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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
12 Months Ended
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of Significant Accounting Policies [Line Items]        
Accrued Interest On Loans   $ 11,500,000 $ 11,800,000  
Financing Receivable, Net   250,000    
Equity Method Investments   6,700,000 7,000,000.0  
Real Estate Acquired Through Foreclosure   316,000 316,000  
Servicing fees   $ 1,100,000 $ 1,100,000 $ 1,000,000.0
Treasury Stock Shares   178,741 172,959  
Bank Owned Life Insurance   $ 83,848,000 $ 77,106,000  
Cash on hand or on deposit to meet regulatory reserve and clearing requirements   28,900,000 6,400,000  
Carrying value of mortgage servicing rights   3,800,000 3,300,000  
Unpaid principal balances   337,900,000 343,500,000  
Cash Available for Distributions   1,600,000 2,100,000  
Operating Lease, Right-of-Use Asset   5,100,000    
Accounting Standards Update 2017-08        
Summary of Significant Accounting Policies [Line Items]        
Cumulative period adjustment made to retained earnings $ 1,300,000      
Accounting Standards Update 2016-02        
Summary of Significant Accounting Policies [Line Items]        
Operating Lease, Right-of-Use Asset 5,500,000      
Operating Lease, Liability, Noncurrent 5,500,000      
Cumulative period adjustment made to retained earnings $ 0      
Interest Rate Swap [Member]        
Summary of Significant Accounting Policies [Line Items]        
Notional amount   349,600,000 258,000,000.0  
Fair value of interest rate swap asset   7,300,000 3,900,000  
Fair value of interest rate swap liability   7,900,000 4,000,000.0  
Life Insurance [Member] | Officer [Member]        
Summary of Significant Accounting Policies [Line Items]        
Bank Owned Life Insurance   79,800,000 73,900,000  
Deferred Compensation Plan [Member] | Officer [Member]        
Summary of Significant Accounting Policies [Line Items]        
Bank Owned Life Insurance   $ 4,000,000.0 $ 3,200,000  
Minimum        
Summary of Significant Accounting Policies [Line Items]        
Percentage of increase in allowance for credit losses   8.00%    
Maximum        
Summary of Significant Accounting Policies [Line Items]        
Percentage of increase in allowance for credit losses   13.00%    
Premises and Improvements Assets [Member] | Minimum        
Summary of Significant Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life   5 years    
Premises and Improvements Assets [Member] | Maximum        
Summary of Significant Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life   40 years    
Equipment and Furniture Assets [Member] | Minimum        
Summary of Significant Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life   3 years    
Equipment and Furniture Assets [Member] | Maximum        
Summary of Significant Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life   7 years