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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 USD ($) contract	Dec. 31, 2019 USD ($)
Number of loans modified | contract		4	1
Pre-Modification Outstanding Recorded Investment		$ 1,085,000	$ 340,000
Post-Modification Outstanding Recorded Investment		1,085,000	300,000
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk	$ 2,262,000	$ 3,004,000	$ 2,262,000	$ 2,193,000
Real estate Commercial
Number of loans modified | contract		3	1
Pre-Modification Outstanding Recorded Investment		$ 1,073,000	$ 340,000
Post-Modification Outstanding Recorded Investment		$ 1,073,000	300,000
Recorded Investment	335,000		335,000
Number of defaults on loans restructured			$ 2
Loan repaid	332,000
Real estate Residential
Number of defaults on loans restructured | contract		1
Recorded Investment		$ 52,000
Number of defaults on loans restructured	$ 0
Commercial and Industrial
Number of loans modified | contract		1
Pre-Modification Outstanding Recorded Investment		$ 12,000
Post-Modification Outstanding Recorded Investment		$ 12,000

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

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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Amount, before troubled debt restructuring, of financing receivable to be modified.

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