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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 USD ($) contract	Dec. 31, 2015 USD ($) contract
Loans in the formal process of foreclosure	$ 1,684,000	$ 1,529,000
Number of loans modified | contract	6	3	9
Pre-Modification Outstanding Recorded Investment	$ 1,670,000	$ 1,716,000
Post-Modification Outstanding Recorded Investment	1,670,000	1,366,000
Recorded Investment	1,628,000	1,357,000
Number of defaults on loans restructured		1	$ 2
Loans modified as troubled debt restructuring		43,000	166,000
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk	$ 3,074,000	$ 1,909,000	$ 2,861,000
Commercial
Number of loans modified | contract	2	1
Pre-Modification Outstanding Recorded Investment	$ 885,000	$ 1,500,000
Post-Modification Outstanding Recorded Investment	885,000	1,150,000
Recorded Investment	$ 864,000	$ 1,150,000
Real estate Commercial
Number of loans modified | contract	3
Pre-Modification Outstanding Recorded Investment	$ 721,000
Post-Modification Outstanding Recorded Investment	721,000
Recorded Investment	$ 700,000
Real estate Residential
Number of loans modified | contract	1	2
Pre-Modification Outstanding Recorded Investment	$ 64,000	$ 216,000
Post-Modification Outstanding Recorded Investment	64,000	216,000
Recorded Investment	$ 64,000	$ 207,000

X

- Definition

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

+ References

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Reflects the amount of the write-down related to a troubled debt restructuring.

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-Publisher FASB
-Name Accounting Standards Codification
-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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-Name Accounting Standards Codification
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