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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period       $ 81,030  
(Reversal of) provision for credit losses $ (1,147) $ (2,154) $ 1,141 (4,408) $ 28,728
Balance at end of period 73,524     73,524  
Loans          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 79,699   94,565 84,213 61,713
Loans charged off (327)   (1,821) (1,778) (3,897)
Recoveries of loans previously charged off 532   248 730 1,206
Net recoveries (charge-offs) 205   (1,573) (1,048) (2,691)
(Reversal of) provision for credit losses (1,147)   1,141 (4,408) 28,728
Balance at end of period 78,757 79,699 94,133 78,757 94,133
Impact of adopting ASU 2016-13 | Loans          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period       0 6,383
Allowance for Loan Losses          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 75,885   90,370 81,030 57,649
Loans charged off (327)   (1,821) (1,778) (3,897)
Recoveries of loans previously charged off 532   248 730 1,206
Net recoveries (charge-offs) 205   (1,573) (1,048) (2,691)
(Reversal of) provision for credit losses (2,566)   2,130 (6,458) 28,360
Balance at end of period 73,524 75,885 90,927 73,524 90,927
Allowance for Loan Losses | Loans          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 75,885   90,370 81,030 57,649
Loans charged off (327)   (1,821) (1,778) (3,897)
Recoveries of loans previously charged off 532   248 730 1,206
Net recoveries (charge-offs) 205   (1,573) (1,048) (2,691)
(Reversal of) provision for credit losses (2,566)   2,130 (6,458) 28,360
Balance at end of period 73,524 75,885 90,927 73,524 90,927
Allowance for Loan Losses | Impact of adopting ASU 2016-13          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period         7,609
Allowance for Loan Losses | Impact of adopting ASU 2016-13 | Loans          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period       0 7,609
Reserve for Unfunded Loan Commitments | Loans          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 3,814   4,195 3,183 4,064
Loans charged off 0   0 0 0
Recoveries of loans previously charged off 0   0 0 0
Net recoveries (charge-offs) 0   0 0 0
(Reversal of) provision for credit losses 1,419   (989) 2,050 368
Balance at end of period $ 5,233 $ 3,814 $ 3,206 5,233 3,206
Reserve for Unfunded Loan Commitments | Impact of adopting ASU 2016-13 | Loans          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period       $ 0 $ (1,226)