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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgage Loans Additional Information (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 7,289,320 $ 7,251,480
NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage to total loans and leases (percent) 11.90% 8.80%
NTM Loans | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 870,000 $ 635,300
NTM Loans | Consumer | Non-performing Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 0 4,000
Weighted average LTV (percent) 59.00%  
NTM Loans | Consumer | Interest Only    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 863,200 613,300
NTM Loans | 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  
NTM Loans | 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  
NTM Loans | Consumer | Green    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 6,800 $ 21,900
Interest only notes balloon payment period 15 years