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FAIR VALUE - Summary of Assets Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | $ 400,154 | $ 394,124
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 400,154 | 394,124
Fair Value, Measurements, Recurring | Debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 400,063 | 394,051
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 | 47,227
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 | 164,282 | 125,961
Fair Value, Measurements, Recurring | Debt securities | GSE residential mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 116,944 | 132,349
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 | 69,383 | 15,843
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 | 63,770
Fair Value, Measurements, Recurring | Debt securities | Private label CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 5,006 | 8,901
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 | 91 | 73
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 | 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 mortgage-backed 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 | 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 | 0
Fair Value, Measurements, Recurring | Level 1 | Debt securities | Private label 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 | 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 | 400,154 | 394,124
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 | 400,063 | 394,051
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 | 47,227
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 | 164,282 | 125,961
Fair Value, Measurements, Recurring | Level 2 | Debt securities | GSE residential mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 116,944 | 132,349
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 | 69,383 | 15,843
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 | 63,770
Fair Value, Measurements, Recurring | Level 2 | Debt securities | Private label CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total securities available for sale | 5,006 | 8,901
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 | 91 | 73
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 | 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 mortgage-backed 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 | 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 | 0
Fair Value, Measurements, Recurring | Level 3 | Debt securities | Private label 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 | 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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