Servicing rights - Assumptions (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Freddie Mac
Adverse changes to key assumptions on the carrying amount of the servicing rights
Prepayment rate (10% adverse change)	$ (369)	$ (285)
Prepayment rate (20% adverse change)	(722)	(558)
Default rate (10% adverse change)	(6)	(5)
Default rate (20% adverse change)	(12)	(10)
Discount rate (10% adverse change)	(470)	(381)
Discount rate (20% adverse change)	(920)	(746)
SBA
Adverse changes to key assumptions on the carrying amount of the servicing rights
Prepayment rate (10% adverse change)	(587)	(563)
Prepayment rate (20% adverse change)	(1,143)	(1,097)
Default rate (10% adverse change)	(102)	(94)
Default rate (20% adverse change)	(204)	(186)
Discount rate (10% adverse change)	(446)	(520)
Discount rate (20% adverse change)	$ (870)	$ (1,011)

The hypothetical financial impact of a 10 percent adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107314-111719

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The hypothetical financial impact of a 10 percent adverse change of the expected credit losses, including expected static pool losses, on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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- Definition

The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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The hypothetical financial impact of a 20 percent adverse change of the discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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The hypothetical financial impact of a 20 percent adverse change of the expected credit, including expected static pool losses, on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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The hypothetical financial impact of a 20 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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