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Basis of presentation - Additional Information (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) branch	Dec. 31, 2019 USD ($)	Nov. 06, 2020 USD ($)
Class of Stock [Line Items]
Number of full-service branches \| branch	87
Loans processed	$ 310,719
Stockholders' equity	1,244,998	$ 762,329
90 Day Fixed Rate Advance
Class of Stock [Line Items]
Repayments of advances	100,000	100,000
90 Day Fixed Rate Advance \| Subsequent Event
Class of Stock [Line Items]
Amount not elected for renewal			$ 100,000
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Class of Stock [Line Items]
Stockholders' equity	$ 545	$ 955

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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