Loans and Allowance for Credit Losses - Troubled Debt Restructured Loans, By Concession (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($) contract
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	$ 251
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	254
Post-modification, total modification	251
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 | Substandard
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	$ 251
Commercial | Rate Modification | Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Commercial | Term Modification | Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	254
Post-modification, total modification	251
Commercial | Payment Modification | Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	0
Commercial | Combination Modification | Substandard
Financing Receivable, Troubled Debt Restructuring [Line Items]
Pre-modification, total modification	0
Post-modification, total modification	$ 0