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INCOME TAXES - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]        
Income tax credits recognized   $ 3,400,000 $ 9,600,000  
Deferred income tax expense $ (9,259,000) (622,000) (5,911,000)  
Unused tax credit carryforward 30,200,000 30,700,000    
Valuation allowance 0 0    
Income before income taxes and net operating loss carryforward $ 32,000,000.0      
Percent of domestic and state operating loss carryforwards utilized 5.90%      
Unrecognized tax benefits $ 924,000 977,000 1,227,000 $ 1,047,000
Total unrecognized tax benefit that, if recognized, would impact the effective tax rate 701,000      
Accrued penalties and interest 0 0    
Alternative Energy Partnership        
Operating Loss Carryforwards [Line Items]        
Deferred income tax expense   362,000 1,000,000.0  
Affordable Housing Partnerships        
Operating Loss Carryforwards [Line Items]        
Gross investment in limited partnership 61,300,000      
Unfunded amount in limited partnership 18,300,000      
Balance of investment 43,200,000 36,500,000    
Tax deductions 7,200,000 7,800,000    
Proportional amortization recognized 5,300,000 3,500,000 $ 2,000,000.0  
Investment Tax Credit Carryforward        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward utilized 4,700,000      
Investment Tax Credit Carryforward | Affordable Housing Partnerships        
Operating Loss Carryforwards [Line Items]        
Unused tax credit carryforward 9,000,000.0 $ 3,100,000    
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 2,800,000      
Operating loss carryforward utilized 474,000      
Domestic Tax Authority | Research Tax Credit Carryforward        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward utilized 250,000      
State and Local Jurisdiction        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 5,200,000      
State and Local Jurisdiction | Research Tax Credit Carryforward        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward utilized 350,000      
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