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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
segment
Jun. 30, 2016
USD ($)
Dec. 31, 2015
investment
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Accounting Policies [Abstract]              
Maturity of interest bearing deposits     90 days        
Evaluation period to return past due loans to accrual status     6 months        
Balance of loans serviced for others $ 328,534   $ 328,534       $ 328,701
Finite-Lived Intangible Assets [Line Items]              
Mortgage servicing rights 2,848   2,848       2,835
Foreclosed real estate $ 1,012   $ 1,012       346
Percentage of limited partner interest 99.00%   99.00%        
Number of investments accounted for under the proportional amortization method | investment         1    
Investment in real estate partnership $ 4,689   $ 4,689       4,909
Investment in real estate partnerships, proportional amortization method           $ 1,888 $ 1,993
Loss investment in real estate partnership 26 $ 89 115 $ 178      
Losses on investments accounted for under the proportional amortization method 52 53 105 86      
Recognition of federal tax credits 252 184 505 368      
Advertising expense $ 214 $ 202 $ 317 $ 353      
Number of significant operating segments | segment     1        
Building and Improvements | Minimum              
Property, Plant and Equipment [Line Items]              
Plant and equipment, useful life     10 years        
Building and Improvements | Maximum              
Property, Plant and Equipment [Line Items]              
Plant and equipment, useful life     40 years        
Furniture and Equipment | Minimum              
Property, Plant and Equipment [Line Items]              
Plant and equipment, useful life     3 years        
Furniture and Equipment | Maximum              
Property, Plant and Equipment [Line Items]              
Plant and equipment, useful life     15 years        
Deposit Premium              
Finite-Lived Intangible Assets [Line Items]              
Finite lives of intangible assets     10 years        
Customer Lists | Minimum              
Finite-Lived Intangible Assets [Line Items]              
Finite lives of intangible assets     10 years        
Customer Lists | Maximum              
Finite-Lived Intangible Assets [Line Items]              
Finite lives of intangible assets     15 years