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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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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)

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