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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses and Recorded Investment Excluding Accrued Interest in Loans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year $ 92,584    
Provision for (reversal of) credit losses (31,542) $ 6,854 $ 29,719
Balance at end of year 85,960 92,584  
Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 98,189 84,213 61,713
Initial allowance for credit losses purchased in acquisition 0 13,650 0
Charge-offs (9,278) (9,886) (15,417)
Recoveries 33,896 3,358 1,815
Net recoveries (charge-offs) 24,618 (6,528) (13,602)
Provision for (reversal of) credit losses (31,542) 6,854 29,719
Balance at end of year 91,265 98,189 84,213
Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 0 0 6,383
Balance at end of year   0 0
Allowance for Loan Losses      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 92,584 81,030  
Initial allowance for credit losses purchased in acquisition   13,650  
Charge-offs (9,278) (9,886)  
Recoveries 33,896 3,358  
Net recoveries (charge-offs) 24,618 (6,528)  
Provision for (reversal of) credit losses (31,242) 4,432  
Balance at end of year 85,960 92,584 81,030
Allowance for Loan Losses | Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 92,584 81,030 57,649
Initial allowance for credit losses purchased in acquisition 0 13,650 0
Charge-offs (9,278) (9,886) (15,417)
Recoveries 33,896 3,358 1,815
Net recoveries (charge-offs) 24,618 (6,528) (13,602)
Provision for (reversal of) credit losses (31,242) 4,432 29,374
Balance at end of year 85,960 92,584 81,030
Allowance for Loan Losses | Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 0 0 7,609
Balance at end of year   0 0
Allowance for Loan Losses | Commercial | Commercial and industrial      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 33,557 20,608  
Initial allowance for credit losses purchased in acquisition   11,933  
Charge-offs (8,597) (6,209)  
Recoveries 32,887 3,150  
Net recoveries (charge-offs) 24,290 (3,059)  
Provision for (reversal of) credit losses (23,691) 4,075  
Balance at end of year 34,156 33,557 20,608
Allowance for Loan Losses | Commercial | Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 21,727 19,074  
Initial allowance for credit losses purchased in acquisition   614  
Charge-offs 0 (576)  
Recoveries 7 0  
Net recoveries (charge-offs) 7 (576)  
Provision for (reversal of) credit losses (5,757) 2,615  
Balance at end of year 15,977 21,727 19,074
Allowance for Loan Losses | Commercial | Multifamily      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 17,893 22,512  
Initial allowance for credit losses purchased in acquisition   469  
Charge-offs 0 0  
Recoveries 0 0  
Net recoveries (charge-offs) 0 0  
Provision for (reversal of) credit losses (3,197) (5,088)  
Balance at end of year 14,696 17,893 22,512
Allowance for Loan Losses | Commercial | SBA      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 3,017 3,145  
Initial allowance for credit losses purchased in acquisition   575  
Charge-offs (428) (2,780)  
Recoveries 791 132  
Net recoveries (charge-offs) 363 (2,648)  
Provision for (reversal of) credit losses (732) 1,945  
Balance at end of year 2,648 3,017 3,145
Allowance for Loan Losses | Commercial | Construction      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 5,622 5,849  
Initial allowance for credit losses purchased in acquisition   28  
Charge-offs 0 0  
Recoveries 0 0  
Net recoveries (charge-offs) 0 0  
Provision for (reversal of) credit losses 228 (255)  
Balance at end of year 5,850 5,622 5,849
Allowance for Loan Losses | Consumer: | Single Family Residential Mortgage      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 9,608 9,191  
Initial allowance for credit losses purchased in acquisition   0  
Charge-offs (10) (321)  
Recoveries 193 74  
Net recoveries (charge-offs) 183 (247)  
Provision for (reversal of) credit losses 2,259 664  
Balance at end of year 12,050 9,608 9,191
Allowance for Loan Losses | Consumer: | Other Consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 1,160 651  
Initial allowance for credit losses purchased in acquisition   31  
Charge-offs (243) 0  
Recoveries 18 2  
Net recoveries (charge-offs) (225) 2  
Provision for (reversal of) credit losses (352) 476  
Balance at end of year 583 1,160 651
Reserve for Unfunded Non-Cancellable Loan Commit-ments | Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 5,605 3,183 4,064
Initial allowance for credit losses purchased in acquisition 0 0 0
Charge-offs 0 0 0
Recoveries 0 0 0
Net recoveries (charge-offs) 0 0 0
Provision for (reversal of) credit losses (300) 2,422 345
Balance at end of year 5,305 5,605 3,183
Reserve for Unfunded Non-Cancellable Loan Commit-ments | Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year $ 0 0 (1,226)
Balance at end of year   $ 0 $ 0