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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017
Allowance for loan losses:
Beginning Balance	$ 19,573	$ 17,802	$ 18,960	$ 15,961
Charge-offs	(328)	(268)	(2,152)	(1,010)
Recoveries	118	97	455	280
Provisions	1,050	1,200	3,150	3,600
Ending balance	20,413	18,831	20,413	18,831
Beginning Balance	19,573	17,802	18,960	15,961
Ending balance: individually evaluated for impairment					$ 931	$ 766
Charge-offs	(328)	(268)	(2,152)	(1,010)
Ending balance: collectively evaluated for impairment					19,482	18,194
Recoveries	118	97	455	280
Ending balance: loans acquired with deteriorated credit quality	19,573	17,802	18,960	15,961	20,413	18,960
Provisions	1,050	1,200	3,150	3,600
Loans receivable:
Total Loans					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
Total Loans					1,779,445	1,693,065
Ending balance	20,413	18,831	20,413	18,831
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
Ending balance					871	1,017
Commercial
Allowance for loan losses:
Beginning Balance	5,749	4,426	5,052	3,799
Charge-offs	(148)	(17)	(150)	(49)
Recoveries	12	3	128	16
Provisions	289	358	872	1,004
Ending balance	5,902	4,770	5,902	4,770
Beginning Balance	5,749	4,426	5,052	3,799
Ending balance: individually evaluated for impairment					93	159
Charge-offs	(148)	(17)	(150)	(49)
Ending balance: collectively evaluated for impairment					5,809	4,893
Recoveries	12	3	128	16
Ending balance: loans acquired with deteriorated credit quality	5,749	4,426	5,052	3,799	5,902	5,052
Provisions	289	358	872	1,004
Loans receivable:
Total Loans					478,128	476,199
Ending balance: individually evaluated for impairment					1,996	2,121
Ending balance: collectively evaluated for impairment					475,833	473,736
Total Loans					478,128	476,199
Ending balance	5,902	4,770	5,902	4,770
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
Ending balance					299	342
Real estate Commercial
Allowance for loan losses:
Beginning Balance	7,506	6,587	7,548	5,847
Charge-offs	(63)		(1,232)	(367)
Recoveries	26	41	83	96
Provisions	536	566	1,606	1,618
Ending balance	8,005	7,194	8,005	7,194
Beginning Balance	7,506	6,587	7,548	5,847
Ending balance: individually evaluated for impairment					462	263
Charge-offs	(63)		(1,232)	(367)
Ending balance: collectively evaluated for impairment					7,543	7,285
Recoveries	26	41	83	96
Ending balance: loans acquired with deteriorated credit quality	7,506	6,587	7,548	5,847	8,005	7,548
Provisions	536	566	1,606	1,618
Loans receivable:
Total Loans					881,071	786,210
Ending balance: individually evaluated for impairment					4,538	3,644
Ending balance: collectively evaluated for impairment					875,988	781,921
Total Loans					881,071	786,210
Ending balance	8,005	7,194	8,005	7,194
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
Ending balance					545	645
Real estate Residential
Allowance for loan losses:
Beginning Balance	4,962	5,196	4,980	4,707
Charge-offs		(82)	(381)	(105)
Recoveries	13	4	80	30
Provisions	164	175	460	661
Ending balance	5,139	5,293	5,139	5,293
Beginning Balance	4,962	5,196	4,980	4,707
Ending balance: individually evaluated for impairment					362	336
Charge-offs		(82)	(381)	(105)
Ending balance: collectively evaluated for impairment					4,777	4,644
Recoveries	13	4	80	30
Ending balance: loans acquired with deteriorated credit quality	4,962	5,196	4,980	4,707	5,139	4,980
Provisions	164	175	460	661
Loans receivable:
Total Loans					297,819	287,935
Ending balance: individually evaluated for impairment					3,651	3,763
Ending balance: collectively evaluated for impairment					294,141	284,142
Total Loans					297,819	287,935
Ending balance	5,139	5,293	5,139	5,293
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
Ending balance					27	30
Real estate Residential
Loans receivable:
Total Loans					297,819	287,935
Total Loans					297,819	287,935
Consumer
Allowance for loan losses:
Beginning Balance	1,356	1,593	1,380	1,608
Charge-offs	(117)	(169)	(389)	(489)
Recoveries	67	49	164	138
Provisions	61	101	212	317
Ending balance	1,367	1,574	1,367	1,574
Beginning Balance	1,356	1,593	1,380	1,608
Ending balance: individually evaluated for impairment					14	8
Charge-offs	(117)	(169)	(389)	(489)
Ending balance: collectively evaluated for impairment					1,353	1,372
Recoveries	67	49	164	138
Ending balance: loans acquired with deteriorated credit quality	1,356	1,593	1,380	1,608	1,367	1,380
Provisions	61	101	212	317
Loans receivable:
Total Loans					122,427	142,721
Ending balance: individually evaluated for impairment					156	177
Ending balance: collectively evaluated for impairment					122,271	142,544
Total Loans					122,427	142,721
Ending balance	$ 1,367	$ 1,574	$ 1,367	$ 1,574
Ending balance: individually evaluated for impairment					156	177
Ending balance: collectively evaluated for impairment					$ 122,271	$ 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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