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INCOME TAXES - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]        
Tax credits on investments in alternative energy partnership $ 3,400,000 $ 9,600,000 $ 38,200,000  
Deferred income tax expense (622,000) (5,911,000) (30,372,000)  
Tax Cuts and Jobs Act of 2017 - Tax benefit from remeasurement     2,100,000  
Unused tax credit carryforward 30,500,000 26,900,000    
Valuation allowance 0 0    
Income before income taxes and net operating loss carryforward $ 12,200,000      
Percent of domestic and state operating loss carryforwards utilized 9.20%      
Unrecognized tax benefits $ 977,000 1,227,000 1,047,000 $ 0
Total unrecognized tax benefit that, if recognized, would impact the effective tax rate 767,000      
Accrued penalties and interest 0 0    
Alternative Energy Partnership        
Operating Loss Carryforwards [Line Items]        
Deferred income tax expense 362,000 1,000,000.0 6,700,000  
Affordable Housing Partnerships        
Operating Loss Carryforwards [Line Items]        
Gross investment in limited partnership 49,300,000      
Unfunded amount in limited partnership 22,400,000      
Balance of investment 36,500,000 20,000,000.0    
Tax deductions 6,200,000      
Tax credits 400,000      
Investment amortization 3,500,000 2,000,000.0 $ 1,400,000  
Investment Tax Credit Carryforward | Affordable Housing Partnerships        
Operating Loss Carryforwards [Line Items]        
Unused tax credit carryforward 3,100,000 $ 2,700,000    
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 1,800,000      
Operating loss carryforward utilized 474,000      
Domestic Tax Authority | Low Income Housing Tax Credit        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward utilized 1,900,000      
State and Local Jurisdiction        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 8,600,000      
State and Local Jurisdiction | Research Tax Credit Carryforward        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward utilized 350,000      
State and Local Jurisdiction | State Film Tax Credit        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward utilized 369,000      
State and Local Jurisdiction | Low Income Housing Tax Credit        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward utilized 151,000      
Gateway Bancorp        
Operating Loss Carryforwards [Line Items]        
Section 382 limitation $ 474,000