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FAIR VALUE - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
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 $ 4,700,000     $ 4,700,000          
Percentage of discount from appraised value (in hundredths)       3.94%          
Weighted average maturity of residential mortgages       20 years          
Prepayment Speed used in unobservable assumptions       65   81      
Discount rate used to estimate fair value (in hundredths)       9.40%   9.40%      
Subtotal 4,024,611,000     $ 4,024,611,000   $ 3,916,326,000      
Valuation allowance 50,628,000 $ 48,343,000   50,628,000 $ 48,343,000 $ 48,453,000 $ 50,564,000 $ 47,706,000 $ 47,121,000
Provision for Loan and Lease Losses 1,000,000 1,100,000   2,985,000 6,100,000        
Allowance for Loan and Lease Loss, Recovery of Bad Debts 285,000 118,000   779,000 808,000        
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 20,400,000 15,000,000.0   $ 20,400,000 15,000,000.0        
Valuation allowance 10,100,000 5,500,000   10,100,000 5,500,000        
Allowance for Loan and Lease Loss, Recovery of Bad Debts $ 500,000 $ 3,800,000   $ 600,000 $ 8,300,000        
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%