Allowance for credit losses - T D R that subsequently defaulted (Details) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) loans	Mar. 31, 2020 USD ($) loans
Financing Receivable
Loan count \| loans	73	195
Recorded investment as of first default date \| $	$ 6,505	$ 6,432
Mortgages
Financing Receivable
Loan count \| loans	23	39
Recorded investment as of first default date \| $	$ 1,732	$ 4,482
Commercial \| CRE owner occupied
Financing Receivable
Loan count \| loans	2	2
Recorded investment as of first default date \| $	$ 3,754	$ 243
Commercial \| Commercial and Industrial
Financing Receivable
Loan count \| loans	2	2
Recorded investment as of first default date \| $	$ 224	$ 40
Consumer \| Credit cards
Financing Receivable
Loan count \| loans	40	106
Recorded investment as of first default date \| $	$ 535	$ 859
Consumer \| Personal loans
Financing Receivable
Loan count \| loans	6	45
Recorded investment as of first default date \| $	$ 260	$ 808
Consumer \| Other
Financing Receivable
Loan count \| loans		1
Recorded investment as of first default date \| $		$ 0

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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