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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 81,030    
(Reversal of) provision for credit losses (1,107) $ 991 $ 15,761
Balance at end of period 79,353 81,030  
Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 84,213   61,713
Charge-offs (565)   (2,076)
Recoveries 172   350
Net (charge-offs) recoveries (393)   (1,726)
(Reversal of) provision for credit losses (1,107)   15,761
Balance at end of period 82,713 84,213 82,131
Impact of adopting ASU 2016-13 | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 0   6,383
Balance at end of period   0  
Allowance for Loan Losses      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 81,030   57,649
Charge-offs (565)   (2,076)
Recoveries 172   350
Net (charge-offs) recoveries (393)   (1,726)
(Reversal of) provision for credit losses (1,284)   14,711
Balance at end of period 79,353 81,030 78,243
Allowance for Loan Losses | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 81,030   57,649
Charge-offs (565)   (2,076)
Recoveries 172   350
Net (charge-offs) recoveries (393)   (1,726)
(Reversal of) provision for credit losses (1,284)   14,711
Balance at end of period 79,353 81,030 78,243
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
Balance at end of period   0  
Reserve for Unfunded Loan Commitments | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 3,183   4,064
Charge-offs 0   0
Recoveries 0   0
Net (charge-offs) recoveries 0   0
(Reversal of) provision for credit losses 177   1,050
Balance at end of period 3,360 3,183 3,888
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)
Balance at end of period   $ 0