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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 109,034 | $ 14,130
12 Months or less, Unrealized Loss | (455) | (34)
More than 12 months, Fair Value | 2,633 | 126
More than 12 months, Unrealized Loss | (57) | (1)
Total Fair Value | 111,667 | 14,256
Total Unrealized Loss | (512) | (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 | 25,292 | 6,501
12 Months or less, Unrealized Loss | (151) | (5)
More than 12 months, Fair Value |  | 126
More than 12 months, Unrealized Loss |  | (1)
Total Fair Value | 25,292 | 6,627
Total Unrealized Loss | (151) | (6)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 6,428 | 1,874
12 Months or less, Unrealized Loss | (65) | (1)
Total Fair Value | 6,428 | 1,874
Total Unrealized Loss | (65) | (1)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 77,314 | 5,755
12 Months or less, Unrealized Loss | (239) | (28)
More than 12 months, Fair Value | 2,633 |
More than 12 months, Unrealized Loss | (57) |
Total Fair Value | 79,947 | 5,755
Total Unrealized Loss | $ (296) | $ (28)

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