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INCOME TAXES - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]        
Tax Cuts and Jobs Act of 2017 - Tax benefit from remeasurement $ 2,100,000      
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount 2,200,000      
Tax credits on investments in alternative energy partnership 38,200,000 $ 33,400,000    
Deferred income tax expense (30,372,000) 5,613,000 $ 7,279,000  
Valuation allowance 0 0    
Income before income taxes and net operating loss carryforward $ 46,200,000      
Percent of domestic and state operating loss carryforwards utilized 16.90%      
Threshold amount on use of operating loss carryforwards in year 2 $ 1,400,000      
Threshold amount on use of operating loss carryforwards in year 3 and thereafter 474,000      
Unrecognized tax benefits 1,047,000 0 0 $ 5,421,000
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 15,600,000      
Balance of investment 22,000,000 23,200,000    
Tax deductions 1,700,000      
Tax credits 849,000      
Investment amortization 1,400,000 394,000 $ 727,000  
Beach Business Bank        
Operating Loss Carryforwards [Line Items]        
Section 382 limitation 1,300,000      
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 849,000 0    
Research Tax Credit Carryforward        
Operating Loss Carryforwards [Line Items]        
Unused tax credit carryforward 320,000 0    
Tax credit carryforward utilized 500,000      
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 2,700,000      
Operating loss carryforward utilized 474,000      
State and Local Jurisdiction        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 10,500,000      
Operating loss carryforward utilized 1,800,000      
Alternative Energy Partnership        
Operating Loss Carryforwards [Line Items]        
Deferred income tax expense 6,700,000 5,800,000    
Alternative Energy Partnership | Investment Tax Credit Carryforward        
Operating Loss Carryforwards [Line Items]        
Unused tax credit carryforward 26,200,000 $ 0    
Tax credit carryforward utilized $ 12,000,000