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Fair Value Measurements - Fair Value of Financial Assets Measured on a Nonrecurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans (collateral dependent) | $ 31,075 | $ 66,209
Foreclosed assets and other real estate owned | 2,661 | 17,074
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans (collateral dependent) | 0 | 0
Foreclosed assets and other real estate owned | 0 | 0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans (collateral dependent) | 0 | 0
Foreclosed assets and other real estate owned | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans (collateral dependent) | 31,075 | 66,209
Foreclosed assets and other real estate owned | 2,661 | 17,074
Collateral Pledged |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loan, related allowance | $ 2,129 | $ 13,725

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