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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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for loan losses:
Beginning Balance	$ 27,344	$ 22,677	$ 21,379
Charge-offs	(956)	(3,479)	(5,067)
Recoveries	245	746	265
Provisions (credits)	1,750	7,400	6,100
Ending balance	28,383	27,344	22,677
Allowance for credit losses increase (decrease)	1,100
Increase (decrease) in charge offs due to a partial write down of a non-accrual commercial relationship	1,500
Write-offs net of recoveries	700
Commercial
Allowance for loan losses:
Beginning Balance	8,734	6,888	5,516
Charge-offs	(492)	(2,771)	(3,314)
Recoveries	89	525	69
Provisions (credits)	122	4,092	4,617
Ending balance	8,453	8,734	6,888
Commercial | Small Business Line of Credit
Allowance for loan losses:
Charge-offs	(400)	(900)
Recoveries		200
Real estate Commercial
Allowance for loan losses:
Beginning Balance	14,559	11,496	10,736
Charge-offs	(252)	(144)	(817)
Recoveries	68	16	1
Provisions (credits)	1,553	3,191	1,576
Ending balance	15,928	14,559	11,496
Real estate Residential
Allowance for loan losses:
Beginning Balance	3,129	3,226	3,892
Charge-offs	(24)	(247)	(477)
Recoveries	7	57	29
Provisions (credits)	97	93	(218)
Ending balance	3,209	3,129	3,226
Consumer
Allowance for loan losses:
Beginning Balance	922	1,067	1,235
Charge-offs	(188)	(317)	(459)
Recoveries	81	148	166
Provisions (credits)	(22)	24	125
Ending balance	$ 793	$ 922	$ 1,067

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