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FAIR VALUE - Summary of Assets and Liabilities measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets measured at fair value on recurring basis |  |
Available for sale securities | $ 638,291 | $ 680,886
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 | 29,050
State and municipal obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 34,964 | 40,731
U.S. GSE residential mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 84,691 | 93,538
U.S. GSE residential collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 277,851 | 357,777
U.S. GSE commercial mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 13,609 | 3,508
U.S. GSE commercial collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 104,156 | 90,638
Other asset backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 23,401 | 23,219
Corporate bonds |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 43,802 | 42,425
Carrying Amount |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 638,291 | 680,886
Financial Assets: Derivatives | 15,437 | 6,363
Financial Liabilities: |  |
Financial liabilities: Derivatives | 16,645 | 2,215
Fair Value |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 638,291 | 680,886
Financial Assets: Derivatives | 15,437 | 6,363
Financial Liabilities: |  |
Financial liabilities: Derivatives | 16,645 | 2,215
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 | 638,291 | 680,886
Financial Assets: Derivatives | 15,437 | 6,363
Financial Liabilities: |  |
Financial liabilities: Derivatives | 16,645 | 2,215
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 | 638,291 | 680,886
Recurring basis | Carrying Amount | U.S. Treasury securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 50,822 |
Recurring basis | Carrying Amount | U.S. GSE securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 4,995 | 29,050
Recurring basis | Carrying Amount | State and municipal obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 34,964 | 40,731
Recurring basis | Carrying Amount | U.S. GSE residential mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 84,691 | 93,538
Recurring basis | Carrying Amount | U.S. GSE residential collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 277,851 | 357,777
Recurring basis | Carrying Amount | U.S. GSE commercial mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 13,609 | 3,508
Recurring basis | Carrying Amount | U.S. GSE commercial collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 104,156 | 90,638
Recurring basis | Carrying Amount | Other asset backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 23,401 | 23,219
Recurring basis | Carrying Amount | Corporate bonds |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 43,802 | 42,425
Recurring basis | Carrying Amount | Derivatives |  |
Assets measured at fair value on recurring basis |  |
Financial Assets: Derivatives | 15,437 | 6,363
Financial Liabilities: |  |
Financial liabilities: Derivatives | 16,645 | 2,215
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 638,291 | 680,886
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value | 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) | Fair Value | U.S. GSE securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 4,995 | 29,050
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value | State and municipal obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 34,964 | 40,731
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value | U.S. GSE residential mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 84,691 | 93,538
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value | U.S. GSE residential collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 277,851 | 357,777
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value | U.S. GSE commercial mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 13,609 | 3,508
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value | U.S. GSE commercial collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 104,156 | 90,638
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value | Other asset backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 23,401 | 23,219
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value | Corporate bonds |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 43,802 | 42,425
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value | Derivatives |  |
Assets measured at fair value on recurring basis |  |
Financial Assets: Derivatives | 15,437 | 6,363
Financial Liabilities: |  |
Financial liabilities: Derivatives | $ 16,645 | $ 2,215

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