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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 12,162 | $ 12,600
12 Months or less, Unrealized Loss | (118) | (112)
More than 12 months, Fair Value | 150 | 11,140
More than 12 months, Unrealized Loss | (1) | (57)
Total Fair Value | 12,312 | 23,740
Total Unrealized Loss | (119) | (169)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
More than 12 months, Fair Value | 150 | 3,408
More than 12 months, Unrealized Loss | (1) | (4)
Total Fair Value | 150 | 3,408
Total Unrealized Loss | (1) | (4)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 3,586 | 1,947
12 Months or less, Unrealized Loss | (83) | (21)
Total Fair Value | 3,586 | 1,947
Total Unrealized Loss | (83) | (21)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 8,576 | 10,653
12 Months or less, Unrealized Loss | (35) | (91)
More than 12 months, Fair Value |  | 7,732
More than 12 months, Unrealized Loss |  | (53)
Total Fair Value | 8,576 | 18,385
Total Unrealized Loss | $ (35) | $ (144)

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