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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	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Allowance for loan losses:
Ending balance	$ 18,831	$ 17,802	$ 15,961	$ 15,712	$ 14,799	$ 12,975
Ending balance: individually evaluated for impairment	1,706		1,942
Ending balance: collectively evaluated for impairment	17,125		14,019
Loans receivable:
Ending balance	1,632,515		1,532,965
Ending balance: individually evaluated for impairment	10,742		11,242
Ending balance: collectively evaluated for impairment	1,620,743		1,519,386
Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	1,030		2,337
Commercial
Allowance for loan losses:
Ending balance	4,770	4,426	3,799	3,586	3,263	3,042
Ending balance: individually evaluated for impairment	436		225
Ending balance: collectively evaluated for impairment	4,334		3,574
Loans receivable:
Ending balance	449,464		408,814
Ending balance: individually evaluated for impairment	2,789		1,724
Ending balance: collectively evaluated for impairment	446,322		406,127
Commercial | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	353		963
Real estate Commercial
Allowance for loan losses:
Ending balance	7,194	6,587	5,847	5,581	5,077	4,245
Ending balance: individually evaluated for impairment	631		1,197
Ending balance: collectively evaluated for impairment	6,563		4,650
Loans receivable:
Ending balance	751,510		700,144
Ending balance: individually evaluated for impairment	4,062		5,820
Ending balance: collectively evaluated for impairment	746,802		692,987
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	646		1,337
Real estate Residential
Loans receivable:
Ending balance	289,582		289,781
Consumer
Allowance for loan losses:
Ending balance	1,574	$ 1,593	1,608	1,669	1,679	1,583
Ending balance: individually evaluated for impairment	23
Ending balance: collectively evaluated for impairment	1,551		1,608
Loans receivable:
Ending balance	141,959		134,226
Ending balance: individually evaluated for impairment	194		155
Ending balance: collectively evaluated for impairment	$ 141,765		$ 134,071
Unallocated
Allowance for loan losses:
Ending balance				$ 315	$ 315	$ 23

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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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-Publisher FASB
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+ References

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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

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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-Name Accounting Standards Codification
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