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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgage Loans Additional Information (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 7,451,264 $ 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) 11.30% 8.80%
NTM Loans | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 841,100 $ 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) 60.00%  
NTM Loans | Consumer | Interest Only    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 833,600 613,300
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 $ 7,400 $ 21,900
Interest only notes balloon payment period 15 years