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Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 16, 2019	Jan. 01, 2019	Dec. 31, 2018	Mar. 15, 2018
Schedule Of Accounting Policies [Line Items]
Shares, non-dilutive	340,540	0	340,540	0
Reclassifications effect on net income				$ 0
Common stock, par value	$ 0		$ 0				$ 0	$ 0
Operating Lease, Liability	$ 3,014		$ 3,014
Operating Lease, Right-of-Use Asset						$ 3,500
Number of shares authorized to be repurchased					2,250,000
Number of shares repurchased			99,407
Average price per share repurchased			$ 16.04
Accounting Standards Update 2016-02 [Member]
Schedule Of Accounting Policies [Line Items]
Operating Lease, Liability						3,500
Operating Lease, Right-of-Use Asset						$ 3,500

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Schedule Of Accounting Policies [Line Items]

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Face amount per share of no-par value common stock.

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Amount of the effect of a change in accounting principle on net income.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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