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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 208,556 | $ 14,130
12 Months or less, Unrealized Loss | (1,923) | (34)
More than 12 months, Fair Value | 5,137 | 126
More than 12 months, Unrealized Loss | (164) | (1)
Total Fair Value | 213,693 | 14,256
Total Unrealized Loss | (2,087) | (35)
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 | 41,432 | 6,501
12 Months or less, Unrealized Loss | (473) | (5)
More than 12 months, Fair Value | 2,014 | 126
More than 12 months, Unrealized Loss | (57) | (1)
Total Fair Value | 43,446 | 6,627
Total Unrealized Loss | (530) | (6)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 25,797 | 1,874
12 Months or less, Unrealized Loss | (107) | (1)
Total Fair Value | 25,797 | 1,874
Total Unrealized Loss | (107) | (1)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 141,327 | 5,755
12 Months or less, Unrealized Loss | (1,343) | (28)
More than 12 months, Fair Value | 3,123 |
More than 12 months, Unrealized Loss | (107) |
Total Fair Value | 144,450 | 5,755
Total Unrealized Loss | $ (1,450) | $ (28)

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