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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Changes in Allowance for Loan Losses by Loan Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance for loan losses:      
Beginning balance $ 223,277   $ 130,648
Provision for credit losses 7,300 $ 0 0
CECL Day 1 non-PCD provision for credit losses   13,955  
CECL Day 1 PCD ACL   16,599  
Recoveries on loans 2,396 3,927 2,578
Loans charged off (28,039) (6,601) (11,884)
Ending balance 204,934 223,277  
Impact of adopting ASC 326      
Allowance for loan losses:      
Beginning balance     74,055
Balance, January 1, 2021      
Allowance for loan losses:      
Beginning balance     204,703
Previously Reported      
Allowance for loan losses:      
Beginning balance 223,277 195,397 130,648
Ending balance   223,277 195,397
Credit risk reclassifications      
Allowance for loan losses:      
Beginning balance     0
Commercial      
Allowance for loan losses:      
Beginning balance     47,115
Provision for credit losses 17,401 16,697 7,921
CECL Day 1 non-PCD provision for credit losses   2,957  
CECL Day 1 PCD ACL   12,970  
Recoveries on loans 995 872 724
Loans charged off (23,264) (1,215) (5,849)
Ending balance 97,348    
Commercial | Impact of adopting ASC 326      
Allowance for loan losses:      
Beginning balance     20,024
Commercial | Balance, January 1, 2021      
Allowance for loan losses:      
Beginning balance     67,139
Commercial | Previously Reported      
Allowance for loan losses:      
Beginning balance 102,216 69,935 47,115
Ending balance   102,216 69,935
Commercial | Credit risk reclassifications      
Allowance for loan losses:      
Beginning balance    
Commercial Real Estate      
Allowance for loan losses:      
Beginning balance     40,786
Provision for credit losses (2,735) (20,425) (11,093)
CECL Day 1 non-PCD provision for credit losses   5,539  
CECL Day 1 PCD ACL   2,981  
Recoveries on loans 60 1,096 580
Loans charged off (116) (3,017) (4,533)
Ending balance 44,048    
Commercial Real Estate | Impact of adopting ASC 326      
Allowance for loan losses:      
Beginning balance     34,925
Commercial Real Estate | Balance, January 1, 2021      
Allowance for loan losses:      
Beginning balance     75,711
Commercial Real Estate | Previously Reported      
Allowance for loan losses:      
Beginning balance 46,839 60,665 51,070
Ending balance   46,839 60,665
Commercial Real Estate | Credit risk reclassifications      
Allowance for loan losses:      
Beginning balance     (10,284)
Construction      
Allowance for loan losses:      
Beginning balance     10,284
Provision for credit losses (4,132) 6,367 1,122
CECL Day 1 non-PCD provision for credit losses   871  
CECL Day 1 PCD ACL   648  
Recoveries on loans 0 863 1
Loans charged off 0 0 (6)
Ending balance 24,823    
Construction | Impact of adopting ASC 326      
Allowance for loan losses:      
Beginning balance     8,805
Construction | Balance, January 1, 2021      
Allowance for loan losses:      
Beginning balance     19,089
Construction | Previously Reported      
Allowance for loan losses:      
Beginning balance 28,955 20,206 0
Ending balance   28,955 20,206
Construction | Credit risk reclassifications      
Allowance for loan losses:      
Beginning balance     10,284
Consumer      
Allowance for loan losses:      
Beginning balance     0
Provision for credit losses     0
Recoveries on loans     0
Loans charged off     0
Consumer | Impact of adopting ASC 326      
Allowance for loan losses:      
Beginning balance     0
Consumer | Balance, January 1, 2021      
Allowance for loan losses:      
Beginning balance     0
Consumer | Previously Reported      
Allowance for loan losses:      
Beginning balance   0 9,648
Ending balance     0
Consumer | Credit risk reclassifications      
Allowance for loan losses:      
Beginning balance     (9,648)
Residential      
Allowance for loan losses:      
Beginning balance     0
Provision for credit losses     0
Recoveries on loans     0
Loans charged off     0
Residential | Impact of adopting ASC 326      
Allowance for loan losses:      
Beginning balance     0
Residential | Balance, January 1, 2021      
Allowance for loan losses:      
Beginning balance     0
Residential | Previously Reported      
Allowance for loan losses:      
Beginning balance   0 22,815
Ending balance     0
Residential | Credit risk reclassifications      
Allowance for loan losses:      
Beginning balance     (22,815)
Consumer & Residential      
Allowance for loan losses:      
Beginning balance     32,463
Provision for credit losses (3,234) (2,639) 2,050
CECL Day 1 non-PCD provision for credit losses   4,588  
CECL Day 1 PCD ACL   0  
Recoveries on loans 1,341 1,096 1,273
Loans charged off (4,659) (2,369) (1,496)
Ending balance 38,715    
Consumer & Residential | Impact of adopting ASC 326      
Allowance for loan losses:      
Beginning balance     10,301
Consumer & Residential | Balance, January 1, 2021      
Allowance for loan losses:      
Beginning balance     42,764
Consumer & Residential | Previously Reported      
Allowance for loan losses:      
Beginning balance $ 45,267 44,591 0
Ending balance   $ 45,267 44,591
Consumer & Residential | Credit risk reclassifications      
Allowance for loan losses:      
Beginning balance     $ 32,463