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Loans and Allowance for Credit Losses - Loans Modified as Troubled Debt Restructurings During Period (Details) $ in Thousands | 3 Months Ended
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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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