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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets, Other than Goodwill (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 8,408 | $ 8,339
Accumulated Amortization | 7,161 | 7,060
Net Carrying Amount | 1,247 | 1,279
MSRs [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,134 | 1,065
Accumulated Amortization | 364 | 322
Net Carrying Amount | 770 | 743
Core deposit intangibles [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 7,274 | 7,274
Accumulated Amortization | 6,797 | 6,738
Net Carrying Amount | $ 477 | $ 536

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