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Loans and Allowance for Loan Losses - Past due aging analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Past due aging analysis of loans
Accruing Current	$ 1,928,658	$ 1,969,285
Nonaccrual	4,756	5,050
Loans and Leases Receivable, Gross, Total	1,937,345	1,979,375
30 - 89 Days Past Due
Past due aging analysis of loans
Past due	3,931	5,010
90 Days or More Past Due
Past due aging analysis of loans
Past due		30
Commercial
Past due aging analysis of loans
Accruing Current	1,281,187	1,291,918
Nonaccrual	4,089	4,419
Loans and Leases Receivable, Gross, Total	1,287,953	1,299,316
Commercial | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	2,677	2,949
Commercial | 90 Days or More Past Due
Past due aging analysis of loans
Past due		30
Commercial | Commercial and industrial
Past due aging analysis of loans
Accruing Current	675,755	689,340
Nonaccrual	2,199	1,988
Loans and Leases Receivable, Gross, Total	678,029	691,858
Commercial | Commercial and industrial | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	75	500
Commercial | Commercial and industrial | 90 Days or More Past Due
Past due aging analysis of loans
Past due		30
Commercial | Real estate construction
Past due aging analysis of loans
Accruing Current	40,473	44,451
Loans and Leases Receivable, Gross, Total	40,473	44,451
Commercial | Commercial real estate
Past due aging analysis of loans
Accruing Current	564,959	558,127
Nonaccrual	1,890	2,431
Loans and Leases Receivable, Gross, Total	569,451	563,007
Commercial | Commercial real estate | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	2,602	2,449
Consumer
Past due aging analysis of loans
Accruing Current	647,471	677,367
Nonaccrual	667	631
Loans and Leases Receivable, Gross, Total	649,392	680,059
Consumer | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	1,254	2,061
Consumer | Residential | Real estate first mortgage
Past due aging analysis of loans
Accruing Current	453,574	461,179
Nonaccrual	432	439
Loans and Leases Receivable, Gross, Total	454,958	463,370
Consumer | Residential | Real estate first mortgage | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	952	1,752
Consumer | Residential | Real estate junior lien
Past due aging analysis of loans
Accruing Current	129,917	143,060
Nonaccrual	198	165
Loans and Leases Receivable, Gross, Total	130,299	143,416
Consumer | Residential | Real estate junior lien | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	184	191
Consumer | Other revolving and installment
Past due aging analysis of loans
Accruing Current	63,980	73,128
Nonaccrual	37	27
Loans and Leases Receivable, Gross, Total	64,135	73,273
Consumer | Other revolving and installment | 30 - 89 Days Past Due
Past due aging analysis of loans
Past due	$ 118	$ 118

X

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