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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 92,584    
(Reversal of) provision for credit losses (31,542) $ 11,262 $ (1,107)
Balance at end of period 93,226 92,584  
Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 98,189   84,213
Loans charged off (231)   (565)
Recoveries of loans previously charged off 32,215   172
Net recoveries (charge-offs) 31,984   (393)
(Reversal of) provision for credit losses (31,542)   (1,107)
Balance at end of period 98,631 98,189 82,713
Allowance for Loan Losses      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 92,584   81,030
Loans charged off (231)   (565)
Recoveries of loans previously charged off 32,215   172
Net recoveries (charge-offs) 31,984   (393)
(Reversal of) provision for credit losses (31,342)   (1,284)
Balance at end of period 93,226 92,584 79,353
Allowance for Loan Losses | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 92,584   81,030
Loans charged off (231)   (565)
Recoveries of loans previously charged off 32,215   172
Net recoveries (charge-offs) 31,984   (393)
(Reversal of) provision for credit losses (31,342)   (1,284)
Balance at end of period 93,226 92,584 79,353
Reserve for Unfunded Loan Commitments | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 5,605   3,183
Loans charged off 0   0
Recoveries of loans previously charged off 0   0
Net recoveries (charge-offs) 0   0
(Reversal of) provision for credit losses (200)   177
Balance at end of period $ 5,405 $ 5,605 $ 3,360