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Fair Value Measurements - Fair Value Measurement on Nonrecurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Nonrecurring |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Basis | $ 2,635 |  |
Fair Value | 2,619 |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 638 | $ 78 | $ 168
Nonrecurring | Level 1 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 |  |
Nonrecurring | Level 2 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 |  |
Nonrecurring | Level 3 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 2,619 |  |
Nonrecurring | Impaired Loans |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Basis |  | 4,111 |
Fair Value |  | 3,380 |
Nonrecurring | Impaired Loans | Level 1 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value |  | 0 |
Nonrecurring | Impaired Loans | Level 2 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value |  | 0 |
Nonrecurring | Impaired Loans | Level 3 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 1,289 | 3,380 |
Nonrecurring | Impaired Loans | Commercial and industrial |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Basis |  | 4,111 |
Fair Value |  | 3,380 |
Nonrecurring | Impaired Loans | Commercial and industrial | Level 1 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value |  | 0 |
Nonrecurring | Impaired Loans | Commercial and industrial | Level 2 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value |  | 0 |
Nonrecurring | Impaired Loans | Commercial and industrial | Level 3 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value |  | 3,380 |
Nonrecurring | Impaired Loans | Commercial business |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Net Losses (Gains) Recorded in Earnings | 8 | 78 | 160
Nonrecurring | Impaired Loans | Commercial business | Commercial and industrial |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Basis | 1,305 |  |
Fair Value | 1,289 |  |
Net Losses (Gains) Recorded in Earnings | 8 | 78 | 10
Nonrecurring | Impaired Loans | Commercial business | Commercial and industrial | Level 1 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 |  |
Nonrecurring | Impaired Loans | Commercial business | Commercial and industrial | Level 2 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 |  |
Nonrecurring | Impaired Loans | Commercial business | Commercial and industrial | Level 3 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 1,289 |  |
Nonrecurring | Impaired Loans | Commercial business | Non-owner occupied CRE |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Net Losses (Gains) Recorded in Earnings | 0 | 0 | 150
Nonrecurring | Impaired Loans | Consumer |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Net Losses (Gains) Recorded in Earnings | 0 | 0 | 8
Nonrecurring | Impaired Loans | Branch held for sale |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Net Losses (Gains) Recorded in Earnings | 630 | 0 | $ 0
Nonrecurring | Branch held for sale |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Basis | 1,330 |  |
Fair Value | 1,330 |  |
Nonrecurring | Branch held for sale | Level 1 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 |  |
Nonrecurring | Branch held for sale | Level 2 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 0 |  |
Nonrecurring | Branch held for sale | Level 3 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value | 1,330 |  |
Reported Value Measurement |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Interest Rate Derivative Liabilities, at Fair Value | 26,162 | 8,318 |
Fair Value | $ 4,398,462 | $ 3,731,708 |

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