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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value |  | $ 14,638
12 Months or less, Unrealized Loss |  | (161)
More than 12 months, Fair Value | $ 31,517 | 82,692
More than 12 months, Unrealized Loss | (209) | (1,774)
Total Fair Value | 31,517 | 97,330
Total Unrealized Loss | (209) | (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 | 3,549 | 16,469
More than 12 months, Unrealized Loss | (22) | (140)
Total Fair Value | 3,549 | 16,469
Total Unrealized Loss | (22) | (140)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value |  | 8,008
12 Months or less, Unrealized Loss |  | (71)
More than 12 months, Fair Value | 2,882 | 25,890
More than 12 months, Unrealized Loss | (6) | (531)
Total Fair Value | 2,882 | 33,898
Total Unrealized Loss | (6) | (602)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value |  | 6,630
12 Months or less, Unrealized Loss |  | (90)
More than 12 months, Fair Value | 25,086 | 40,333
More than 12 months, Unrealized Loss | (181) | (1,103)
Total Fair Value | 25,086 | 46,963
Total Unrealized Loss | $ (181) | $ (1,193)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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