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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) loan contract	Dec. 31, 2018 USD ($) loan contract	Dec. 31, 2017 USD ($) loan	Dec. 31, 2017 USD ($) contract	Dec. 31, 2017 USD ($)
Loans in the formal process of foreclosure	$ 665,000	$ 1,823,000
Number of loans modified	1	1	6	6
Pre-Modification Outstanding Recorded Investment					$ 1,670,000
Post-Modification Outstanding Recorded Investment					1,670,000
Recorded Investment			$ 1,628,000	$ 1,628,000	1,628,000
Number of defaults on loans restructured	$ 0	$ 0			0
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk	$ 2,193,000	$ 2,779,000
Commercial
Number of loans modified | contract				2
Pre-Modification Outstanding Recorded Investment					885,000
Post-Modification Outstanding Recorded Investment					885,000
Recorded Investment			864,000	$ 864,000	864,000
Real estate Commercial
Number of loans modified | contract	1	1		3
Pre-Modification Outstanding Recorded Investment	$ 346,000	$ 340,000			721,000
Post-Modification Outstanding Recorded Investment	346,000	340,000			721,000
Recorded Investment	$ 241,000	$ 340,000	700,000	$ 700,000	700,000
Real estate Residential
Number of loans modified | contract				1
Pre-Modification Outstanding Recorded Investment					64,000
Post-Modification Outstanding Recorded Investment					64,000
Recorded Investment			$ 64,000	$ 64,000	$ 64,000

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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, after troubled debt restructuring, of modified financing receivable.

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-Topic 310
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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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