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Fair Value Measurements - Fair Value Measurement on Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | $ (77) | $ 0 | $ (700) | $ (10) |
Assets, Fair Value Disclosure | 4,467 |  | 4,467 |  | $ 2,635
Level 1 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Assets, Fair Value Disclosure | 0 |  | 0 |  | 0
Level 2 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Assets, Fair Value Disclosure | 0 |  | 0 |  | 0
Level 3 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Assets, Fair Value Disclosure | 3,047 |  | 3,047 |  | 2,619
Impaired Loans |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 2,242 |  | 2,242 |  |
Net Losses (Gains) Recorded in Earnings | (39) | 0 | (662) | (10) |
Assets, Fair Value Disclosure | 3,662 |  | 3,662 |  |
Impaired Loans | Level 1 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 0 |  | 0 |  |
Impaired Loans | Level 2 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 0 |  | 0 |  |
Impaired Loans | Level 3 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 2,242 |  | 2,242 |  | 1,289
Impaired Loans | Commercial Portfolio Segment |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 1,708 |  | 1,708 |  |
Net Losses (Gains) Recorded in Earnings | (39) | 0 | (624) | (10) |
Assets, Fair Value Disclosure | 2,671 |  | 2,671 |  |
Impaired Loans | Commercial Portfolio Segment | Level 1 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 0 |  | 0 |  |
Impaired Loans | Commercial Portfolio Segment | Level 2 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 0 |  | 0 |  |
Impaired Loans | Commercial Portfolio Segment | Level 3 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 1,708 |  | 1,708 |  |
Impaired Loans | Commercial Portfolio Segment | Commercial and Industrial |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 1,222 |  | 1,222 |  | 1,289
Net Losses (Gains) Recorded in Earnings | (54) | 0 | (563) | (10) |
Assets, Fair Value Disclosure | 2,058 |  | 2,058 |  | 1,305
Impaired Loans | Commercial Portfolio Segment | Commercial and Industrial | Level 1 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 0 |  | 0 |  | 0
Impaired Loans | Commercial Portfolio Segment | Commercial and Industrial | Level 2 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 0 |  | 0 |  | 0
Impaired Loans | Commercial Portfolio Segment | Commercial and Industrial | Level 3 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 1,222 |  | 1,222 |  | 1,289
Impaired Loans | Commercial Portfolio Segment | Owner Occupied Commercial Real Estate |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 486 |  | 486 |  |
Net Losses (Gains) Recorded in Earnings | 15 | 0 | (61) | 0 |
Assets, Fair Value Disclosure | 613 |  | 613 |  |
Impaired Loans | Commercial Portfolio Segment | Owner Occupied Commercial Real Estate | Level 1 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 0 |  | 0 |  |
Impaired Loans | Commercial Portfolio Segment | Owner Occupied Commercial Real Estate | Level 2 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 0 |  | 0 |  |
Impaired Loans | Commercial Portfolio Segment | Owner Occupied Commercial Real Estate | Level 3 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 486 |  | 486 |  |
Impaired Loans | Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 534 |  | 534 |  |
Net Losses (Gains) Recorded in Earnings | 0 | $ 0 | (38) | $ 0 |
Assets, Fair Value Disclosure | 991 |  | 991 |  |
Impaired Loans | Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties | Level 1 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 0 |  | 0 |  |
Impaired Loans | Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties | Level 2 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 0 |  | 0 |  |
Impaired Loans | Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties | Level 3 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Fair Value | 534 |  | 534 |  |
Branch held for sale |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Basis | 805 |  | 805 |  |
Fair Value |  |  |  |  | 1,330
Assets, Fair Value Disclosure | 805 |  | 805 |  | 1,330
Branch held for sale | Level 1 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Basis | 0 |  | 0 |  |
Fair Value |  |  |  |  | 0
Branch held for sale | Level 2 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Basis | 0 |  | 0 |  |
Fair Value |  |  |  |  | 0
Branch held for sale | Level 3 |  |  |  |  |
Fair value measurements of assets on a nonrecurring basis |  |  |  |  |
Basis | 805 |  | 805 |  |
Fair Value | $ 805 |  | $ 805 |  | $ 1,330

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