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FAIR VALUE - Summary of Assets Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | $ 401,904 | $ 400,154
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 401,904 | 400,154
Fair Value, Measurements, Recurring | Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 401,793 | 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] |  |
Securities available for sale | 7,334 | 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] |  |
Securities available for sale | 163,431 | 164,282
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 | 104,776 | 116,944
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 | 112,321 | 69,383
Fair Value, Measurements, Recurring | Debt Securities | GSE commercial CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 4,973 | 4,856
Fair Value, Measurements, Recurring | Debt Securities | Private label CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 3,540 | 5,006
Fair Value, Measurements, Recurring | Debt Securities | Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 5,418 |
Fair Value, Measurements, Recurring | Equity securities | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 111 | 91
Fair Value, Measurements, Recurring | Level 1 |  |
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 |  |
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 | U.S. Government Agencies |  |
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 | 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 | GSE 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 | Private label 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 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
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] |  |
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] |  |
Securities available for sale | 401,904 | 400,154
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 | 401,793 | 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] |  |
Securities available for sale | 7,334 | 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] |  |
Securities available for sale | 163,431 | 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] |  |
Securities available for sale | 104,776 | 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] |  |
Securities available for sale | 112,321 | 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] |  |
Securities available for sale | 4,973 | 4,856
Fair Value, Measurements, Recurring | Level 2 | Debt Securities | Private label CMOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 3,540 | 5,006
Fair Value, Measurements, Recurring | Level 2 | Debt Securities | Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 5,418 |
Fair Value, Measurements, Recurring | Level 2 | Equity securities | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 111 | 91
Fair Value, Measurements, Recurring | Level 3 |  |
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 |  |
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 | U.S. Government Agencies |  |
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 | 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 | GSE 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 | Private label 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 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
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] |  |
Securities available for sale | $ 0 | $ 0

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