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Loans and Allowance for Credit Losses - Loans Modified as Troubled Debt Restructurings During Period (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) Modification	Mar. 31, 2020 USD ($) Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	2	3
Financing Receivables, Modifications during Period, Balance | $	$ 16	$ 323
Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	0	1
Financing Receivables, Modifications during Period, Balance | $	$ 0	$ 305
Commercial Real Estate | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	0	1
Financing Receivables, Modifications during Period, Balance | $	$ 0	$ 305
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	0	1
Financing Receivables, Modifications during Period, Balance | $	$ 0	$ 7
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, Modifications during Period, Number | Modification	2	1
Financing Receivables, Modifications during Period, Balance | $	$ 16	$ 11

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