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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 12,600 | $ 14,638
12 Months or less, Unrealized Loss | (112) | (161)
More than 12 months, Fair Value | 11,140 | 82,692
More than 12 months, Unrealized Loss | (57) | (1,774)
Total Fair Value | 23,740 | 97,330
Total Unrealized Loss | (169) | (1,935)
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 | 3,408 | 16,469
More than 12 months, Unrealized Loss | (4) | (140)
Total Fair Value | 3,408 | 16,469
Total Unrealized Loss | (4) | (140)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 1,947 | 8,008
12 Months or less, Unrealized Loss | (21) | (71)
More than 12 months, Fair Value |  | 25,890
More than 12 months, Unrealized Loss |  | (531)
Total Fair Value | 1,947 | 33,898
Total Unrealized Loss | (21) | (602)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 10,653 | 6,630
12 Months or less, Unrealized Loss | (91) | (90)
More than 12 months, Fair Value | 7,732 | 40,333
More than 12 months, Unrealized Loss | (53) | (1,103)
Total Fair Value | 18,385 | 46,963
Total Unrealized Loss | $ (144) | $ (1,193)

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