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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 224,382 | $ 192,820
Gross Unrealized Gains | 5,705 | 4,292
Gross Unrealized Losses | (668) | (1,248)
Total securities available for sale, Fair Value | 229,419 | 195,864
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 30,972 | 37,406
Gross Unrealized Gains | 178 | 117
Gross Unrealized Losses | (87) | (77)
Total securities available for sale, Fair Value | 31,063 | 37,446
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 109,443 | 92,177
Gross Unrealized Gains | 4,397 | 3,395
Gross Unrealized Losses | (225) | (574)
Total securities available for sale, Fair Value | 113,615 | 94,998
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 83,486 | 62,756
Gross Unrealized Gains | 793 | 483
Gross Unrealized Losses | (356) | (597)
Total securities available for sale, Fair Value | 83,923 | 62,642
Total Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 223,901 | 192,339
Gross Unrealized Gains | 5,368 | 3,995
Gross Unrealized Losses | (668) | (1,248)
Total securities available for sale, Fair Value | 228,601 | 195,086
Equity Securities in Financial Institutions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 481 | 481
Gross Unrealized Gains | 337 | 297
Total securities available for sale, Fair Value | $ 818 | $ 778

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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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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