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Business Description - Additional Information (Details) $ / shares in Units, $ in Thousands			9 Months Ended	55 Months Ended
	Jul. 31, 2017 $ / shares shares	Jul. 27, 2017 $ / shares shares	Sep. 30, 2017 USD ($) shares	Feb. 19, 2016 Acquisition	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Description Of Business [Line Items]
Total assets			$ 1,642,714		$ 1,395,551
Gross loans			1,196,522		1,110,446
Total deposits			1,318,292		1,152,763
Total stockholders' Equity			$ 260,331		$ 181,585	$ 176,433	$ 163,645
Number of acquisitions | Acquisition				4
Initial Public Offering
Description Of Business [Line Items]
Number of shares issued in offering | shares	3,750,000	3,750,000	3,000,000
Share price per share | $ / shares	$ 23.00	$ 23.00

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Description of business.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. 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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The number of businesses acquired by the entity during the period.

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Price of a single share of a number of saleable stocks of a company.

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Number of new stock issued during the period.

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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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