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Securities - Available for Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 227,031 | $ 192,820
Gross Unrealized Gains | 5,085 | 4,292
Gross Unrealized Losses | (1,054) | (1,248)
Fair Value | 231,062 | 195,864
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 30,450 | 37,406
Gross Unrealized Gains | 100 | 117
Gross Unrealized Losses | (192) | (77)
Fair Value | 30,357 | 37,446
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 114,002 | 92,177
Gross Unrealized Gains | 4,226 | 3,395
Gross Unrealized Losses | (172) | (574)
Fair Value | 118,056 | 94,998
Mortgage-back Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 82,098 | 62,756
Gross Unrealized Gains | 408 | 483
Gross Unrealized Losses | (690) | (597)
Fair Value | 81,817 | 62,642
Total Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 226,550 | 192,339
Gross Unrealized Gains | 4,734 | 3,995
Gross Unrealized Losses | (1,054) | (1,248)
Fair Value | 230,230 | 195,086
Equity Securities in Financial Institutions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 481 | 481
Gross Unrealized Gains | 351 | 297
Fair Value | $ 832 | $ 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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- 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=82897076&loc=d3e27161-111563 + Details
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