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Premises and Equipment - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2009 USD ($) renewal_term | Dec. 31, 2018 USD ($) lease | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation on premises and equipment |  | $ 3,706 | $ 3,811 | $ 3,215
Rental expense, net of rental income |  | 932 | 870 | 773
Sale leaseback transaction, lease term | 17 years |  |  |
Sale leaseback transaction, number of automatic renewals | renewal_term | 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 |  | $ 26 | $ 25 | $ 25
Facilities |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Non-cancelable operating leases having remaining term less than one year | lease |  | 28 |  |
Vehicles |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Non-cancelable operating leases having remaining term less than one year | lease |  | 6 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108788860&loc=d3e50609-112754 + Details
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