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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, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Allowance for loan losses:
Ending balance	$ 20,413	$ 19,573	$ 18,960	$ 18,831	$ 17,802	$ 15,961
Ending balance: individually evaluated for impairment	931		766
Ending balance: collectively evaluated for impairment	19,482		18,194
Loans receivable:
Ending balance	1,779,445		1,693,065
Ending balance: individually evaluated for impairment	10,341		9,705
Ending balance: collectively evaluated for impairment	1,768,233		1,682,343
Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	871		1,017
Commercial
Allowance for loan losses:
Ending balance	5,902	5,749	5,052	4,770	4,426	3,799
Ending balance: individually evaluated for impairment	93		159
Ending balance: collectively evaluated for impairment	5,809		4,893
Loans receivable:
Ending balance	478,128		476,199
Ending balance: individually evaluated for impairment	1,996		2,121
Ending balance: collectively evaluated for impairment	475,833		473,736
Commercial | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	299		342
Real estate Commercial
Allowance for loan losses:
Ending balance	8,005	7,506	7,548	7,194	6,587	5,847
Ending balance: individually evaluated for impairment	462		263
Ending balance: collectively evaluated for impairment	7,543		7,285
Loans receivable:
Ending balance	881,071		786,210
Ending balance: individually evaluated for impairment	4,538		3,644
Ending balance: collectively evaluated for impairment	875,988		781,921
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	545		645
Real estate Residential
Allowance for loan losses:
Ending balance	5,139	4,962	4,980	5,293	5,196	4,707
Ending balance: individually evaluated for impairment	362		336
Ending balance: collectively evaluated for impairment	4,777		4,644
Loans receivable:
Ending balance	297,819		287,935
Ending balance: individually evaluated for impairment	3,651		3,763
Ending balance: collectively evaluated for impairment	294,141		284,142
Real estate Residential | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance	27		30
Consumer
Allowance for loan losses:
Ending balance	1,367	$ 1,356	1,380	$ 1,574	$ 1,593	$ 1,608
Ending balance: individually evaluated for impairment	14		8
Ending balance: collectively evaluated for impairment	1,353		1,372
Loans receivable:
Ending balance	122,427		142,721
Ending balance: individually evaluated for impairment	156		177
Ending balance: collectively evaluated for impairment	$ 122,271		$ 142,544

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

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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.

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