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Reconciliations of Equity - Reconciliations of Total Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reconciliations of total equity        
Beginning Balance $ 1,241,713 $ 1,192,436 $ 1,169,934 $ 1,216,490
Issuance of common stock under incentive compensation plan 0 57 104 1,023
Stock-based and deferred compensation 1,618 1,524 2,708 1,241
Net income 10,839 23,606 41,891 47,020
Other comprehensive income (loss) 1,311 10,178 58,230 (21,120)
Cash dividends paid:        
Common stock (8,709) (8,436) (26,095) (25,289)
Ending Balance 1,246,772 1,219,365 1,246,772 1,219,365
Common Stock [Member]        
Reconciliations of total equity        
Beginning Balance 27,291 27,142 27,156 27,006
Issuance of common stock under incentive compensation plan   1 2 24
Stock-based and deferred compensation 3 6 136 119
Cash dividends paid:        
Ending Balance 27,294 27,149 27,294 27,149
Additional Paid-in Capital [Member]        
Reconciliations of total equity        
Beginning Balance 256,575 250,945 253,779 247,032
Issuance of common stock under incentive compensation plan   56 102 999
Stock-based and deferred compensation 1,620 1,674 4,314 4,644
Cash dividends paid:        
Ending Balance 258,195 252,675 258,195 252,675
Common Treasury Stock [Member]        
Reconciliations of total equity        
Beginning Balance (189,786) (187,778) (188,049) (184,412)
Stock-based and deferred compensation (5) (156) (1,742) (3,522)
Cash dividends paid:        
Ending Balance (189,791) (187,934) (189,791) (187,934)
Accumulated Other Comprehensive Income (Loss) [Member]        
Reconciliations of total equity        
Beginning Balance (139,919) (161,900) (196,838) (130,602)
Other comprehensive income (loss) 1,311 10,178 58,230 (21,120)
Cash dividends paid:        
Ending Balance (138,608) (151,722) (138,608) (151,722)
Retained Earnings [Member]        
Reconciliations of total equity        
Beginning Balance 1,287,552 1,264,027 1,273,886 1,257,466
Net income 10,839 23,606 41,891 47,020
Cash dividends paid:        
Common stock (8,709) (8,436) (26,095) (25,289)
Ending Balance $ 1,289,682 $ 1,279,197 $ 1,289,682 $ 1,279,197