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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Assets          
Investment securities available-for-sale $ 3,249,404   $ 3,249,404   $ 3,409,648
Loans Held-for-sale, Fair Value Disclosure 15,300   15,300   7,900
Derivative Asset 304,416   304,416   357,698
Liabilities          
Derivative liabilities 304,302   304,302   357,698
Fair Value, Option, Changes in Fair Value, Gain (Loss) 100 $ 100 700 $ (1,200)  
Financing Receivable, Held-for-Sale 14,200   14,200   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 3,249,404   3,249,404   3,409,648
Derivative Asset         152,846
Total 3,569,107   3,569,107   3,775,294
Liabilities          
Total 304,350   304,350   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 32,847   32,847   32,696
Derivative Asset         0
Total 32,847   32,847   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 15,267   15,267   7,918
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2          
Assets          
Investment securities available-for-sale 3,182,425   3,182,425   3,341,095
Derivative Asset         152,846
Total 3,502,128   3,502,128   3,706,741
Liabilities          
Total 304,350   304,350   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 34,132   34,132   35,857
Derivative Asset         0
Total 34,132   34,132   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 15,267   15,267   7,918
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring          
Assets          
Derivative Asset 152,126   152,126    
Liabilities          
Derivative liabilities 152,154   152,154   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 152,126   152,126    
Liabilities          
Derivative liabilities 152,154   152,154   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 151,844   151,844   204,882
Liabilities          
Derivative liabilities 151,844   151,844   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 151,844   151,844   204,882
Liabilities          
Derivative liabilities 151,844   151,844   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 466   466    
Liabilities          
Derivative liabilities 352   352    
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 466   466    
Liabilities          
Derivative liabilities 352   352    
Cash Flow Hedging | Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3          
Assets          
Derivative Asset 0   0    
Liabilities          
Derivative liabilities $ 0   $ 0