Loans, net and allowance for loan losses - Major Classification of Loans by Past Due Status (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due.
Loans	$ 2,565,579	$ 2,329,173
Loans > 90 Days and Accruing	190	13
Financial Assets, Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	4,678	5,154
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	2,432	2,898
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	913	948
Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due.
Total Due	1,333	1,308
Financial Assets, Not Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	2,560,901	2,324,019
Commercial
Financing Receivable, Recorded Investment, Past Due.
Loans	596,809	613,127
Commercial | Financial Assets, Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	224	414
Commercial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	78	101
Commercial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	19	155
Commercial | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due.
Total Due	127	158
Commercial | Financial Assets, Not Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	596,585	612,713
Real estate Commercial
Financing Receivable, Recorded Investment, Past Due.
Loans	1,569,658	1,343,539
Real estate Commercial | Financial Assets, Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	2,509	2,025
Real estate Commercial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	1,561	768
Real estate Commercial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	240	423
Real estate Commercial | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due.
Total Due	708	834
Real estate Commercial | Financial Assets, Not Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	1,567,149	1,341,514
Real estate Residential
Financing Receivable, Recorded Investment, Past Due.
Loans	317,672	297,624
Loans > 90 Days and Accruing	190	13
Real estate Residential | Financial Assets, Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	1,120	2,024
Real estate Residential | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	270	1,552
Real estate Residential | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	475	207
Real estate Residential | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due.
Total Due	375	265
Real estate Residential | Financial Assets, Not Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	316,552	295,600
Consumer
Financing Receivable, Recorded Investment, Past Due.
Loans	81,440	74,883
Consumer | Financial Assets, Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	825	691
Consumer | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	523	477
Consumer | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	179	163
Consumer | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due.
Total Due	123	51
Consumer | Financial Assets, Not Past Due
Financing Receivable, Recorded Investment, Past Due.
Total Due	$ 80,615	$ 74,192