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FAIR VALUE - Summary of Assets and Liabilities measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets measured at fair value on recurring basis |  |
Available for sale securities | $ 466,081 | $ 638,291
Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 466,081 | 638,291
Financial Assets: Derivatives | 59,385 | 15,437
Financial Liabilities: |  |
Financial liabilities: Derivatives | 67,341 | 16,645
Fair Value |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 466,081 | 638,291
Financial Assets: Derivatives | 59,385 | 15,437
Financial Liabilities: |  |
Financial liabilities: Derivatives | 67,341 | 16,645
U.S. Treasury securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities |  | 50,822
U.S. GSE securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities |  | 4,995
State and municipal obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 36,504 | 34,964
U.S. GSE residential mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 118,876 | 84,691
U.S. GSE residential collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 161,582 | 277,851
U.S. GSE commercial mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 13,368 | 13,609
U.S. GSE commercial collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 64,792 | 104,156
Other asset backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 23,894 | 23,401
Corporate bonds |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 47,065 | 43,802
Quoted Prices In Active Markets for Identical Assets (Level 1) |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 0 | 0
Financial Assets: Derivatives | 0 | 0
Financial Liabilities: |  |
Financial liabilities: Derivatives | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 466,081 | 638,291
Financial Assets: Derivatives | 59,385 | 15,437
Financial Liabilities: |  |
Financial liabilities: Derivatives | 67,341 | 16,645
Significant Unobservable Inputs (Level 3) |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 0 | 0
Financial Assets: Derivatives | 0 | 0
Financial Liabilities: |  |
Financial liabilities: Derivatives | 0 | 0
Recurring basis | Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 466,081 | 638,291
Recurring basis | U.S. Treasury securities | Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities |  | 50,822
Recurring basis | U.S. GSE securities | Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities |  | 4,995
Recurring basis | State and municipal obligations | Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 36,504 | 34,964
Recurring basis | U.S. GSE residential mortgage-backed securities | Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 118,876 | 84,691
Recurring basis | U.S. GSE residential collateralized mortgage obligations | Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 161,582 | 277,851
Recurring basis | U.S. GSE commercial mortgage-backed securities | Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 13,368 | 13,609
Recurring basis | U.S. GSE commercial collateralized mortgage obligations | Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 64,792 | 104,156
Recurring basis | Other asset backed securities | Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 23,894 | 23,401
Recurring basis | Corporate bonds | Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 47,065 | 43,802
Recurring basis | Derivatives | Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Financial Assets: Derivatives | 59,385 | 15,437
Financial Liabilities: |  |
Financial liabilities: Derivatives | 67,341 | 16,645
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 466,081 | 638,291
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities |  | 50,822
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities |  | 4,995
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 36,504 | 34,964
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE residential mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 118,876 | 84,691
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE residential collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 161,582 | 277,851
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE commercial mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 13,368 | 13,609
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE commercial collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 64,792 | 104,156
Recurring basis | Significant Other Observable Inputs (Level 2) | Other asset backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 23,894 | 23,401
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 47,065 | 43,802
Recurring basis | Significant Other Observable Inputs (Level 2) | Derivatives |  |
Assets measured at fair value on recurring basis |  |
Financial Assets: Derivatives | 59,385 | 15,437
Financial Liabilities: |  |
Financial liabilities: Derivatives | $ 67,341 | $ 16,645

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