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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 336,251 $ 208,556
12 Months or less, Unrealized Loss (23,958) (1,923)
More than 12 months, Fair Value 17,575 5,137
More than 12 months, Unrealized Loss (1,294) (164)
Total Fair Value 353,826 213,693
Total Unrealized Loss (25,252) (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 33,010 41,432
12 Months or less, Unrealized Loss (2,064) (473)
More than 12 months, Fair Value 9,936 2,014
More than 12 months, Unrealized Loss (598) (57)
Total Fair Value 42,946 43,446
Total Unrealized Loss (2,662) (530)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 146,815 25,797
12 Months or less, Unrealized Loss (11,246) (107)
Total Fair Value 146,815 25,797
Total Unrealized Loss (11,246) (107)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 156,426 141,327
12 Months or less, Unrealized Loss (10,648) (1,343)
More than 12 months, Fair Value 7,639 3,123
More than 12 months, Unrealized Loss (696) (107)
Total Fair Value 164,065 144,450
Total Unrealized Loss $ (11,344) $ (1,450)