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Summary of Significant Accounting Policies - Provision for credit losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounting Policies [Abstract]
Provision (credit) for credit losses- loans	$ (8,326)	$ 6,589	$ (14,498)	$ 40,498
Provision (credit) for credit losses- AFS debt securities	123	18	89	156
Total provision (credit) for credit losses	$ (8,203)	$ 6,607	$ (14,409)	$ 40,654

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Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from change in present value of expected cash flows.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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