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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