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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								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for loan losses:
Beginning Balance				$ 18,960				$ 15,961	$ 18,960	$ 15,961	$ 12,975
Charge-offs									(2,354)	(2,149)	(2,468)
Recoveries									573	348	454
Provisions	$ 1,050	$ 1,050	$ 1,050	1,050	$ 1,200	$ 1,200	$ 1,200	1,200	4,200	4,800	5,000
Ending balance	21,379				18,960				21,379	18,960	15,961
Beginning Balance				18,960				15,961	18,960	15,961	12,975
Ending balance: individually evaluated for impairment												$ 1,179	$ 766	$ 1,942
Charge-offs									(2,354)	(2,149)	(2,468)
Ending balance: collectively evaluated for impairment												20,200	18,194	14,019
Recoveries									573	348	454
Ending balance: loans acquired with deteriorated credit quality	21,379			18,960	18,960			15,961	18,960	15,961	12,975	21,379	18,960	15,961
Provisions	1,050	$ 1,050	$ 1,050	1,050	1,200	$ 1,200	$ 1,200	1,200	4,200	4,800	5,000
Loans receivable:
Total Loans												1,823,266	1,693,065	1,532,965
Ending balance: individually evaluated for impairment												9,641	10,722	13,579
Ending balance: collectively evaluated for impairment												1,813,625	1,682,343	1,519,386
Total Loans												1,823,266	1,693,065	1,532,965
Ending balance	21,379				18,960				21,379	18,960	15,961
Ending balance: individually evaluated for impairment												9,641	10,722	13,579
Ending balance: collectively evaluated for impairment												1,813,625	1,682,343	1,519,386
Commercial
Allowance for loan losses:
Beginning Balance				5,513				4,452	5,513	4,452	4,113
Charge-offs									(154)	(173)	(776)
Recoveries									137	20	86
Provisions									20	1,214	1,029
Ending balance	5,516				5,513				5,516	5,513	4,452
Beginning Balance				5,513				4,452	5,513	4,452	4,113
Ending balance: individually evaluated for impairment												50	159	225
Charge-offs									(154)	(173)	(776)
Ending balance: collectively evaluated for impairment												5,466	5,354	4,227
Recoveries									137	20	86
Ending balance: loans acquired with deteriorated credit quality	5,516			5,513	5,513			4,452	5,513	4,452	4,113	5,516	5,513	4,452
Provisions									20	1,214	1,029
Loans receivable:
Total Loans												494,134	476,199	408,814
Ending balance: individually evaluated for impairment												2,237	2,463	2,687
Ending balance: collectively evaluated for impairment												491,897	473,736	406,127
Total Loans												494,134	476,199	408,814
Ending balance	5,516				5,513				5,516	5,513	4,452
Ending balance: individually evaluated for impairment												2,237	2,463	2,687
Ending balance: collectively evaluated for impairment												491,897	473,736	406,127
Real estate Commercial
Allowance for loan losses:
Beginning Balance				8,944				7,548	8,944	7,548	4,751
Charge-offs									(1,250)	(706)	(858)
Recoveries									136	124	122
Provisions									2,906	1,978	3,533
Ending balance	10,736				8,944				10,736	8,944	7,548
Beginning Balance				8,944				7,548	8,944	7,548	4,751
Ending balance: individually evaluated for impairment												403	263	1,197
Charge-offs									(1,250)	(706)	(858)
Ending balance: collectively evaluated for impairment												10,333	8,681	6,351
Recoveries									136	124	122
Ending balance: loans acquired with deteriorated credit quality	10,736			8,944	8,944			7,548	8,944	7,548	4,751	10,736	8,944	7,548
Provisions									2,906	1,978	3,533
Loans receivable:
Total Loans												907,803	786,210	700,144
Ending balance: individually evaluated for impairment												3,121	4,289	7,157
Ending balance: collectively evaluated for impairment												904,682	781,921	692,987
Total Loans												907,803	786,210	700,144
Ending balance	10,736				8,944				10,736	8,944	7,548
Ending balance: individually evaluated for impairment												3,121	4,289	7,157
Ending balance: collectively evaluated for impairment												904,682	781,921	692,987
Real estate Residential
Allowance for loan losses:
Beginning Balance				3,111				2,961	3,111	2,961	3,174
Charge-offs									(405)	(533)	(339)
Recoveries									98	44	69
Provisions									1,088	639	57
Ending balance	3,892				3,111				3,892	3,111	2,961
Beginning Balance				3,111				2,961	3,111	2,961	3,174
Ending balance: individually evaluated for impairment												666	336	520
Charge-offs									(405)	(533)	(339)
Ending balance: collectively evaluated for impairment												3,226	2,775	2,441
Recoveries									98	44	69
Ending balance: loans acquired with deteriorated credit quality	3,892			3,111	3,111			2,961	3,111	2,961	3,174	3,892	3,111	2,961
Provisions									1,088	639	57
Loans receivable:
Total Loans												299,876	287,935	289,781
Ending balance: individually evaluated for impairment												4,071	3,793	3,580
Ending balance: collectively evaluated for impairment												295,805	284,142	286,201
Total Loans												299,876	287,935	289,781
Ending balance	3,892				3,111				3,892	3,111	2,961
Ending balance: individually evaluated for impairment												4,071	3,793	3,580
Ending balance: collectively evaluated for impairment												295,805	284,142	286,201
Consumer
Allowance for loan losses:
Beginning Balance				1,392				1,000	1,392	1,000	937
Charge-offs									(545)	(737)	(495)
Recoveries									202	160	177
Provisions									186	969	381
Ending balance	1,235				1,392				1,235	1,392	1,000
Beginning Balance				1,392				1,000	1,392	1,000	937
Ending balance: individually evaluated for impairment												60	8
Charge-offs									(545)	(737)	(495)
Ending balance: collectively evaluated for impairment												1,175	1,384	1,000
Recoveries									202	160	177
Ending balance: loans acquired with deteriorated credit quality	1,235			$ 1,392	1,392			$ 1,000	1,392	1,000	937	1,235	1,392	1,000
Provisions									186	969	381
Loans receivable:
Total Loans												121,453	142,721	134,226
Ending balance: individually evaluated for impairment												212	177	155
Ending balance: collectively evaluated for impairment												121,241	142,544	134,071
Total Loans												121,453	142,721	134,226
Ending balance	$ 1,235				$ 1,392				$ 1,235	$ 1,392	$ 1,000
Ending balance: individually evaluated for impairment												212	177	155
Ending balance: collectively evaluated for impairment												$ 121,241	$ 142,544	$ 134,071

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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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