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Securities - Summary of Amortized Costs and Fair Values of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total | $ 113,098 | $ 83,494
Securities available for sale, Gross Unrealized Gains | 548 | 704
Securities available for sale, Gross Unrealized (Losses) | (1,178) | (906)
Securities available for sale, Fair Value | 112,468 | 83,292
Securities held to maturity, Amortized Cost | 37,343 |
Securities held to maturity, Gross Unrealized Gains | 2 |
Securities held to maturity, Gross Unrealized (Losses) | (494) |
Securities held to maturity, Fair Value | 36,851 | 0
Total securities, Amortized Cost | 150,441 |
Total securities, Gross Unrealized Gains | 550 |
Total securities, Gross Unrealized Gains | (1,672) |
Total securities, Fair Value | 149,319 |
U.S. Agency and Mortgage-Backed Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total | 97,013 | 67,462
Securities available for sale, Gross Unrealized Gains | 289 | 374
Securities available for sale, Gross Unrealized (Losses) | (1,082) | (807)
Securities available for sale, Fair Value | 96,220 | 67,029
Securities held to maturity, Amortized Cost | 30,376 |
Securities held to maturity, Gross Unrealized (Losses) | (404) |
Securities held to maturity, Fair Value | 29,972 |
Obligations of States and Political Subdivisions [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total | 16,084 | 16,031
Securities available for sale, Gross Unrealized Gains | 253 | 325
Securities available for sale, Gross Unrealized (Losses) | (96) | (99)
Securities available for sale, Fair Value | 16,241 | 16,257
Securities held to maturity, Amortized Cost | 6,967 |
Securities held to maturity, Gross Unrealized Gains | 2 |
Securities held to maturity, Gross Unrealized (Losses) | (90) |
Securities held to maturity, Fair Value | 6,879 |
Corporate Equity Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available-for-sale Securities, Debt and Equity, Amortized Cost Basis, Total | 1 | 1
Securities available for sale, Gross Unrealized Gains | 6 | 5
Securities available for sale, Fair Value | $ 7 | $ 6

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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=27724398&loc=d3e27161-111563 + Details
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