Loans and Allowance for Credit Losses - Troubled Debt Restructured Loans, By Concession (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	3
Pre-modification, total modification	$ 1,191
Post-modification, number of contracts | contract	3
Post-modification, total modification	$ 1,186
Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	1,191
Post-modification, total modification	1,186
Payment Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Combination Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	$ 0
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, number of contracts | contract	1
Pre-modification, total modification	$ 254
Post-modification, number of contracts | contract	1
Post-modification, total modification	$ 249
Commercial | Rate Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Commercial | Term Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	254
Post-modification, total modification	249
Commercial | Payment Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Commercial | Combination Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	$ 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	$ 577
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