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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year $ 81,030    
Provision for (reversal of) credit losses 6,854 $ 29,719 $ 35,829
Balance at end of year 92,584 81,030  
Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 84,213 61,713 66,814
Initial allowance for credit losses purchased in acquisition 13,650 0 0
Charge-offs (9,886) (15,417) (41,766)
Recoveries 3,358 1,815 836
Net (charge-offs) recoveries (6,528) (13,602) (40,930)
Provision for (reversal of) credit losses 6,854 29,719 35,829
Balance at end of year 98,189 84,213 61,713
Commercial real estate | Impact of ASC 326 Adoption      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 0 6,383 0
Balance at end of year   0 6,383
Allowance for Loan Losses      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 81,030 57,649  
Initial allowance for credit losses purchased in acquisition 13,650    
Charge-offs (9,886) (15,417)  
Recoveries 3,358 1,815  
Net (charge-offs) recoveries (6,528) (13,602)  
Provision for (reversal of) credit losses 4,432 29,374  
Balance at end of year 92,584 81,030 57,649
Allowance for Loan Losses | Impact of ASC 326 Adoption      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year   7,609  
Balance at end of year     7,609
Allowance for Loan Losses | Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 81,030 57,649 62,192
Initial allowance for credit losses purchased in acquisition 13,650 0 0
Charge-offs (9,886) (15,417) (41,766)
Recoveries 3,358 1,815 836
Net (charge-offs) recoveries (6,528) (13,602) (40,930)
Provision for (reversal of) credit losses 4,432 29,374 36,387
Balance at end of year 92,584 81,030 57,649
Allowance for Loan Losses | Commercial real estate | Impact of ASC 326 Adoption      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 0 7,609 0
Balance at end of year   0 7,609
Allowance for Loan Losses | Commercial | Commercial and industrial      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 20,608 22,353  
Initial allowance for credit losses purchased in acquisition 11,933    
Charge-offs (6,209) (13,588)  
Recoveries 3,150 604  
Net (charge-offs) recoveries (3,059) (12,984)  
Provision for (reversal of) credit losses 4,075 10,577  
Balance at end of year 33,557 20,608 22,353
Allowance for Loan Losses | Commercial | Commercial and industrial | Impact of ASC 326 Adoption      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year   662  
Balance at end of year     662
Allowance for Loan Losses | Commercial | Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 19,074 5,941  
Initial allowance for credit losses purchased in acquisition 614    
Charge-offs (576) 0  
Recoveries 0 0  
Net (charge-offs) recoveries (576) 0  
Provision for (reversal of) credit losses 2,615 8,286  
Balance at end of year 21,727 19,074 5,941
Allowance for Loan Losses | Commercial | Commercial real estate | Impact of ASC 326 Adoption      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year   4,847  
Balance at end of year     4,847
Allowance for Loan Losses | Commercial | Multifamily      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 22,512 11,405  
Initial allowance for credit losses purchased in acquisition 469    
Charge-offs 0 0  
Recoveries 0 0  
Net (charge-offs) recoveries 0 0  
Provision for (reversal of) credit losses (5,088) 9,298  
Balance at end of year 17,893 22,512 11,405
Allowance for Loan Losses | Commercial | Multifamily | Impact of ASC 326 Adoption      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year   1,809  
Balance at end of year     1,809
Allowance for Loan Losses | Commercial | SBA      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 3,145 3,120  
Initial allowance for credit losses purchased in acquisition 575    
Charge-offs (2,780) (1,083)  
Recoveries 132 328  
Net (charge-offs) recoveries (2,648) (755)  
Provision for (reversal of) credit losses 1,945 392  
Balance at end of year 3,017 3,145 3,120
Allowance for Loan Losses | Commercial | SBA | Impact of ASC 326 Adoption      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year   388  
Balance at end of year     388
Allowance for Loan Losses | Commercial | Construction      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 5,849 3,906  
Initial allowance for credit losses purchased in acquisition 28    
Charge-offs 0 0  
Recoveries 0 0  
Net (charge-offs) recoveries 0 0  
Provision for (reversal of) credit losses (255) 1,840  
Balance at end of year 5,622 5,849 3,906
Allowance for Loan Losses | Commercial | Construction | Impact of ASC 326 Adoption      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year   103  
Balance at end of year     103
Allowance for Loan Losses | Consumer | Single Family Residential Mortgage      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 9,191 10,486  
Initial allowance for credit losses purchased in acquisition 0    
Charge-offs (321) (742)  
Recoveries 74 664  
Net (charge-offs) recoveries (247) (78)  
Provision for (reversal of) credit losses 664 (797)  
Balance at end of year 9,608 9,191 10,486
Allowance for Loan Losses | Consumer | Single Family Residential Mortgage | Impact of ASC 326 Adoption      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year   (420)  
Balance at end of year     (420)
Allowance for Loan Losses | Consumer | Other Consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 651 438  
Initial allowance for credit losses purchased in acquisition 31    
Charge-offs 0 (4)  
Recoveries 2 219  
Net (charge-offs) recoveries 2 215  
Provision for (reversal of) credit losses 476 (222)  
Balance at end of year 1,160 651 438
Allowance for Loan Losses | Consumer | Other Consumer | Impact of ASC 326 Adoption      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year   220  
Balance at end of year     220
Reserve for Unfunded Loan Commit-ments | Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year 3,183 4,064 4,622
Initial allowance for credit losses purchased in acquisition 0 0 0
Charge-offs 0 0 0
Recoveries 0 0 0
Net (charge-offs) recoveries 0 0 0
Provision for (reversal of) credit losses 2,422 345 (558)
Balance at end of year 5,605 3,183 4,064
Reserve for Unfunded Loan Commit-ments | Commercial real estate | Impact of ASC 326 Adoption      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of year $ 0 (1,226) 0
Balance at end of year   $ 0 $ (1,226)