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FAIR VALUE DISCLOSURES (Additional Information) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
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   $ 4,000,000   $ 4,000,000          
Weighted average interest rate, residential mortgages (in hundredths)       3.81%          
Weighted average maturity of residential mortgages       19 years          
Prepayment Speed used in unobservable assumptions       134   162      
Discount rate used to estimate fair value (in hundredths)       9.40%   9.30%      
Subtotal   3,636,431,000   $ 3,636,431,000   $ 3,471,668,000      
Valuation allowance   45,497,000 $ 42,853,000 45,497,000 $ 42,853,000 $ 43,718,000 $ 44,563,000 $ 43,247,000 $ 43,610,000
Recoveries   654,000 379,000 $ 1,563,000 778,000        
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   7,800,000 6,700,000 $ 7,800,000 6,700,000        
Valuation allowance   2,900,000 2,400,000 2,900,000 2,400,000        
Recoveries   800,000 $ 100,000 200,000 $ 0        
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          
Real Estate Owned, Valuation Allowance   72,000   72,000          
Impaired Loans Fair Value Disclosure   $ 75,000   $ 75,000