Loans - Risk by loan portfolio (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Total Loans	$ 2,130,919
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Total loans	233
SBA loans held for investment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	58
2022	8,547
2021	7,257
2020	6,991
2019	2,970
2018 and Earlier	13,547
Total Loans	39,370
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2019	113
Total loans	113
SBA PPP loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2021	2,545
Total Loans	2,545
Commercial loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	30,004
2022	343,541
2021	191,183
2020	141,564
2019	107,032
2018 and Earlier	313,538
Revolving Loans Amortized Cost Basis	78,780
Total Loans	1,205,642
Residential mortgage loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	40,533
2022	274,919
2021	81,261
2020	57,510
2019	36,008
2018 and Earlier	128,909
Total Loans	619,140
Consumer loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	3,089
2022	5,725
2021	6,188
2020	749
2019	3,607
2018 and Earlier	8,682
Revolving Loans Amortized Cost Basis	48,744
Total Loans	76,784
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2022	22
2021	98
Total loans	120
Residential construction loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	4,670
2022	87,778
2021	50,880
2020	12,672
2019	3,676
2018 and Earlier	3,013
Revolving Loans Amortized Cost Basis	1,435
Total Loans	164,124
Total
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	78,354
2022	720,510
2021	339,314
2020	219,486
2019	153,293
2018 and Earlier	467,689
Revolving Loans Amortized Cost Basis	128,959
Total Loans	2,107,605
Performing | Residential mortgage loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	40,533
2022	274,612
2021	80,711
2020	56,606
2019	34,653
2018 and Earlier	126,460
Total Loans	613,575
Performing | Consumer loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	3,089
2022	5,725
2021	6,188
2020	749
2019	3,607
2018 and Earlier	8,682
Revolving Loans Amortized Cost Basis	48,744
Total Loans	76,784
Performing | Residential construction loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	4,670
2022	87,778
2021	50,623
2020	12,672
2019	3,676
2018 and Earlier	1,232
Total Loans	160,651
Nonperforming | Residential mortgage loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2022	307
2021	550
2020	904
2019	1,355
2018 and Earlier	2,449
Total Loans	5,565
Nonperforming | Residential construction loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2021	257
2018 and Earlier	1,781
Revolving Loans Amortized Cost Basis	1,435
Total Loans	3,473
Pass | SBA loans held for investment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	58
2022	7,186
2021	5,017
2020	6,289
2019	2,970
2018 and Earlier	12,006
Total Loans	33,526
Pass | SBA PPP loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2021	2,545
Total Loans	2,545
Pass | Commercial loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	30,004
2022	343,451
2021	189,080
2020	141,544
2019	104,763
2018 and Earlier	298,849
Revolving Loans Amortized Cost Basis	78,084
Total Loans	1,185,775
Special mention | SBA loans held for investment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2020	702
2018 and Earlier	745
Total Loans	1,447
Special mention | Commercial loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2022	90
2021	2,103
2019	2,269
2018 and Earlier	12,041
Revolving Loans Amortized Cost Basis	396
Total Loans	16,899
Substandard | SBA loans held for investment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2022	1,361
2021	2,240
2018 and Earlier	796
Total Loans	4,397
Substandard | Commercial loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2020	20
2018 and Earlier	2,648
Revolving Loans Amortized Cost Basis	300
Total Loans	$ 2,968