Loans and Allowance for Credit Losses - Past due aging analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Past due aging analysis of loans
Loans	$ 2,759,583	$ 2,443,994
Nonaccrual	8,596	3,794
30-59 Days Past Due
Past due aging analysis of loans
Loans	2,789
60-89 Days Past Due
Past due aging analysis of loans
Loans	601	415
30 - 89 Days Past Due
Past due aging analysis of loans
Loans		4,548
90 Days or More Past Due
Past due aging analysis of loans
Loans	139
Current
Past due aging analysis of loans
Loans	2,747,458	2,435,237
Commercial
Past due aging analysis of loans
Loans	1,849,267	1,563,356
Nonaccrual	7,710	3,074
Commercial | 30-59 Days Past Due
Past due aging analysis of loans
Loans	1,052
Commercial | 60-89 Days Past Due
Past due aging analysis of loans
Loans		94
Commercial | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans		2,700
Commercial | 90 Days or More Past Due
Past due aging analysis of loans
Loans	139
Commercial | Current
Past due aging analysis of loans
Loans	1,840,366	1,557,488
Commercial | Commercial and industrial
Past due aging analysis of loans
Loans	598,321	583,876
Nonaccrual	6,595	1,162
Commercial | Commercial and industrial | 30-59 Days Past Due
Past due aging analysis of loans
Loans	924
Commercial | Commercial and industrial | 60-89 Days Past Due
Past due aging analysis of loans
Loans		94
Commercial | Commercial and industrial | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans		2,332
Commercial | Commercial and industrial | 90 Days or More Past Due
Past due aging analysis of loans
Loans	139
Commercial | Commercial and industrial | Current
Past due aging analysis of loans
Loans	590,663	580,288
Commercial | Real estate construction
Past due aging analysis of loans
Loans	124,034	97,810
Nonaccrual		440
Commercial | Real estate construction | Current
Past due aging analysis of loans
Loans	124,034	97,370
Commercial | Commercial real estate
Past due aging analysis of loans
Loans	1,126,912	881,670
Nonaccrual	1,115	1,472
Commercial | Commercial real estate | 30-59 Days Past Due
Past due aging analysis of loans
Loans	128
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	1,125,669	879,830
Consumer
Past due aging analysis of loans
Loans	910,316	880,638
Nonaccrual	886	720
Consumer | 30-59 Days Past Due
Past due aging analysis of loans
Loans	1,737
Consumer | 60-89 Days Past Due
Past due aging analysis of loans
Loans	601	321
Consumer | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans		1,848
Consumer | Current
Past due aging analysis of loans
Loans	907,092	877,749
Consumer | Residential | Real estate first mortgage
Past due aging analysis of loans
Loans	726,879	679,551
Nonaccrual	638	535
Consumer | Residential | Real estate first mortgage | Performing
Past due aging analysis of loans
Loans	726,774
Consumer | Residential | Real estate first mortgage | Nonperforming
Past due aging analysis of loans
Loans	105
Consumer | Residential | Real estate first mortgage | 30-59 Days Past Due
Past due aging analysis of loans
Loans	901
Consumer | Residential | Real estate first mortgage | 60-89 Days Past Due
Past due aging analysis of loans
Loans	554	311
Consumer | Residential | Real estate first mortgage | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans		1,234
Consumer | Residential | Real estate first mortgage | Current
Past due aging analysis of loans
Loans	724,786	677,471
Consumer | Residential | Real estate junior lien
Past due aging analysis of loans
Loans	154,134	150,479
Nonaccrual	248	184
Consumer | Residential | Real estate junior lien | Performing
Past due aging analysis of loans
Loans	152,353
Consumer | Residential | Real estate junior lien | Nonperforming
Past due aging analysis of loans
Loans	1,781
Consumer | Residential | Real estate junior lien | 30-59 Days Past Due
Past due aging analysis of loans
Loans	666
Consumer | Residential | Real estate junior lien | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans		377
Consumer | Residential | Real estate junior lien | Current
Past due aging analysis of loans
Loans	153,220	149,918
Consumer | Other revolving and installment
Past due aging analysis of loans
Loans	29,303	50,608
Nonaccrual		1
Consumer | Other revolving and installment | Performing
Past due aging analysis of loans
Loans	29,303
Consumer | Other revolving and installment | 30-59 Days Past Due
Past due aging analysis of loans
Loans	170
Consumer | Other revolving and installment | 60-89 Days Past Due
Past due aging analysis of loans
Loans	47	10
Consumer | Other revolving and installment | 30 - 89 Days Past Due
Past due aging analysis of loans
Loans		237
Consumer | Other revolving and installment | Current
Past due aging analysis of loans
Loans	$ 29,086	$ 50,360