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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) contract	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan contract	Dec. 31, 2020 USD ($)
Number of loans | loan	0		0	4
Pre-Modification Recorded Investment				$ 1,085
Post-Modification Recorded Investment				1,085
Number of defaults on loans restructured	$ 0		$ 0
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk	$ 2,560	$ 3,004	$ 2,560	$ 3,004	$ 2,818
Real estate Commercial
Number of loans | loan				3
Pre-Modification Recorded Investment				$ 1,073
Post-Modification Recorded Investment				$ 1,073
Real estate Residential
Number of defaults on loans restructured | contract		1		1
Recorded Investment		$ 52		$ 52
Commercial and Industrial
Number of loans | loan				1
Pre-Modification Recorded Investment				$ 12
Post-Modification Recorded Investment				$ 12

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- Definition

Loans made to related parties which are considered nonaccrual, past due, restructured or a potential credit risk.

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Represents the number of defaults on loans restructured.

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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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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