Loans and Allowance for Credit Losses - Troubled Debt Restructured Loans, By Concession (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	3	2
Pre-modification, total modification	$ 974	$ 3,413
Post-modification, number of contracts | contract	3	2
Post-modification, total modification	$ 1,186	$ 1,728
Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	0	0
Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	1,191	3,249
Post-modification, total modification	1,186	1,565
Payment Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	164
Post-modification, total modification	0	163
Combination Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	$ 0	$ 0
Commercial & industrial loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	1	2
Pre-modification, total modification	$ 254	$ 3,413
Post-modification, number of contracts | contract	1	2
Post-modification, total modification	$ 249	$ 1,728
Commercial & industrial loans | Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	0	0
Commercial & industrial loans | Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	254	3,249
Post-modification, total modification	249	1,565
Commercial & industrial loans | Payment Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	164
Post-modification, total modification	0	163
Commercial & industrial loans | Combination Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0	0
Post-modification, total modification	$ 0	$ 0
Commercial real estate | Owner occupied properties
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	1
Pre-modification, total modification	$ 360
Post-modification, number of contracts | contract	1
Post-modification, total modification	$ 360
Commercial real estate | Owner occupied properties | Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Commercial real estate | Owner occupied properties | Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	360
Post-modification, total modification	360
Commercial real estate | Owner occupied properties | Payment Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Commercial real estate | Owner occupied properties | Combination Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	$ 0
Other construction, land development and raw land loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	1
Pre-modification, total modification	$ 360
Post-modification, number of contracts | contract	1
Post-modification, total modification	$ 577
Other construction, land development and raw land loans | Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Other construction, land development and raw land loans | Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	577
Post-modification, total modification	577
Other construction, land development and raw land loans | Payment Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Other construction, land development and raw land loans | Combination Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	$ 0