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FAIR VALUE DISCLOSURES - Summary of Financial Assets and Liabilities Measure at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Assets          
Investment securities available-for-sale $ 3,044,361   $ 3,044,361   $ 3,409,648
Loans Held-for-sale, Fair Value Disclosure 12,400   12,400   7,900
Derivative Asset 368,976   368,976   357,698
Liabilities          
Derivative liabilities 370,576   370,576   357,698
Fair Value, Option, Changes in Fair Value, Gain (Loss) (100) $ (200) 600 $ (1,400)  
Financing Receivable, Held-for-Sale 11,400   11,400   7,500
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables 1,000   1,000   400
Fair Value, Measurements, Recurring          
Assets          
Investment securities available-for-sale 3,044,361   3,044,361   3,409,648
Derivative Asset         152,846
Total 3,425,736   3,425,736   3,775,294
Liabilities          
Total 370,592   370,592   358,001
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 | Fair value          
Assets          
Loans Held-for-sale, Fair Value Disclosure 0   0   0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1          
Assets          
Investment securities available-for-sale 32,141   32,141   32,696
Derivative Asset         0
Total 32,141   32,141   32,696
Liabilities          
Total 0   0   0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 | Fair value          
Assets          
Loans Held-for-sale, Fair Value Disclosure 12,391   12,391   7,918
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2          
Assets          
Investment securities available-for-sale 2,979,075   2,979,075   3,341,095
Derivative Asset         152,846
Total 3,360,450   3,360,450   3,706,741
Liabilities          
Total 370,592   370,592   358,001
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 | Fair value          
Assets          
Loans Held-for-sale, Fair Value Disclosure 0   0   0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3          
Assets          
Investment securities available-for-sale 33,145   33,145   35,857
Derivative Asset         0
Total 33,145   33,145   35,857
Liabilities          
Total 0   0   0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3          
Assets          
Loans Held-for-sale, Fair Value Disclosure 12,391   12,391   7,918
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring          
Assets          
Derivative Asset 173,470   173,470    
Liabilities          
Derivative liabilities 173,652   173,652   153,119
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1          
Assets          
Derivative Asset 0   0    
Liabilities          
Derivative liabilities 0   0   0
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2          
Assets          
Derivative Asset 173,470   173,470    
Liabilities          
Derivative liabilities 173,652   173,652   153,119
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3          
Assets          
Derivative Asset 0   0    
Liabilities          
Derivative liabilities 0   0   0
Foreign Exchange | Fair Value, Measurements, Recurring          
Assets          
Derivative Asset 194,956   194,956   204,882
Liabilities          
Derivative liabilities 194,956   194,956   204,882
Foreign Exchange | Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1          
Assets          
Derivative Asset 0   0   0
Liabilities          
Derivative liabilities 0   0   0
Foreign Exchange | Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2          
Assets          
Derivative Asset 194,956   194,956   204,882
Liabilities          
Derivative liabilities 194,956   194,956   204,882
Foreign Exchange | Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3          
Assets          
Derivative Asset 0   0   0
Liabilities          
Derivative liabilities 0   0   $ 0
Cash Flow Hedging | Fair Value, Measurements, Recurring          
Assets          
Derivative Asset 558   558    
Liabilities          
Derivative liabilities 1,984   1,984    
Cash Flow Hedging | Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1          
Assets          
Derivative Asset 0   0    
Liabilities          
Derivative liabilities 0   0    
Cash Flow Hedging | Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2          
Assets          
Derivative Asset 558   558    
Liabilities          
Derivative liabilities 1,984   1,984    
Cash Flow Hedging | Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3          
Assets          
Derivative Asset 0   0    
Liabilities          
Derivative liabilities $ 0   $ 0