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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	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Allowance for loan losses:
Ending balance	$ 19,573	$ 19,718	$ 18,960	$ 17,802	$ 16,969	$ 15,961
Ending balance: individually evaluated for impairment	1,029		766
Ending balance: collectively evaluated for impairment	18,544		18,194
Loans receivable:
Ending balance	1,753,389		1,693,065
Ending balance: individually evaluated for impairment	9,637		9,705
Ending balance: collectively evaluated for impairment	1,742,847		1,682,343
Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	905		1,017
Commercial
Allowance for loan losses:
Ending balance	5,749	5,406	5,052	4,426	4,129	3,799
Ending balance: individually evaluated for impairment	146		159
Ending balance: collectively evaluated for impairment	5,603		4,893
Loans receivable:
Ending balance	469,318		476,199
Ending balance: individually evaluated for impairment	1,972		2,121
Ending balance: collectively evaluated for impairment	467,035		473,736
Commercial | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	311		342
Real estate Commercial
Allowance for loan losses:
Ending balance	7,506	8,099	7,548	6,587	6,291	5,847
Ending balance: individually evaluated for impairment	502		263
Ending balance: collectively evaluated for impairment	7,004		7,285
Loans receivable:
Ending balance	867,349		786,210
Ending balance: individually evaluated for impairment	4,060		3,644
Ending balance: collectively evaluated for impairment	862,723		781,921
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	566		645
Real estate Residential
Allowance for loan losses:
Ending balance	4,962	4,839	4,980	5,196	4,978	4,707
Ending balance: individually evaluated for impairment	378		336
Ending balance: collectively evaluated for impairment	4,584		4,644
Loans receivable:
Ending balance	290,831		287,935
Ending balance: individually evaluated for impairment	3,542		3,763
Ending balance: collectively evaluated for impairment	287,261		284,142
Real estate Residential | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	28		30
Consumer
Allowance for loan losses:
Ending balance	1,356	$ 1,374	1,380	$ 1,593	$ 1,571	$ 1,608
Ending balance: individually evaluated for impairment	3		8
Ending balance: collectively evaluated for impairment	1,353		1,372
Loans receivable:
Ending balance	125,891		142,721
Ending balance: individually evaluated for impairment	63		177
Ending balance: collectively evaluated for impairment	$ 125,828		$ 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)
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-Publisher FASB
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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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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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