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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 266,726 $ 289,412 $ 255,970 $ 252,967
Net income 24,551 24,233 65,620 66,497
Class A conversion   0 0 0
Acquisition of treasury stock (4,997) (19,493) (29,998) (19,493)
Restricted stock issuances     (1,682) (2,894)
Amortization of restricted stock 1,836 1,800 6,032 6,456
Directors' Compensation Plan     911 870
Other comprehensive income 41 50 122 148
Ending balance 283,609 291,541 283,609 291,541
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared $ (4,214) $ (4,164) $ (12,403) $ (12,142)
Cash dividends per share (in dollars per share) $ 0.28 $ 0.25 $ 0.81 $ 0.72
Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared $ (334) $ (297) $ (963) $ (868)
Cash dividends per share (in dollars per share) $ 0.26 $ 0.23 $ 0.75 $ 0.65
Common Stock | Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 30,006 $ 29,903 $ 29,907 $ 29,600
Class A conversion   3 3 186
Restricted stock issuances     96 120
Ending balance 30,006 29,906 30,006 29,906
Common Stock | Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 1,806 1,813 1,809 1,996
Class A conversion   (3) (3) (186)
Ending balance 1,806 1,810 1,806 1,810
Additional Paid-In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 105,674 99,016 102,572 96,850
Restricted stock issuances     (1,778) (3,014)
Amortization of restricted stock 1,836 1,800 6,032 6,456
Directors' Compensation Plan     684 524
Ending balance 107,510 100,816 107,510 100,816
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 375,234 338,341 342,983 304,626
Net income 24,551 24,233 65,620 66,497
Ending balance 395,237 358,113 395,237 358,113
Retained Earnings | Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared (4,214) (4,164) (12,403) (12,142)
Retained Earnings | Class A Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common Stock/Class A Common Stock, Dividends declared (334) (297) (963) (868)
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (2,212) (2,462) (2,293) (2,560)
Other comprehensive income 41 50 122 148
Ending balance (2,171) (2,412) (2,171) (2,412)
Treasury Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (243,782) (177,199) (219,008) (177,545)
Acquisition of treasury stock (4,997) (19,493) (29,998) (19,493)
Directors' Compensation Plan     227 346
Ending balance $ (248,779) $ (196,692) $ (248,779) $ (196,692)