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Loans, net and allowance for loan losses - Major Classification of Loans by Past Due Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due
Current	$ 5,154	$ 9,121
Total Loans	2,329,173	2,177,982	$ 1,938,240
Loans > 90 Days and Accruing	$ 13	71
Minimum
Financing Receivable, Recorded Investment, Past Due
Number of days in which principal only payments and principal and interest deferrals are generally granted	90 days
Maximum
Financing Receivable, Recorded Investment, Past Due
Number of days in which principal only payments and principal and interest deferrals are generally granted	180 days
Current
Financing Receivable, Recorded Investment, Past Due
Current	$ 2,324,019	2,168,861
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Current	2,898	2,943
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Current	948	772
Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due
Current	1,308	5,406
Commercial
Financing Receivable, Recorded Investment, Past Due
Current	414	2,318
Total Loans	613,127	679,286	522,957
Commercial | Current
Financing Receivable, Recorded Investment, Past Due
Current	612,713	676,968
Commercial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Current	101	73
Commercial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Current	155
Commercial | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due
Current	158	2,245
Real estate Commercial
Financing Receivable, Recorded Investment, Past Due
Current	2,025	2,998
Total Loans	1,343,539	1,137,990	1,011,423
Real estate Commercial | Current
Financing Receivable, Recorded Investment, Past Due
Current	1,341,514	1,134,992
Real estate Commercial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Current	768	414
Real estate Commercial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Current	423	222
Real estate Commercial | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due
Current	834	2,362
Real estate Residential
Financing Receivable, Recorded Investment, Past Due
Current	2,024	3,284
Total Loans	297,624	277,414	301,378
Loans > 90 Days and Accruing	13	71
Real estate Residential | Current
Financing Receivable, Recorded Investment, Past Due
Current	295,600	274,130
Real estate Residential | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Current	1,552	2,072
Real estate Residential | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Current	207	480
Real estate Residential | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due
Current	265	732
Consumer
Financing Receivable, Recorded Investment, Past Due
Current	691	521
Total Loans	74,883	83,292	$ 102,482
Consumer | Current
Financing Receivable, Recorded Investment, Past Due
Current	74,192	82,771
Consumer | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Current	477	384
Consumer | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Current	163	70
Consumer | Greater than 90 Days
Financing Receivable, Recorded Investment, Past Due
Current	51	$ 67
PPP
Financing Receivable, Recorded Investment, Past Due
Total Loans	$ 68,893

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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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Amount, before allowance for credit loss, of financing receivable.

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