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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 8,339 | $ 8,186
Accumulated Amortization | 7,060 | 6,402
Net Carrying Amount | 1,279 | 1,784
MSRs [Member] |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,065 | 912
Accumulated Amortization | 322 | 250
Net Carrying Amount | 743 | 662
Core deposit intangibles [Member] |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 7,274 | 7,274
Accumulated Amortization | 6,738 | 6,152
Net Carrying Amount | $ 536 | $ 1,122

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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