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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 384,263 $ 208,556
12 Months or less, Unrealized Loss (50,817) (1,923)
More than 12 months, Fair Value 18,090 5,137
More than 12 months, Unrealized Loss (2,013) (164)
Total Fair Value 402,353 213,693
Total Unrealized Loss (52,830) (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 31,915 41,432
12 Months or less, Unrealized Loss (3,139) (473)
More than 12 months, Fair Value 9,788 2,014
More than 12 months, Unrealized Loss (703) (57)
Total Fair Value 41,703 43,446
Total Unrealized Loss (3,842) (530)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 186,441 25,797
12 Months or less, Unrealized Loss (27,432) (107)
More than 12 months, Fair Value 1,204  
More than 12 months, Unrealized Loss (240)  
Total Fair Value 187,645 25,797
Total Unrealized Loss (27,672) (107)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 165,907 141,327
12 Months or less, Unrealized Loss (20,246) (1,343)
More than 12 months, Fair Value 7,098 3,123
More than 12 months, Unrealized Loss (1,070) (107)
Total Fair Value 173,005 144,450
Total Unrealized Loss $ (21,316) $ (1,450)