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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
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Allowance for loan losses:
Beginning Balance	$ 27,344	$ 22,677	$ 22,677
Charge-offs	(195)	(798)
Recoveries	134	307
Provisions (credits)	(500)	3,500
Ending balance	26,783	25,686	$ 27,344
Allowance for credit losses increase (decrease)	$ 600
Allowance for credit losses increase (decrease) percentage	2.10%
Increase (decrease) in allowance for credit loss on financing receivable from improved credit quality	$ 500
Percentage of allowance for loan losses	1.23%		1.26%
Percentage of PPP loans to total loans	1.35%
Allowance for Loan and Lease Losses Write-offs, Net	$ 100	$ 500
Percentage of allowance for loan losses, charge offs net of recoveries to average loans	0.01%	0.10%
Commercial
Allowance for loan losses:
Beginning Balance	$ 8,734	$ 6,888	$ 6,888
Charge-offs	(15)	(650)
Recoveries	61	267
Provisions (credits)	(565)	1,464
Ending balance	8,215	7,969	8,734
Allowance for Loan and Lease Losses Write-offs, Net	600
Real estate Commercial
Allowance for loan losses:
Beginning Balance	14,559	11,496	11,496
Charge-offs	(96)
Recoveries	58
Provisions (credits)	182	1,511
Ending balance	14,703	13,007	14,559
Real estate Residential
Allowance for loan losses:
Beginning Balance	3,129	3,226	3,226
Charge-offs	(22)	(54)
Recoveries	1	10
Provisions (credits)	(114)	442
Ending balance	2,994	3,624	3,129
Consumer
Allowance for loan losses:
Beginning Balance	922	1,067	1,067
Charge-offs	(62)	(94)
Recoveries	14	30
Provisions (credits)	(3)	83
Ending balance	$ 871	$ 1,086	$ 922

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Amount of increase (decrease) in allowance for credit loss on financing receivable from improved credit quality and decrease in loan balances.

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