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Securities - Debt Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 65,891 | $ 55,659
12 Months or less, Unrealized Loss | (1,185) | (304)
More than 12 months, Fair Value | 4,261 | 7,642
More than 12 months, Unrealized Loss | (63) | (130)
Total Fair Value | 70,152 | 63,301
Total Unrealized Loss | (1,248) | (434)
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 | 13,271 | 25,464
12 Months or less, Unrealized Loss | (61) | (112)
More than 12 months, Fair Value | 893 | 1,132
More than 12 months, Unrealized Loss | (16) | (17)
Total Fair Value | 14,164 | 26,596
Total Unrealized Loss | (77) | (129)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 17,167 | 2,932
12 Months or less, Unrealized Loss | (558) | (20)
More than 12 months, Fair Value | 519 | 1,469
More than 12 months, Unrealized Loss | (16) | (42)
Total Fair Value | 17,686 | 4,401
Total Unrealized Loss | (574) | (62)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 35,453 | 27,263
12 Months or less, Unrealized Loss | (566) | (172)
More than 12 months, Fair Value | 2,849 | 5,041
More than 12 months, Unrealized Loss | (31) | (71)
Total Fair Value | 38,302 | 32,304
Total Unrealized Loss | $ (597) | $ (243)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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