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FAIR VALUE (Additional Information) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Mar. 31, 2019
Dec. 31, 2017
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 $ 4,600,000     $ 4,600,000        
Percentage of discount from appraised value (in hundredths)       3.95%        
Weighted average maturity of residential mortgages       20 years        
Prepayment Speed used in unobservable assumptions       72   81    
Discount rate used to estimate fair value (in hundredths)       9.40%   9.40%    
Subtotal 4,000,085,000     $ 4,000,085,000   $ 3,916,326,000    
Valuation allowance 50,564,000 $ 47,706,000 $ 45,627,000 50,564,000 $ 47,706,000 $ 48,453,000 $ 49,562,000 $ 47,121,000
Provision for Loan and Lease Losses 785,000 1,700,000   1,985,000 5,000,000      
Allowance for Loan and Lease Loss, Recovery of Bad Debts 301,000 507,000   494,000 690,000      
Minimum                
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.                
Amount of variance       $ 100,000        
Commercial Real Estates | Minimum | Level 3                
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 | Maximum | Level 3                
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 | Minimum | Level 3                
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 | Maximum | Level 3                
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 | Minimum | Level 3                
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 | Maximum | Level 3                
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 | Minimum | Level 3                
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 | Maximum | Level 3                
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 | Minimum | Level 3                
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 | Maximum | Level 3                
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 | Minimum | Level 3                
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 | Maximum | Level 3                
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                
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 18,800,000 9,600,000   $ 18,800,000 9,600,000      
Valuation allowance 9,600,000 2,100,000   9,600,000 2,100,000      
Allowance for Loan and Lease Loss, Recovery of Bad Debts $ 300,000 $ 200,000   $ 100,000 $ 4,500,000      
Charge Off     $ 4,600,000          
Municipal Notes | Minimum                
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 Variance       (5.00%)        
Municipal Notes | Maximum                
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 Variance       5.00%        
US Government Agencies Short-term Debt Securities | Minimum                
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 Variance       (3.00%)        
US Government Agencies Short-term Debt Securities | Maximum                
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 Variance       3.00%        
US Treasury Securities | Minimum                
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 Variance       (1.00%)        
US Treasury Securities | Maximum                
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 Variance       1.00%