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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 192,820 | $ 190,863
Gross Unrealized Gains | 4,292 | 5,820
Gross Unrealized Losses | (1,248) | (434)
Total securities available for sale, Fair Value | 195,864 | 196,249
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 37,406 | 40,992
Gross Unrealized Gains | 117 | 74
Gross Unrealized Losses | (77) | (129)
Total securities available for sale, Fair Value | 37,446 | 40,937
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 92,177 | 87,255
Gross Unrealized Gains | 3,395 | 4,959
Gross Unrealized Losses | (574) | (62)
Total securities available for sale, Fair Value | 94,998 | 92,152
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 62,756 | 62,135
Gross Unrealized Gains | 483 | 681
Gross Unrealized Losses | (597) | (243)
Total securities available for sale, Fair Value | 62,642 | 62,573
Total Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 192,339 | 190,382
Gross Unrealized Gains | 3,995 | 5,714
Gross Unrealized Losses | (1,248) | (434)
Total securities available for sale, Fair Value | 195,086 | 195,662
Equity Securities in Financial Institutions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 481 | 481
Gross Unrealized Gains | 297 | 106
Total securities available for sale, Fair Value | $ 778 | $ 587

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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