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FAIR VALUE - Summary of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | $ 489,356 | $ 415,308
States and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 159,420 | 159,458
GSE residential MBSs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities |  | 49,530
GSE residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 108,654 | 111,119
Private label residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 312 | 1,003
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 489,356 | 415,308
Fair Value, Measurements, Recurring | States and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 159,420 | 159,458
Fair Value, Measurements, Recurring | GSE residential MBSs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities |  | 49,530
Fair Value, Measurements, Recurring | GSE residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 108,654 | 111,119
Fair Value, Measurements, Recurring | Private label residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 312 | 1,003
Fair Value, Measurements, Recurring | Private label commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 61,210 | 7,653
Fair Value, Measurements, Recurring | Asset-backed and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 159,760 | 86,545
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | States and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | GSE residential MBSs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities |  | 0
Fair Value, Measurements, Recurring | Level 1 | GSE residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Private label residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Private label commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 489,356 | 415,308
Fair Value, Measurements, Recurring | Level 2 | States and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 159,420 | 159,458
Fair Value, Measurements, Recurring | Level 2 | GSE residential MBSs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities |  | 49,530
Fair Value, Measurements, Recurring | Level 2 | GSE residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 108,654 | 111,119
Fair Value, Measurements, Recurring | Level 2 | Private label residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 312 | 1,003
Fair Value, Measurements, Recurring | Level 2 | Private label commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 61,210 | 7,653
Fair Value, Measurements, Recurring | Level 2 | Asset-backed and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 159,760 | 86,545
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | States and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | GSE residential MBSs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities |  | 0
Fair Value, Measurements, Recurring | Level 3 | GSE residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Private label residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Private label commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed and other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, debt securities | $ 0 | $ 0

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