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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	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for loan losses:
Ending balance	$ 18,960	$ 15,961	$ 12,975	$ 10,338
Ending balance: individually evaluated for impairment	766	1,942	2,140
Ending balance: collectively evaluated for impairment	18,194	14,019	10,728
Loans receivable:
Ending balance	1,693,065	1,532,965	1,340,865
Ending balance: individually evaluated for impairment	9,705	11,242	10,267
Ending balance: collectively evaluated for impairment	1,682,343	1,519,386	1,328,230
Ending balance	1,017	2,337	2,368
Loans Acquired with Deteriorated Credit Quality
Allowance for loan losses:
Ending balance			107
Commercial
Allowance for loan losses:
Ending balance	5,052	3,799	3,042	2,321
Ending balance: individually evaluated for impairment	159	225	759
Ending balance: collectively evaluated for impairment	4,893	3,574	2,283
Loans receivable:
Ending balance	476,199	408,814	365,767
Ending balance: individually evaluated for impairment	2,121	1,724	1,196
Ending balance: collectively evaluated for impairment	473,736	406,127	363,620
Ending balance	342	963	951
Real estate Commercial
Allowance for loan losses:
Ending balance	7,548	5,847	4,245	3,037
Ending balance: individually evaluated for impairment	263	1,197	126
Ending balance: collectively evaluated for impairment	7,285	4,650	4,012
Loans receivable:
Ending balance	786,210	700,144	567,277
Ending balance: individually evaluated for impairment	3,644	5,820	4,006
Ending balance: collectively evaluated for impairment	781,921	692,987	561,903
Ending balance	645	1,337	1,368
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality
Allowance for loan losses:
Ending balance			107
Consumer
Allowance for loan losses:
Ending balance	1,380	1,608	1,583	$ 1,290
Ending balance: individually evaluated for impairment	8		117
Ending balance: collectively evaluated for impairment	1,372	1,608	1,466
Loans receivable:
Ending balance	142,721	134,226	101,603
Ending balance: individually evaluated for impairment	177	155	148
Ending balance: collectively evaluated for impairment	$ 142,544	$ 134,071	101,455
Unallocated
Allowance for loan losses:
Ending balance			23
Ending balance: collectively evaluated for impairment			$ 23

X

- 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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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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