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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) loan customer	Mar. 31, 2020 USD ($) contract loan	Dec. 31, 2020 USD ($)
Number of loans modified | loan	0	0
Number of defaults on loans restructured	$ 0
Number of business loans with payment deferrals granted | customer	6
Loan receivable balances where payment deferrals were granted	$ (4,800)		$ 6,100
Outstanding loan balance in deferral	1,300
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk	$ 2,740	$ 2,140	$ 2,818
Maximum
Percentage of total loan portfolio	0.10%
Real estate Residential
Number of defaults on loans restructured | contract		1
Recorded Investment		$ 52

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- Definition

Percentage of financing receivable modified by loan deferrals of total loan portfolio.

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- Definition

Amount of financing receivable loan deferral principal balance.

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- Definition

The value of loan receivable balances where payment deferrals have been granted.

+ References

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- Definition

The number of business relationships where payment deferrals were granted.

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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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- Definition

Represents the number of defaults on loans restructured.

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- Definition

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 of financing receivable modified as troubled debt restructuring.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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- Definition

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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