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FAIR VALUE - Summary of Assets Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | $ 415,308 | $ 400,154
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 415,308 | 400,154
Fair Value, Measurements, Recurring | Debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 415,194 | 400,063
Fair Value, Measurements, Recurring | Debt securities | U.S. Government Agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale |  | 39,592
Fair Value, Measurements, Recurring | Debt securities | States and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 159,458 | 164,282
Fair Value, Measurements, Recurring | Debt securities | GSE residential MBSs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 49,530 | 116,944
Fair Value, Measurements, Recurring | Debt securities | GSE residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 111,119 | 69,383
Fair Value, Measurements, Recurring | Debt securities | GSE commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale |  | 4,856
Fair Value, Measurements, Recurring | Debt securities | Private label residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 1,003 | 5,006
Fair Value, Measurements, Recurring | Debt securities | Private label commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 7,653 |
Fair Value, Measurements, Recurring | Debt securities | Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 86,431 |
Fair Value, Measurements, Recurring | Equity securities | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 114 | 91
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Debt securities | U.S. Government Agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale |  | 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] |  |
Total 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] |  |
Total securities available for sale | 0 | 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] |  |
Total securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Debt securities | GSE commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale |  | 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] |  |
Total 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] |  |
Total securities available for sale | 0 |
Fair Value, Measurements, Recurring | Level 1 | Debt securities | Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 0 |
Fair Value, Measurements, Recurring | Level 1 | Equity securities | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 415,308 | 400,154
Fair Value, Measurements, Recurring | Level 2 | Debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 415,194 | 400,063
Fair Value, Measurements, Recurring | Level 2 | Debt securities | U.S. Government Agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale |  | 39,592
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] |  |
Total securities available for sale | 159,458 | 164,282
Fair Value, Measurements, Recurring | Level 2 | Debt securities | GSE residential MBSs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 49,530 | 116,944
Fair Value, Measurements, Recurring | Level 2 | Debt securities | GSE residential CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 111,119 | 69,383
Fair Value, Measurements, Recurring | Level 2 | Debt securities | GSE commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale |  | 4,856
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] |  |
Total securities available for sale | 1,003 | 5,006
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] |  |
Total securities available for sale | 7,653 |
Fair Value, Measurements, Recurring | Level 2 | Debt securities | Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 86,431 |
Fair Value, Measurements, Recurring | Level 2 | Equity securities | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 114 | 91
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Debt securities | U.S. Government Agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale |  | 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] |  |
Total 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] |  |
Total securities available for sale | 0 | 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] |  |
Total securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Debt securities | GSE commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale |  | 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] |  |
Total 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] |  |
Total securities available for sale | 0 |
Fair Value, Measurements, Recurring | Level 3 | Debt securities | Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 0 |
Fair Value, Measurements, Recurring | Level 3 | Equity securities | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | $ 0 | $ 0

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