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FAIR VALUE - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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 $ 4,400,000      
Percentage of discount from appraised value (in hundredths) 3.90%      
Weighted average maturity of residential mortgages 20 years      
Prepayment Speed used in unobservable assumptions 118 81    
Discount rate used to estimate fair value (in hundredths) 9.40% 9.40%    
Subtotal $ 4,067,385,000 $ 3,916,326,000    
Valuation allowance 50,652,000 48,453,000 $ 47,121,000 $ 43,718,000
Provision for Loan and Lease Losses 3,235,000 6,400,000 3,000,000  
Allowance for Loan and Lease Loss, Recovery of Bad Debts 874,000 1,043,000 $ 1,963,000  
Ten Percent Adverse Changes In Psa        
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 124,000      
Twenty Percent Adverse Changes In Psa        
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 242,000      
Ten Percent Adverse Changes In Discount Rate        
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 170,000      
Twenty Percent Adverse Changes In Discount Rate        
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 329,000      
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      
Minimum | Municipal Notes        
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%)      
Minimum | US Government Agencies Short-term Debt Securities        
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%)      
Minimum | US Treasury Securities        
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%)      
Maximum | Municipal Notes        
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%      
Maximum | US Government Agencies Short-term Debt Securities        
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%      
Maximum | US Treasury Securities        
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%      
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 $ 22,200,000 21,000,000.0    
Valuation allowance 10,100,000 9,500,000    
Allowance for Loan and Lease Loss, Recovery of Bad Debts 600,000,000,000 7,100,000    
Other Real Estate Owned        
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.        
Impaired Loans Fair Value Disclosure $ 316,000 $ 316,000