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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 196,869 $ 302,275
12 Months or less, Unrealized Loss (5,490) (18,609)
More than 12 months, Fair Value 330,241 238,156
More than 12 months, Unrealized Loss (59,541) (49,159)
Total Fair Value 527,110 540,431
Total Unrealized Loss (65,031) (67,768)
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 20,331 21,042
12 Months or less, Unrealized Loss (837) (880)
More than 12 months, Fair Value 40,429 39,567
More than 12 months, Unrealized Loss (4,394) (4,606)
Total Fair Value 60,760 60,609
Total Unrealized Loss (5,231) (5,486)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 88,343 169,594
12 Months or less, Unrealized Loss (1,003) (13,016)
More than 12 months, Fair Value 153,102 73,967
More than 12 months, Unrealized Loss (28,328) (20,624)
Total Fair Value 241,445 243,561
Total Unrealized Loss (29,331) (33,640)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 88,195 111,639
12 Months or less, Unrealized Loss (3,650) (4,713)
More than 12 months, Fair Value 136,710 124,622
More than 12 months, Unrealized Loss (26,819) (23,929)
Total Fair Value 224,905 236,261
Total Unrealized Loss $ (30,469) $ (28,642)