Loans and Allowance for Credit Losses - Past due aging analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Past due aging analysis of loans
Loans	$ 2,533,522	$ 2,443,994
Nonaccrual	2,233	3,794
30 - 89 Days Past Due
Past due aging analysis of loans
Loans	10,988	4,963
90 Days or More Past Due
Past due aging analysis of loans
Loans	347
Current
Past due aging analysis of loans
Loans	2,519,954	2,435,237
Commercial
Past due aging analysis of loans
Loans	1,634,109	1,563,356
Nonaccrual	1,428	3,074
Commercial | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans	8,710	2,794
Commercial | Current
Past due aging analysis of loans
Loans	1,623,971	1,557,488
Commercial | Commercial and industrial
Past due aging analysis of loans
Loans	551,860	583,876
Nonaccrual	381	1,162
Commercial | Commercial and industrial | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans	8,710	2,426
Commercial | Commercial and industrial | Current
Past due aging analysis of loans
Loans	542,769	580,288
Commercial | Real estate construction
Past due aging analysis of loans
Loans	78,428	97,810
Nonaccrual	151	440
Commercial | Real estate construction | Current
Past due aging analysis of loans
Loans	78,277	97,370
Commercial | Commercial real estate
Past due aging analysis of loans
Loans	1,003,821	881,670
Nonaccrual	896	1,472
Commercial | Commercial real estate | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans		368
Commercial | Commercial real estate | Current
Past due aging analysis of loans
Loans	1,002,925	879,830
Consumer
Past due aging analysis of loans
Loans	899,413	880,638
Nonaccrual	805	720
Consumer | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans	2,278	2,169
Consumer | 90 Days or More Past Due
Past due aging analysis of loans
Loans	347
Consumer | Current
Past due aging analysis of loans
Loans	895,983	877,749
Consumer | Residential | Real estate first mortgage
Past due aging analysis of loans
Loans	707,630	679,551
Nonaccrual	299	535
Consumer | Residential | Real estate first mortgage | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans	2,027	1,545
Consumer | Residential | Real estate first mortgage | 90 Days or More Past Due
Past due aging analysis of loans
Loans	347
Consumer | Residential | Real estate first mortgage | Current
Past due aging analysis of loans
Loans	704,957	677,471
Consumer | Residential | Real estate junior lien
Past due aging analysis of loans
Loans	157,231	150,479
Nonaccrual	500	184
Consumer | Residential | Real estate junior lien | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans	105	377
Consumer | Residential | Real estate junior lien | Current
Past due aging analysis of loans
Loans	156,626	149,918
Consumer | Other revolving and installment
Past due aging analysis of loans
Loans	34,552	50,608
Nonaccrual	6	1
Consumer | Other revolving and installment | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans	146	247
Consumer | Other revolving and installment | Current
Past due aging analysis of loans
Loans	$ 34,400	$ 50,360