Organization and Summary of Significant Accounting Policies (Accumulated Balances Related Component of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 57,182	$ 55,466
Ending balance	75,622	57,182
Unrealized Gains and Losses on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(523)	(574)
Other comprehensive income (loss) before reclassifications	(402)	296
Amounts reclassified from accumulated other comprehensive loss	(4)	(160)
Amounts reclassified to retained earnings from other comprehensive loss due to tax rate change		(85)
Ending balance	(929)	(523)
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(987)	(780)
Other comprehensive income (loss) before reclassifications	(51)	(44)
Amounts reclassified to retained earnings from other comprehensive loss due to tax rate change		(163)
Ending balance	(1,038)	(987)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,510)	(1,354)
Other comprehensive income (loss) before reclassifications	(453)	252
Amounts reclassified from accumulated other comprehensive loss	(4)	(160)
Amounts reclassified to retained earnings from other comprehensive loss due to tax rate change		(248)
Ending balance	$ (1,967)	$ (1,510)

Tax Cuts and Jobs Act of 2017, reclassification from AOCI to retained earnings tax effect.

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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 tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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