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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period   $ 81,030   $ 81,030  
(Reversal of) provision for credit losses $ (2,154) (1,107) $ 11,826 (3,261) $ 27,587
Balance at end of period 75,885     75,885  
Loans          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 82,713 84,213 82,131 84,213 61,713
Loans charged off (886)   0 (1,451) (2,076)
Recoveries of loans previously charged off 26   608 198 958
Net (charge-offs) recoveries (860)   608 (1,253) (1,118)
(Reversal of) provision for credit losses (2,154)   11,826 (3,261) 27,587
Balance at end of period 79,699 82,713 94,565 79,699 94,565
Impact of adopting ASU 2016-13 | Loans          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period   0   0 6,383
Allowance for Loan Losses          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 79,353 81,030 78,243 81,030 57,649
Loans charged off (886)   0 (1,451) (2,076)
Recoveries of loans previously charged off 26   608 198 958
Net (charge-offs) recoveries (860)   608 (1,253) (1,118)
(Reversal of) provision for credit losses (2,608)   11,519 (3,892) 26,230
Balance at end of period 75,885 79,353 90,370 75,885 90,370
Allowance for Loan Losses | Loans          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 79,353 81,030 78,243 81,030 57,649
Loans charged off (886)   0 (1,451) (2,076)
Recoveries of loans previously charged off 26   608 198 958
Net (charge-offs) recoveries (860)   608 (1,253) (1,118)
(Reversal of) provision for credit losses (2,608)   11,519 (3,892) 26,230
Balance at end of period 75,885 79,353 90,370 75,885 90,370
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   0 7,609
Reserve for Unfunded Loan Commitments | Loans          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Balance at beginning of period 3,360 3,183 3,888 3,183 4,064
Loans charged off 0   0 0 0
Recoveries of loans previously charged off 0   0 0 0
Net (charge-offs) recoveries 0   0 0 0
(Reversal of) provision for credit losses 454   307 631 1,357
Balance at end of period $ 3,814 3,360 $ 4,195 3,814 4,195
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   $ 0 $ (1,226)