Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of PCI Loans and Lease Finance Receivables (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Real estate:
Less: Purchase accounting discount	$ 0
Gross PCI loans, net of discount	17,260		$ 36,548
Less: Allowance for PCI loan losses	(205)		(431)
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	459	$ 934
SBA	1,286	1,383
Real estate:
Commercial real estate	14,979	27,431
Construction	0	0
SFR mortgage	150	162
Dairy & livestock and agribusiness	200	770
Municipal lease finance receivables	0	0
Consumer and other loans	186	228
Gross PCI loans	17,260	30,908
Less: Purchase accounting discount	0	(2,026)
Gross PCI loans, net of discount	17,260	28,882	36,548
Less: Allowance for PCI loan losses	(205)	(367)	$ (431)
Net loans	$ 17,055	$ 28,515

Gross purchased credit impaired loans.

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Gross purchased credit impaired loans net of discount.

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Net loans.

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Loans receivable construction.

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The purchase accounting discount associated with loans acquired in an FDIC assisted acquisition.

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount before allowance of loans and leases issued to a unit or agency of a federal, state or local jurisdiction within the country of domicile of the reporting entity. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of consumer mortgage. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes subordinated loans such as home equity lines of credit and loans and leases covered under loss sharing agreements.

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Amount before allowance of consumer loans and leases not otherwise specified in the taxonomy. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of loans issued to agricultural institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements.

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Amount before allowance of mortgage loans on existing land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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Amount before allowance of commercial loans, including, but not limited to, letters of credit, bankers' acceptances, receivables factoring, open account financing, for international trade activities. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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