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FAIR VALUE DISCLOSURES (Additional Information) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Mar. 31, 2017
Dec. 31, 2015
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Mortgage servicing rights   $ 3,900,000   $ 3,900,000        
Weighted average interest rate, residential mortgages (in hundredths)       3.82%        
Weighted average maturity of residential mortgages       19 years        
Prepayment Speed used in unobservable assumptions       148   162    
Discount rate used to estimate fair value (in hundredths)       9.40%   9.30%    
Subtotal   3,578,225,000   $ 3,578,225,000   $ 3,471,668,000    
Valuation allowance $ 43,284,000 44,563,000 $ 43,247,000 44,563,000 $ 43,247,000 $ 43,718,000 $ 43,774,000 $ 43,610,000
Recoveries   550,000 260,000 $ 909,000 399,000      
Municipal Bonds [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 $ 339,000              
Commercial Real Estates [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Percentage of discount from appraised value (in hundredths)       0.00%        
Commercial Real Estates [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Percentage of discount from appraised value (in hundredths)       50.00%        
Inventory Finished Goods [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Percentage of discount from appraised value (in hundredths)       35.00%        
Inventory Finished Goods [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Percentage of discount from appraised value (in hundredths)       65.00%        
Finished Goods [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Percentage of discount from appraised value (in hundredths)       30.00%        
Finished Goods [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Percentage of discount from appraised value (in hundredths)       60.00%        
Inventory Work In Process [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Percentage of discount from appraised value (in hundredths)       50.00%        
Inventory Work In Process [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Percentage of discount from appraised value (in hundredths)       100.00%        
Equipment [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Percentage of discount from appraised value (in hundredths)       30.00%        
Equipment [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Percentage of discount from appraised value (in hundredths)       70.00%        
Marketable Securities [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Percentage of discount from appraised value (in hundredths)       10.00%        
Marketable Securities [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Percentage of discount from appraised value (in hundredths)       30.00%        
Impaired Loans [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Subtotal   10,000,000 6,400,000 $ 10,000,000 6,400,000      
Valuation allowance   3,700,000 2,500,000 3,700,000 2,500,000      
Recoveries   200,000 0 600,000 100,000      
Other Real Estate Owned [Member]                
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.                
Other Real Estate   147,000 147,000 147,000 147,000      
Real Estate Owned, Valuation Allowance   72,000 72,000 72,000 72,000      
Impaired Loans Fair Value Disclosure   $ 75,000 $ 75,000 $ 75,000 $ 75,000