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Premises and Equipment - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Impairment loss				$ 2,600,000
Fair value, net of selling costs, of held-for-sale asset				3,400,000
Gain on eminent domain condemnation		$ 0	$ 2,894,000
Gain on sale of property plant equipment	$ 542,000
Premises and equipment, net		58,193,000	46,166,000
Rental expense		$ 7,700,000	5,900,000	$ 5,600,000
Building [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, net			$ 450,000

X

- Definition

Fair value portion of assets classified as held for sale.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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- Definition

The gain (loss) is the pre-tax difference between the net condemnation award and the entity's adjusted basis of the condemned property.

+ References

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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