Loans and Allowance for Credit Losses - Net Charge-offs By Year of Origination (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	$ 6	$ 6
2022	0	0
2021	2	72
2020	0	0
2019	0	0
2018 and Prior	16	1,363
Revolving loans	569	569
Revolving loans converted to term loans	150	375
Gross Charge-offs	743	2,385
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	6	6
2022	0	0
2021	2	72
2020	0	0
2019	0	0
2018 and Prior	11	1,358
Revolving loans	569	569
Revolving loans converted to term loans	150	375
Gross Charge-offs	738	2,380
Energy [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018 and Prior	0	0
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Gross Charge-offs	0	0
Commercial Real Estate - Owner-Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018 and Prior	0	0
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Gross Charge-offs	0	0
Commercial Real Estate - Non-Owner-Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018 and Prior	0	0
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Gross Charge-offs	0	0
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018 and Prior	0	0
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Gross Charge-offs	0	0
Consumer [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018 and Prior	5	5
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Gross Charge-offs	$ 5	$ 5