exercised | $   $ 335,000 $ 0 $ 0
Intrinsic value of options exercisable | $   0 232,000 273,000
Intrinsic value of outstanding options | $   $ 0 $ 232,000 $ 273,000
2006 Plan [Member] | Restricted Stock [Member]        
Restricted stock activity, grants [Roll Forward]        
Outstanding at beginning of year (in shares)   0 0  
Outstanding at end of year (in shares)   0 0 0
2025 Plan [Member]        
Stock-based Compensation [Abstract]        
Shares authorized (in shares)   550,000    
Number of shares issued to date (in shares)   0    
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]        
Maximum number of shares to be grant to a participant (in shares)   100,000    
Grants (in shares)   0    
[1] Under the 2025 Plan, which became effective February 1, 2025,550,000 shares are authorized for issuance; no shares have been issued as of December 31, 2024.  The maximum number of stock options that may be granted to a participant during any calendar year is 100,000 shares.  Under the 2015 Plan, 550,000 shares were authorized for issuance; 221,949 had been issued as of December 31, 2024.  In January of 2016, 18,069 restricted stock shares were issued under the terms of the 2015 Plan pursuant to awards granted under the 2006 Plan.  The 2015 Plan was rendered inactive on February 1, 2025.
[2] The maximum number of shares of restricted stock that may be granted is 550,000 shares, and the maximum that may be granted to a participant during any calendar year is 75,000 shares.
[3] Not applicable.
[4] No performance units payable in stock had been issued as of December 31, 2024.  The maximum payment that can be made pursuant to performance units granted to any one participant in any calendar year is $1,000,000.
[5] No SARS have been issued.  The maximum number of shares with respect to which SARs may be granted to a participant during any calendar year is 100,000 shares.