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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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Allowance for loan losses:
Beginning Balance	$ 17,802	$ 14,799	$ 15,961	$ 12,975
Charge-offs	(268)	(355)	(1,010)	(1,110)
Recoveries	97	68	280	247
Provisions	1,200	1,200	3,600	3,600
Ending balance	18,831	15,712	18,831	15,712
Beginning Balance	17,802	14,799	15,961	12,975
Ending balance: individually evaluated for impairment					$ 1,706	$ 1,942
Charge-offs	(268)	(355)	(1,010)	(1,110)
Ending balance: collectively evaluated for impairment					17,125	14,019
Recoveries	97	68	280	247
Ending balance: loans acquired with deteriorated credit quality	17,802	14,799	15,961	12,975	18,831	15,961
Provisions	1,200	1,200	3,600	3,600
Loans receivable:
Total Loans					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
Total Loans					1,632,515	1,532,965
Ending balance	18,831	15,712	18,831	15,712
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
Ending balance					1,030	2,337
Commercial
Allowance for loan losses:
Beginning Balance	4,426	3,263	3,799	3,042
Charge-offs	(17)		(49)	(396)
Recoveries	3	2	16	38
Provisions	358	321	1,004	902
Ending balance	4,770	3,586	4,770	3,586
Beginning Balance	4,426	3,263	3,799	3,042
Ending balance: individually evaluated for impairment					436	225
Charge-offs	(17)		(49)	(396)
Ending balance: collectively evaluated for impairment					4,334	3,574
Recoveries	3	2	16	38
Ending balance: loans acquired with deteriorated credit quality	4,426	3,263	3,799	3,042	4,770	3,799
Provisions	358	321	1,004	902
Loans receivable:
Total Loans					449,464	408,814
Ending balance: individually evaluated for impairment					2,789	1,724
Ending balance: collectively evaluated for impairment					446,322	406,127
Total Loans					449,464	408,814
Ending balance	4,770	3,586	4,770	3,586
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
Ending balance					353	963
Real estate Commercial
Allowance for loan losses:
Beginning Balance	6,587	5,077	5,847	4,245
Charge-offs		(72)	(367)	(175)
Recoveries	41	28	96	58
Provisions	566	548	1,618	1,453
Ending balance	7,194	5,581	7,194	5,581
Beginning Balance	6,587	5,077	5,847	4,245
Ending balance: individually evaluated for impairment					631	1,197
Charge-offs		(72)	(367)	(175)
Ending balance: collectively evaluated for impairment					6,563	4,650
Recoveries	41	28	96	58
Ending balance: loans acquired with deteriorated credit quality	6,587	5,077	5,847	4,245	7,194	5,847
Provisions	566	548	1,618	1,453
Loans receivable:
Total Loans					751,510	700,144
Ending balance: individually evaluated for impairment					4,062	5,820
Ending balance: collectively evaluated for impairment					746,802	692,987
Total Loans					751,510	700,144
Ending balance	7,194	5,581	7,194	5,581
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
Ending balance					646	1,337
Real estate Residential
Allowance for loan losses:
Beginning Balance	5,196	4,465	4,707	4,082
Charge-offs	(82)	(153)	(105)	(279)
Recoveries	4	4	30	39
Provisions	175	245	661	719
Ending balance	5,293	4,561	5,293	4,561
Beginning Balance	5,196	4,465	4,707	4,082
Ending balance: individually evaluated for impairment					616	520
Charge-offs	(82)	(153)	(105)	(279)
Ending balance: collectively evaluated for impairment					4,677	4,187
Recoveries	4	4	30	39
Ending balance: loans acquired with deteriorated credit quality	5,196	4,465	4,707	4,082	5,293	4,707
Provisions	175	245	661	719
Loans receivable:
Total Loans					289,582	289,781
Ending balance: individually evaluated for impairment					3,697	3,543
Ending balance: collectively evaluated for impairment					285,854	286,201
Total Loans					289,582	289,781
Ending balance	5,293	4,561	5,293	4,561
Ending balance: individually evaluated for impairment					3,697	3,543
Ending balance: collectively evaluated for impairment					285,854	286,201
Real estate Residential | Loans Acquired with Deteriorated Credit Quality
Loans receivable:
Ending balance					31	37
Ending balance					31	37
Consumer
Allowance for loan losses:
Beginning Balance	1,593	1,679	1,608	1,583
Charge-offs	(169)	(130)	(489)	(260)
Recoveries	49	34	138	112
Provisions	101	86	317	234
Ending balance	1,574	1,669	1,574	1,669
Beginning Balance	1,593	1,679	1,608	1,583
Ending balance: individually evaluated for impairment					23
Charge-offs	(169)	(130)	(489)	(260)
Ending balance: collectively evaluated for impairment					1,551	1,608
Recoveries	49	34	138	112
Ending balance: loans acquired with deteriorated credit quality	1,593	1,679	1,608	1,583	1,574	1,608
Provisions	101	86	317	234
Loans receivable:
Total Loans					141,959	134,226
Ending balance: individually evaluated for impairment					194	155
Ending balance: collectively evaluated for impairment					141,765	134,071
Total Loans					141,959	134,226
Ending balance	$ 1,574	1,669	$ 1,574	1,669
Ending balance: individually evaluated for impairment					194	155
Ending balance: collectively evaluated for impairment					$ 141,765	$ 134,071
Unallocated
Allowance for loan losses:
Beginning Balance		315		23
Provisions				292
Ending balance		315		315
Beginning Balance		315		23
Ending balance: loans acquired with deteriorated credit quality		315		23
Provisions				292
Loans receivable:
Ending balance		$ 315		$ 315

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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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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