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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, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for loan losses:
Ending balance	$ 15,961	$ 12,975	$ 10,338	$ 8,651
Ending balance: individually evaluated for impairment	1,942	2,140	2,682
Ending balance: collectively evaluated for impairment	14,019	10,728	7,379
Loans receivable:
Ending balance	1,532,965	1,340,865	1,209,894
Ending balance: individually evaluated for impairment	11,242	10,267	11,807
Ending balance: collectively evaluated for impairment	1,519,386	1,328,230	1,195,303
Ending balance	2,337	2,368	2,784
Loans Acquired with Deteriorated Credit Quality
Allowance for loan losses:
Ending balance		107	277
Commercial
Allowance for loan losses:
Ending balance	3,799	3,042	2,321	2,008
Ending balance: individually evaluated for impairment	225	759	1,072
Ending balance: collectively evaluated for impairment	3,574	2,283	1,081
Loans receivable:
Ending balance	408,814	365,767	319,590
Ending balance: individually evaluated for impairment	1,724	1,196	2,595
Ending balance: collectively evaluated for impairment	406,127	363,620	315,642
Ending balance	963	951	1,353
Commercial | Loans Acquired with Deteriorated Credit Quality
Allowance for loan losses:
Ending balance			168
Real estate Commercial
Allowance for loan losses:
Ending balance	5,847	4,245	3,037	2,394
Ending balance: individually evaluated for impairment	1,197	126	805
Ending balance: collectively evaluated for impairment	4,650	4,012	2,125
Loans receivable:
Ending balance	700,144	567,277	493,481
Ending balance: individually evaluated for impairment	5,820	4,006	5,084
Ending balance: collectively evaluated for impairment	692,987	561,903	487,024
Ending balance	1,337	1,368	1,373
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality
Allowance for loan losses:
Ending balance		107	107
Consumer
Allowance for loan losses:
Ending balance	1,608	1,583	1,290	$ 1,114
Ending balance: individually evaluated for impairment		117	38
Ending balance: collectively evaluated for impairment	1,608	1,466	1,252
Loans receivable:
Ending balance	134,226	101,603	74,369
Ending balance: individually evaluated for impairment	155	148	127
Ending balance: collectively evaluated for impairment	$ 134,071	101,455	$ 74,242
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=49124121&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=49124121&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=49124121&loc=SL6953423-111524

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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=49124121&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=28367877&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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