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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses and Recorded Investment Excluding Accrued Interest in Loans (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  
Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 84,213   61,713
Charge-offs (565)   (2,076)
Recoveries of loans previously charged off 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
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 of loans previously charged off 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 | Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 81,030   57,649
Charge-offs (565)   (2,076)
Recoveries of loans previously charged off 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 | Commercial | Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 20,608   22,353
Charge-offs (565)   (1,164)
Recoveries of loans previously charged off 45   30
Net (charge-offs) recoveries (520)   (1,134)
(Reversal of) provision for credit losses (385)   1,692
Balance at end of period 19,703 20,608 23,573
Allowance for Loan Losses | Commercial | Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 19,074   5,941
Charge-offs 0   0
Recoveries of loans previously charged off 0   0
Net (charge-offs) recoveries 0   0
(Reversal of) provision for credit losses (1,974)   2,832
Balance at end of period 17,100 19,074 13,620
Allowance for Loan Losses | Commercial | Multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 22,512   11,405
Charge-offs 0   0
Recoveries of loans previously charged off 0   0
Net (charge-offs) recoveries 0   0
(Reversal of) provision for credit losses 1,372   6,858
Balance at end of period 23,884 22,512 20,072
Allowance for Loan Losses | Commercial | SBA      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 3,145   3,120
Charge-offs 0   (356)
Recoveries of loans previously charged off 126   121
Net (charge-offs) recoveries 126   (235)
(Reversal of) provision for credit losses 180   379
Balance at end of period 3,451 3,145 3,652
Allowance for Loan Losses | Commercial | Construction      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 5,849   3,906
Charge-offs 0   0
Recoveries of loans previously charged off 0   0
Net (charge-offs) recoveries 0   0
(Reversal of) provision for credit losses (297)   3,043
Balance at end of period 5,552 5,849 7,052
Allowance for Loan Losses | Consumer | Single Family Residential Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 9,191   10,486
Charge-offs 0   (552)
Recoveries of loans previously charged off 0   151
Net (charge-offs) recoveries 0   (401)
(Reversal of) provision for credit losses (30)   (72)
Balance at end of period 9,161 9,191 9,593
Allowance for Loan Losses | Consumer | Other Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 651   438
Charge-offs 0   (4)
Recoveries of loans previously charged off 1   48
Net (charge-offs) recoveries 1   44
(Reversal of) provision for credit losses (150)   (21)
Balance at end of period 502 651 681
Impact of adopting ASU 2016-13 | Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 0   6,383
Balance at end of period   0  
Impact of adopting ASU 2016-13 | Allowance for Loan Losses      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period     7,609
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 0   7,609
Balance at end of period   $ 0  
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Commercial | Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period     662
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Commercial | Commercial real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period     4,847
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Commercial | Multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period     1,809
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Commercial | SBA      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period     388
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Commercial | Construction      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period     103
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Consumer | Single Family Residential Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period     (420)
Impact of adopting ASU 2016-13 | Allowance for Loan Losses | Consumer | Other Consumer      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period     $ 220