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Loans, net and allowance for loan losses - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan
Net deferred loan costs	$ 579	$ 690
Loans outstanding to directors, executive officers, principal stockholders or to their affiliates	15,614	10,187
Advances and repayments of loans receivable	7,862	2,435
Interest income recognized using the cash-basis method on impaired loans	$ 0	$ 0	$ 0
Number of distressed loans | loan	10	29	29
Credit adjustment on distressed loans	$ 1,647	$ 6,892	$ 6,892
Total impaired loans	13,579	12,635	14,591
Commercial
Total impaired loans	2,687	2,147	3,948
Real estate Commercial
Total impaired loans	7,157	5,374	6,457
Real estate Residential
Total impaired loans	3,580	4,966	4,059
Consumer
Total impaired loans	$ 155	$ 148	$ 127

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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Publisher FASB
-Name Accounting Standards Codification
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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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The cash inflow associated with the collection, including prepayments, of loans receivable issued for financing of goods and services.

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