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Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total shareholders’ equity $ 1,266,823 $ 1,255,519 $ 1,220,907 $ 1,175,050 $ 1,163,051 $ 1,159,682
AOCI attributable to parent            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total shareholders’ equity (121,356) $ (130,364) (152,462) $ (161,515) $ (164,367) $ (153,169)
Net unrealized loss on available for sale securities            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income, before tax (189,488)   (233,648)      
Accumulated other comprehensive income, tax effect 56,021   69,075      
Total shareholders’ equity (133,467)   (164,573)      
Unfunded status of the supplemental retirement plans            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income, before tax 16,085   16,085      
Accumulated other comprehensive income, tax effect (4,756)   (4,756)      
Total shareholders’ equity 11,329   11,329      
Joint beneficiary agreement liability            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income, before tax 782   782      
Accumulated other comprehensive income, tax effect 0   0      
Total shareholders’ equity $ 782   $ 782