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FAIR VALUE DISCLOSURES - Summary of Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed real estate $ 719 $ 710
Mortgage servicing rights 2,671 2,672
Fair Value, Measurements, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 9,841 4,757
Foreclosed real estate 149 175
Mortgage servicing rights 2,532  
Fair Value, Measurements, Nonrecurring | Commercial real estate | Owner-occupied    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 823 881
Fair Value, Measurements, Nonrecurring | Commercial real estate | Non-owner occupied    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 6,181 736
Fair Value, Measurements, Nonrecurring | Commercial real estate | Multi-family    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 207 233
Fair Value, Measurements, Nonrecurring | Commercial real estate | Non-owner occupied residential    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 425 570
Fair Value, Measurements, Nonrecurring | Acquisition and development    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed real estate   74
Fair Value, Measurements, Nonrecurring | Acquisition and development | Commercial and land development    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 2 5
Foreclosed real estate 22  
Fair Value, Measurements, Nonrecurring | Commercial and industrial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 66  
Fair Value, Measurements, Nonrecurring | Residential mortgage    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed real estate 127 101
Fair Value, Measurements, Nonrecurring | Residential mortgage | First lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 1,980 2,094
Fair Value, Measurements, Nonrecurring | Residential mortgage | Home equity - lines of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 150 229
Fair Value, Measurements, Nonrecurring | Installment and other loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 7 9
Fair Value, Measurements, Nonrecurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Foreclosed real estate 0 0
Mortgage servicing rights 0  
Fair Value, Measurements, Nonrecurring | Level 1 | Commercial real estate | Owner-occupied    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Commercial real estate | Non-owner occupied    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Commercial real estate | Multi-family    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Commercial real estate | Non-owner occupied residential    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Acquisition and development    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed real estate   0
Fair Value, Measurements, Nonrecurring | Level 1 | Acquisition and development | Commercial and land development    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Foreclosed real estate 0  
Fair Value, Measurements, Nonrecurring | Level 1 | Commercial and industrial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0  
Fair Value, Measurements, Nonrecurring | Level 1 | Residential mortgage    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed real estate 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Residential mortgage | First lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Residential mortgage | Home equity - lines of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 1 | Installment and other loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Foreclosed real estate 0 0
Mortgage servicing rights 2,532  
Fair Value, Measurements, Nonrecurring | Level 2 | Commercial real estate | Owner-occupied    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Commercial real estate | Non-owner occupied    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Commercial real estate | Multi-family    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Commercial real estate | Non-owner occupied residential    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Acquisition and development    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed real estate   0
Fair Value, Measurements, Nonrecurring | Level 2 | Acquisition and development | Commercial and land development    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Foreclosed real estate 0  
Fair Value, Measurements, Nonrecurring | Level 2 | Commercial and industrial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0  
Fair Value, Measurements, Nonrecurring | Level 2 | Residential mortgage    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed real estate 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Residential mortgage | First lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Residential mortgage | Home equity - lines of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 2 | Installment and other loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 0 0
Fair Value, Measurements, Nonrecurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 9,841 4,757
Foreclosed real estate 149 175
Mortgage servicing rights 0  
Fair Value, Measurements, Nonrecurring | Level 3 | Commercial real estate | Owner-occupied    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 823 881
Fair Value, Measurements, Nonrecurring | Level 3 | Commercial real estate | Non-owner occupied    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 6,181 736
Fair Value, Measurements, Nonrecurring | Level 3 | Commercial real estate | Multi-family    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 207 233
Fair Value, Measurements, Nonrecurring | Level 3 | Commercial real estate | Non-owner occupied residential    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 425 570
Fair Value, Measurements, Nonrecurring | Level 3 | Acquisition and development    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed real estate   74
Fair Value, Measurements, Nonrecurring | Level 3 | Acquisition and development | Commercial and land development    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 2 5
Foreclosed real estate 22  
Fair Value, Measurements, Nonrecurring | Level 3 | Commercial and industrial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 66  
Fair Value, Measurements, Nonrecurring | Level 3 | Residential mortgage    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreclosed real estate 127 101
Fair Value, Measurements, Nonrecurring | Level 3 | Residential mortgage | First lien    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 1,980 2,094
Fair Value, Measurements, Nonrecurring | Level 3 | Residential mortgage | Home equity - lines of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net 150 229
Fair Value, Measurements, Nonrecurring | Level 3 | Installment and other loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, net $ 7 $ 9