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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 446,683 $ 208,556
12 Months or less, Unrealized Loss (56,166) (1,923)
More than 12 months, Fair Value 127,104 5,137
More than 12 months, Unrealized Loss (25,364) (164)
Total Fair Value 573,787 213,693
Total Unrealized Loss (81,530) (2,087)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 20,930 41,432
12 Months or less, Unrealized Loss (880) (473)
More than 12 months, Fair Value 39,122 2,014
More than 12 months, Unrealized Loss (4,797) (57)
Total Fair Value 60,052 43,446
Total Unrealized Loss (5,677) (530)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 266,106 25,797
12 Months or less, Unrealized Loss (43,065) (107)
More than 12 months, Fair Value 8,192  
More than 12 months, Unrealized Loss (3,516)  
Total Fair Value 274,298 25,797
Total Unrealized Loss (46,581) (107)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 159,647 141,327
12 Months or less, Unrealized Loss (12,221) (1,343)
More than 12 months, Fair Value 79,790 3,123
More than 12 months, Unrealized Loss (17,051) (107)
Total Fair Value 239,437 144,450
Total Unrealized Loss $ (29,272) $ (1,450)