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Summary of Significant Accounting Policies - Provision for credit losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Summary of Significant Accounting Policies
Provision for credit losses- loans	$ 19,599		$ 33,909
Provision for credit losses- AFS debt securities	138		138
Total provision for credit losses	$ 19,737	$ 3,600	$ 34,047	$ 6,960

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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

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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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