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LOAN PORTFOLIO AND CREDIT QUALITY - Loans Text Disclosures (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 90 days past due and still accruing $ 0 $ 0
Loans pledged in agreement with Federal Home Loan Bank 2,200,000,000 2,500,000,000
Loans pledged as collateral at Federal Reserve Bank 332,800,000 395,300,000
Loans classified as TDRs 13,900,000 12,600,000
Commitment to lend 0 0
Deferred loan origination (fees)/costs, net 300,000 8,100,000
Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Proceeds from sale of finance receivables 72,000,000.0  
Gain (loss) on sale of financing receivable 427,000  
Mortgage and Commercial Servicing Rights    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Finite-lived intangible assets acquired 1,200,000  
Performing Financial Instruments    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans classified as TDRs $ 7,200,000 $ 7,100,000