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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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Allowance for loan losses:
Ending balance	$ 22,105	$ 21,379	$ 19,718	$ 18,960
Ending balance: individually evaluated for impairment	988	1,179
Ending balance: collectively evaluated for impairment	21,117	20,200
Loans receivable:
Ending balance	1,849,602	1,823,266
Ending balance: individually evaluated for impairment	13,680	9,641
Ending balance: collectively evaluated for impairment	1,835,922	1,813,625
Commercial
Allowance for loan losses:
Ending balance	5,955	5,516	5,406	5,052
Ending balance: individually evaluated for impairment	138	50
Ending balance: collectively evaluated for impairment	5,817	5,466
Loans receivable:
Ending balance	516,756	494,134
Ending balance: individually evaluated for impairment	7,012	2,237
Ending balance: collectively evaluated for impairment	509,744	491,897
Real estate Commercial
Allowance for loan losses:
Ending balance	11,074	10,736	8,099	7,548
Ending balance: individually evaluated for impairment	389	403
Ending balance: collectively evaluated for impairment	10,685	10,333
Loans receivable:
Ending balance	917,035	907,803
Ending balance: individually evaluated for impairment	3,535	3,121
Ending balance: collectively evaluated for impairment	913,500	904,682
Real estate Residential
Allowance for loan losses:
Ending balance	3,880	3,892	4,839	4,980
Ending balance: individually evaluated for impairment	461	666
Ending balance: collectively evaluated for impairment	3,419	3,226
Loans receivable:
Ending balance	299,330	299,876
Ending balance: individually evaluated for impairment	2,895	4,071
Ending balance: collectively evaluated for impairment	296,435	295,805
Consumer
Allowance for loan losses:
Ending balance	1,196	1,235	$ 1,374	$ 1,380
Ending balance: individually evaluated for impairment		60
Ending balance: collectively evaluated for impairment	1,196	1,175
Loans receivable:
Ending balance	116,481	121,453
Ending balance: individually evaluated for impairment	238	212
Ending balance: collectively evaluated for impairment	$ 116,243	$ 121,241

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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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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