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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
segment
component
office
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
investment
Accounting Policies [Abstract]      
Number of offices in which the company operates throughout the country | office 21    
Accounting Policies [Line Items]      
Impairment charge related to investment $ 0    
Held to maturity or trading securities $ 0   $ 0
Number of impairment components | component 2    
Debt securities other than temporarily impaired $ 0   0
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 $ 324,221,000   317,793,000
Foreclosed real estate totaled $ 495,000   $ 710,000
Percentage of limited partner interest 99.00%    
Number of investments accounted for under the proportional amortization method | investment     1
Investment in real estate partnership $ 5,328,000   $ 5,450,000
Investment in real estate partnerships, proportional amortization method 2,150,000   2,205,000
Loss investment in real estate partnership 89,000 $ 85,000  
Losses on investments accounted for under the proportional amortization method 33,000    
Recognition of federal tax credits 184,000 119,000  
Advertising expense 151,000 $ 112,000  
Accumulated other comprehensive income (loss), net of taxes $ 4,434,000   1,199,000
Number of significant operating segment | segment 1    
Other Assets      
Accounting Policies [Line Items]      
Mortgage servicing rights $ 2,710,000   $ 2,672,000
Deposit Premium      
Accounting Policies [Line Items]      
Finite lives of intangible assets 10 years    
Customer Lists      
Accounting Policies [Line Items]      
Finite lives of intangible assets 15 years    
Minimum | Building and Improvements      
Accounting Policies [Line Items]      
Plant and equipment, useful life 10 years    
Minimum | Furniture and Equipment      
Accounting Policies [Line Items]      
Plant and equipment, useful life 3 years    
Maximum      
Accounting Policies [Line Items]      
Cash and cash equivalents, original maturities 90 days    
Maximum | Building and Improvements      
Accounting Policies [Line Items]      
Plant and equipment, useful life 40 years    
Maximum | Furniture and Equipment      
Accounting Policies [Line Items]      
Plant and equipment, useful life 15 years