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FAIR VALUE - Summary of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | $ 454,800 | $ 415,308
Fair Value, Measurements, Recurring | Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 454,800 | 415,308
Fair Value, Measurements, Recurring | Debt Securities | States and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 182,793 | 159,458
Fair Value, Measurements, Recurring | Debt Securities | GSE residential MBSs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale |  | 49,530
Fair Value, Measurements, Recurring | Debt Securities | GSE residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 116,955 | 111,119
Fair Value, Measurements, Recurring | Debt Securities | Private label residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 853 | 1,003
Fair Value, Measurements, Recurring | Debt Securities | Private label commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 12,689 | 7,653
Fair Value, Measurements, Recurring | Debt Securities | Asset-backed and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 141,510 | 86,545
Fair Value, Measurements, Recurring | Level 1 | Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Debt Securities | States and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Debt Securities | GSE residential MBSs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale |  | 0
Fair Value, Measurements, Recurring | Level 1 | Debt Securities | GSE residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Debt Securities | Private label residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Debt Securities | Private label commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Debt Securities | Asset-backed and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 454,800 | 415,308
Fair Value, Measurements, Recurring | Level 2 | Debt Securities | States and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 182,793 | 159,458
Fair Value, Measurements, Recurring | Level 2 | Debt Securities | GSE residential MBSs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale |  | 49,530
Fair Value, Measurements, Recurring | Level 2 | Debt Securities | GSE residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 116,955 | 111,119
Fair Value, Measurements, Recurring | Level 2 | Debt Securities | Private label residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 853 | 1,003
Fair Value, Measurements, Recurring | Level 2 | Debt Securities | Private label commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 12,689 | 7,653
Fair Value, Measurements, Recurring | Level 2 | Debt Securities | Asset-backed and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 141,510 | 86,545
Fair Value, Measurements, Recurring | Level 3 | Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Debt Securities | States and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Debt Securities | GSE residential MBSs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale |  | 0
Fair Value, Measurements, Recurring | Level 3 | Debt Securities | GSE residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Debt Securities | Private label residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Debt Securities | Private label commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Debt Securities | Asset-backed and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | $ 0 | $ 0

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