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FAIR VALUE (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets measured at fair value on recurring basis |  |
Available for sale securities | $ 792,058 | $ 819,722
U.S. GSE securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 64,228 | 63,649
State and municipal obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 91,320 | 116,165
U.S. GSE residential mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 193,404 | 158,048
U.S. GSE residential collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 319,202 | 367,511
U.S. GSE commercial mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 6,153 | 6,307
U.S. GSE commercial collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 50,386 | 55,192
Other asset backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 23,037 | 22,553
Corporate bonds |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 44,328 | 30,297
Carrying Value |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 792,058 | 819,722
Financial Assets: Derivatives | 2,447 | 2,510
Financial Liabilities: |  |
Financial liabilities: Derivatives | 1,719 | 1,670
Fair Value |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 792,058 | 819,722
Financial Assets: Derivatives | 2,447 | 2,510
Financial Liabilities: |  |
Financial liabilities: Derivatives | 1,719 | 1,670
Significant Other Observable Inputs (Level 2) | Fair Value |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 792,058 | 819,722
Financial Assets: Derivatives | 2,447 | 2,510
Financial Liabilities: |  |
Financial liabilities: Derivatives | 1,719 | 1,670
Recurring basis | Carrying Value |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 792,058 | 819,722
Recurring basis | Carrying Value | U.S. GSE securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 64,228 | 63,649
Recurring basis | Carrying Value | State and municipal obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 91,320 | 116,165
Recurring basis | Carrying Value | U.S. GSE residential mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 193,404 | 158,048
Recurring basis | Carrying Value | U.S. GSE residential collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 319,202 | 367,511
Recurring basis | Carrying Value | U.S. GSE commercial mortgage-backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 6,153 | 6,307
Recurring basis | Carrying Value | U.S. GSE commercial collateralized mortgage obligations |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 50,386 | 55,192
Recurring basis | Carrying Value | Other asset backed securities |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 23,037 | 22,553
Recurring basis | Carrying Value | Corporate bonds |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 44,328 | 30,297
Recurring basis | Carrying Value | Derivatives |  |
Assets measured at fair value on recurring basis |  |
Financial Assets: Derivatives | 2,447 | 2,510
Financial Liabilities: |  |
Financial liabilities: Derivatives | 1,719 | 1,670
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 792,058 | 819,722
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 | 64,228 | 63,649
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 | 91,320 | 116,165
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 | 193,404 | 158,048
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 | 319,202 | 367,511
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 | 6,153 | 6,307
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 | 50,386 | 55,192
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 | 23,037 | 22,553
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value | Corporate bonds |  |
Assets measured at fair value on recurring basis |  |
Available for sale securities | 44,328 | 30,297
Recurring basis | Significant Other Observable Inputs (Level 2) | Fair Value | Derivatives |  |
Assets measured at fair value on recurring basis |  |
Financial Assets: Derivatives | 2,447 | 2,510
Financial Liabilities: |  |
Financial liabilities: Derivatives | $ 1,719 | $ 1,670

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