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Loans, net and allowance for loan losses - Changes in Allowance for Loan Losses Account by Major Classification of Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017
Allowance for loan losses:
Beginning Balance	$ 18,960	$ 15,961
Charge-offs	(426)	(311)
Recoveries	134	119
Provisions	1,050	1,200
Ending balance	19,718	16,969
Beginning Balance	18,960	15,961
Ending balance: individually evaluated for impairment			$ 1,755	$ 766
Charge-offs	(426)	(311)
Ending balance: collectively evaluated for impairment			17,963	18,194
Recoveries	134	119
Ending balance: loans acquired with deteriorated credit quality	18,960	15,961	19,718	18,960
Provisions	1,050	1,200
Loans receivable:
Total Loans			1,725,781	1,693,065
Ending balance: individually evaluated for impairment			10,727	9,705
Ending balance: collectively evaluated for impairment			1,714,116	1,682,343
Total Loans			1,725,781	1,693,065
Ending balance	19,718	16,969
Ending balance: individually evaluated for impairment			10,727	9,705
Ending balance: collectively evaluated for impairment			1,714,116	1,682,343
Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance			938	1,017
Ending balance			938	1,017
Commercial
Allowance for loan losses:
Beginning Balance	5,052	3,799
Recoveries	57	7
Provisions	297	323
Ending balance	5,406	4,129
Beginning Balance	5,052	3,799
Ending balance: individually evaluated for impairment			145	159
Ending balance: collectively evaluated for impairment			5,261	4,893
Recoveries	57	7
Ending balance: loans acquired with deteriorated credit quality	5,052	3,799	5,406	5,052
Provisions	297	323
Loans receivable:
Total Loans			467,404	476,199
Ending balance: individually evaluated for impairment			2,023	2,121
Ending balance: collectively evaluated for impairment			465,060	473,736
Total Loans			467,404	476,199
Ending balance	5,406	4,129
Ending balance: individually evaluated for impairment			2,023	2,121
Ending balance: collectively evaluated for impairment			465,060	473,736
Commercial | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance			321	342
Ending balance			321	342
Real estate Commercial
Allowance for loan losses:
Beginning Balance	7,548	5,847
Charge-offs		(125)
Recoveries	27	33
Provisions	524	536
Ending balance	8,099	6,291
Beginning Balance	7,548	5,847
Ending balance: individually evaluated for impairment			1,411	263
Charge-offs		(125)
Ending balance: collectively evaluated for impairment			6,688	7,285
Recoveries	27	33
Ending balance: loans acquired with deteriorated credit quality	7,548	5,847	8,099	7,548
Provisions	524	536
Loans receivable:
Total Loans			833,497	786,210
Ending balance: individually evaluated for impairment			4,784	3,644
Ending balance: collectively evaluated for impairment			828,125	781,921
Total Loans			833,497	786,210
Ending balance	8,099	6,291
Ending balance: individually evaluated for impairment			4,784	3,644
Ending balance: collectively evaluated for impairment			828,125	781,921
Real estate Commercial | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance			588	645
Ending balance			588	645
Real estate Residential
Allowance for loan losses:
Beginning Balance	4,980	4,707
Charge-offs	(299)	(15)
Recoveries	10	22
Provisions	148	264
Ending balance	4,839	4,978
Beginning Balance	4,980	4,707
Charge-offs	(299)	(15)
Recoveries	10	22
Ending balance: loans acquired with deteriorated credit quality	4,980	4,707	4,839	4,980
Provisions	148	264
Loans receivable:
Total Loans			289,367	287,935
Total Loans			289,367	287,935
Ending balance	4,839	4,978
Consumer
Allowance for loan losses:
Beginning Balance	1,380	1,608
Charge-offs	(127)	(171)
Recoveries	40	57
Provisions	81	77
Ending balance	1,374	1,571
Beginning Balance	1,380	1,608
Ending balance: individually evaluated for impairment			17	8
Charge-offs	(127)	(171)
Ending balance: collectively evaluated for impairment			1,357	1,372
Recoveries	40	57
Ending balance: loans acquired with deteriorated credit quality	1,380	1,608	1,374	1,380
Provisions	81	77
Loans receivable:
Total Loans			135,513	142,721
Ending balance: individually evaluated for impairment			169	177
Ending balance: collectively evaluated for impairment			135,344	142,544
Total Loans			135,513	142,721
Ending balance	$ 1,374	$ 1,571
Ending balance: individually evaluated for impairment			169	177
Ending balance: collectively evaluated for impairment			$ 135,344	$ 142,544

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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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