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Premises and Equipment - Additional Information (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) Renewal_Terms Lease | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Depreciation on premises and equipment | $ 3,811 | $ 3,215 | $ 2,759
Rental expense, net of rental income | $ 870 | 773 | 699
Sale leaseback transaction, lease term | 17 years |  |
Sale leaseback transaction, number of automatic renewals | Renewal_Terms | 2 |  |
Sale leaseback transaction, two automatic lease renewal, period | 5 years |  |
Sale leaseback transaction, sale of property, amount | $ 1,200 |  |
Sale leaseback transaction, deferred gain | 489 |  |
Sale leaseback transaction, gain recognized | $ 25 | $ 25 | $ 22
Facilities [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Non-cancelable operating leases having remaining term less than one year | Lease | 19 |  |
Vehicles [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Non-cancelable operating leases having remaining term less than one year | Lease | 11 |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition The portion of the deferred gain that was recognized in the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77907795&loc=d3e50609-112754 + Details
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- Definition The portion of the gain that will be recorded as income or a reduction in rent expense in future periods less amounts recognized in the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77907795&loc=d3e50609-112754 + Details
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