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Fair Value Measurements - Fair Value Measurement on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | $ 1,049,524 | $ 802,163
U.S. government and agency securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 103,647 | 45,660
Municipal securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 228,927 | 209,968
Residential CMO and MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale |  | 201,872
Commercial CMO and MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale |  | 303,746
Corporate obligations |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale |  | 11,096
Other asset-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale |  | 29,821
Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 |
Recurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale |  | 802,163
Equity security | 181 | 131
Recurring | U.S. government and agency securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 103,647 | 45,660
Recurring | Municipal securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 228,927 | 209,968
Recurring | Residential CMO and MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 259,494 | 201,872
Recurring | Commercial CMO and MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 421,940 | 303,746
Recurring | Corporate obligations |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 7,018 | 11,096
Recurring | Other asset-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 28,498 | 29,821
Recurring | Interest rate swap |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative assets - interest rate swaps | 19,342 | 25,740
Derivative liabilities - interest rate swaps | 19,510 | 26,162
Recurring | Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale |  | 0
Equity security | 181 | 131
Recurring | Level 1 | U.S. government and agency securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Recurring | Level 1 | Municipal securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Recurring | Level 1 | Residential CMO and MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Recurring | Level 1 | Commercial CMO and MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Recurring | Level 1 | Corporate obligations |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Recurring | Level 1 | Other asset-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Recurring | Level 1 | Interest rate swap |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative assets - interest rate swaps | 0 | 0
Derivative liabilities - interest rate swaps | 0 | 0
Recurring | Level 2 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 1,049,524 | 802,163
Equity security | 0 | 0
Recurring | Level 2 | U.S. government and agency securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 103,647 | 45,660
Recurring | Level 2 | Municipal securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 228,927 | 209,968
Recurring | Level 2 | Residential CMO and MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale |  | 201,872
Recurring | Level 2 | Commercial CMO and MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale |  | 303,746
Recurring | Level 2 | Corporate obligations |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale |  | 11,096
Recurring | Level 2 | Other asset-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale |  | 29,821
Recurring | Level 2 | Interest rate swap |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative assets - interest rate swaps | 19,342 | 25,740
Derivative liabilities - interest rate swaps | 19,510 | 26,162
Recurring | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Equity security | 0 | 0
Recurring | Level 3 | U.S. government and agency securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Recurring | Level 3 | Municipal securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Recurring | Level 3 | Residential CMO and MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Recurring | Level 3 | Commercial CMO and MBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Recurring | Level 3 | Corporate obligations |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Recurring | Level 3 | Other asset-backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Total investment securities available for sale | 0 | 0
Recurring | Level 3 | Interest rate swap |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative assets - interest rate swaps | 0 | 0
Derivative liabilities - interest rate swaps | $ 0 | $ 0

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