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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgage Loans Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 7,251,480 $ 5,898,405
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 7,251,480  
Loans And Finance Receivables, Non-Traditional Mortgages | Loan Portfolio | Loan Portfolio Concentration Risk    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage to total loans and leases (percent) 8.80% 7.40%
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 635,300 $ 437,100
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 4,000 8,700
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | First Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 633,700  
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | First Mortgage | Debt-to-Value Ratio, Less than 80 Percent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 631,500  
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | Interest Only    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 613,300 401,600
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | Interest Only | Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loan term (in years) 30 years  
Mortgage loan, flexible initial term (in years) 1 year  
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | Interest Only | Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage loan term (in years) 40 years  
Mortgage loan, flexible initial term (in years) 10 years  
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | Green    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 21,500 33,200
Interest only notes balloon payment period 15 years  
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | Negative Amortization    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 500 $ 2,300
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio | Loan Portfolio Concentration Risk | Green | First Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 19,900