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Commitments and contingencies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Stockholders' equity	$ 805,216	$ 718,759	$ 805,216	$ 718,759	$ 782,330	$ 762,329	$ 694,577	$ 671,857
Total principal amount of loans repurchased or indemnified	1,568	2,117	4,367	3,510
Period of adoption, adjustment
Loss Contingencies [Line Items]
Stockholders' equity						(25,018)		(1,309)
Unfunded Commitments
Loss Contingencies [Line Items]
Initial recognition of allowance for credit losses					0	2,947
Retained earnings
Loss Contingencies [Line Items]
Stockholders' equity	$ 286,296	$ 253,080	$ 286,296	$ 253,080	$ 266,385	293,524	$ 236,947	221,213
Retained earnings \| Period of adoption, adjustment
Loss Contingencies [Line Items]
Stockholders' equity						$ (25,018)		$ (1,309)

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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