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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 88,255 $ 159,675
12 Months or less, Unrealized Loss (788) (1,186)
More than 12 months, Fair Value 419,657 414,841
More than 12 months, Unrealized Loss (51,430) (61,687)
Total Fair Value 507,912 574,516
Total Unrealized Loss (52,218) (62,873)
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 987 32,388
12 Months or less, Unrealized Loss 0 (51)
More than 12 months, Fair Value 54,108 55,000
More than 12 months, Unrealized Loss (1,527) (3,243)
Total Fair Value 55,095 87,388
Total Unrealized Loss (1,527) (3,294)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 49,651 98,965
12 Months or less, Unrealized Loss (514) (806)
More than 12 months, Fair Value 187,277 173,668
More than 12 months, Unrealized Loss (24,957) (26,192)
Total Fair Value 236,928 272,633
Total Unrealized Loss (25,471) (26,998)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 37,617 28,322
12 Months or less, Unrealized Loss (274) (329)
More than 12 months, Fair Value 178,272 186,173
More than 12 months, Unrealized Loss (24,946) (32,252)
Total Fair Value 215,889 214,495
Total Unrealized Loss $ (25,220) $ (32,581)