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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) contract	Jun. 30, 2019 USD ($) contract	Jun. 30, 2020 USD ($) contract	Jun. 30, 2019 USD ($) contract	Dec. 31, 2019 USD ($)
Number of loans modified | contract	4	4		1
Pre-Modification Outstanding Recorded Investment	$ 1,085,000	$ 1,085,000		$ 340,000
Post-Modification Outstanding Recorded Investment	1,085,000	1,085,000		300,000
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk	$ 3,168,000	$ 2,677,000	$ 3,168,000	$ 2,677,000	$ 2,193,000
Real estate Commercial
Number of loans modified | contract	3	3		1
Pre-Modification Outstanding Recorded Investment	$ 1,073,000	$ 1,073,000		$ 340,000
Post-Modification Outstanding Recorded Investment	$ 1,073,000	1,073,000		300,000
Recorded Investment		335,000		335,000
Number of defaults on loans restructured		$ 2		$ 2
Commercial and Industrial
Number of loans modified | contract	1	1
Pre-Modification Outstanding Recorded Investment	$ 12,000	$ 12,000
Post-Modification Outstanding Recorded Investment	12,000	$ 12,000
Real estate Residential
Number of defaults on loans restructured | contract			1
Recorded Investment	$ 52,000		$ 52,000
Number of defaults on loans restructured			$ 0

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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

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=118936363&loc=SL6953676-111524

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

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Topic 310
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-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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