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Loans, net and allowance for loan losses - Allocation of Allowance for Loan Losses and Related Loans by Major Classification of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Allowance for loan losses:
Ending balance	$ 19,718	$ 18,960	$ 16,969	$ 15,961
Ending balance: individually evaluated for impairment	1,755	766
Ending balance: collectively evaluated for impairment	17,963	18,194
Loans receivable:
Ending balance	1,725,781	1,693,065
Ending balance: individually evaluated for impairment	10,727	9,705
Ending balance: collectively evaluated for impairment	1,714,116	1,682,343
Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	938	1,017
Commercial
Allowance for loan losses:
Ending balance	5,406	5,052	4,129	3,799
Ending balance: individually evaluated for impairment	145	159
Ending balance: collectively evaluated for impairment	5,261	4,893
Loans receivable:
Ending balance	467,404	476,199
Ending balance: individually evaluated for impairment	2,023	2,121
Ending balance: collectively evaluated for impairment	465,060	473,736
Commercial | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	321	342
Real estate Commercial
Allowance for loan losses:
Ending balance	8,099	7,548	6,291	5,847
Ending balance: individually evaluated for impairment	1,411	263
Ending balance: collectively evaluated for impairment	6,688	7,285
Loans receivable:
Ending balance	833,497	786,210
Ending balance: individually evaluated for impairment	4,784	3,644
Ending balance: collectively evaluated for impairment	828,125	781,921
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	588	645
Real estate Residential
Allowance for loan losses:
Ending balance	4,839	4,980
Ending balance: individually evaluated for impairment	182	336
Ending balance: collectively evaluated for impairment	4,657	4,644
Loans receivable:
Ending balance	289,367	287,935
Ending balance: individually evaluated for impairment	3,751	3,763
Ending balance: collectively evaluated for impairment	285,587	284,142
Real estate Residential | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	29	30
Consumer
Allowance for loan losses:
Ending balance	1,374	1,380	$ 1,571	$ 1,608
Ending balance: individually evaluated for impairment	17	8
Ending balance: collectively evaluated for impairment	1,357	1,372
Loans receivable:
Ending balance	135,513	142,721
Ending balance: individually evaluated for impairment	169	177
Ending balance: collectively evaluated for impairment	$ 135,344	$ 142,544

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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
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