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Loans, net and allowance for loan losses - Net Deferred Loan Costs (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan
Loans, net and allowance for loan losses
Net deferred loan costs	$ 575,000	$ 579,000
Loans outstanding to directors, executive officers, principal stockholders or to their affiliates	15,169,000	15,614,000
Advances and repayments of loans receivable	1,133,000	1,578,000
Number of related party loans classified as nonaccrual, past due, or restructured	0	0
Donations to community foundation	1,100,000	900,000
Deposits from related parties	10,000,000	9,300,000
Interest income recognized using the cash-basis method on impaired loans	$ 0	$ 0	$ 0
Number of distressed loans | loan	9		29	29
Credit adjustment on distressed loans	$ 1,430,000		$ 6,892,000	$ 6,892,000

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Amount of noninterest expense classified as donations to a community foundation.

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Credit adjustment on distressed loans deemed impaired.

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- Definition

Net deferred loan costs included in loan balances.

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Number of distressed loans which are securities experiencing financial or operational distress or default.

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Number of related party loans classified as nonaccrual, past due, or restructured.

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- Definition

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
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(e))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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