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INCOME TAXES - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]        
Tax Cuts and Jobs Act of 2017 - Tax benefit from remeasurement $ 2,100,000      
Tax credits on investments in alternative energy partnership 9,600,000 $ 38,200,000 $ 33,400,000  
Deferred income tax expense (5,911,000) (30,372,000) 5,613,000  
Pre-tax book income   34,100,000 149,400,000  
Unused tax credit carryforward 26,900,000 27,400,000    
Valuation allowance 0 0    
Income before income taxes and net operating loss carryforward $ 64,500,000      
Percent of domestic and state operating loss carryforwards utilized 16.80%      
Unrecognized tax benefits $ 1,227,000 1,047,000 0 $ 0
Total unrecognized tax benefit that, if recognized, would impact the effective tax rate 1,000,000      
Accrued penalties and interest 0 0    
Affordable Housing Partnerships        
Operating Loss Carryforwards [Line Items]        
Gross investment in limited partnership 29,300,000      
Unfunded amount in limited partnership 11,500,000      
Balance of investment 20,000,000 22,000,000    
Tax deductions 1,900,000      
Tax credits 1,800,000      
Investment amortization 2,000,000 1,400,000 394,000  
Gateway Bancorp        
Operating Loss Carryforwards [Line Items]        
Section 382 limitation 474,000      
Investment Tax Credit Carryforward | Affordable Housing Partnerships        
Operating Loss Carryforwards [Line Items]        
Unused tax credit carryforward 2,700,000 849,000    
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 2,200,000      
Operating loss carryforward utilized 474,000      
Domestic Tax Authority | Research Tax Credit Carryforward        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward utilized 400,000      
State and Local Jurisdiction        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 9,100,000      
Operating loss carryforward utilized 1,400,000      
State and Local Jurisdiction | Research Tax Credit Carryforward        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward utilized 500,000      
Alternative Energy Partnership        
Operating Loss Carryforwards [Line Items]        
Deferred income tax expense 1,000,000 $ 6,700,000 $ 5,800,000  
Alternative Energy Partnership | Investment Tax Credit Carryforward        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward utilized 9,600,000      
ASU 2018-02 | Accumulated Other Comprehensive Income (Loss)        
Operating Loss Carryforwards [Line Items]        
Reclassification of stranded tax effects to retained earnings 496,000      
ASU 2018-02 | Retained Earnings        
Operating Loss Carryforwards [Line Items]        
Reclassification of stranded tax effects to retained earnings $ (496,000)