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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	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Assets
Investment securities available-for-sale	$ 3,955,839
Loans Held-for-sale, Fair Value Disclosure	31,500		$ 41,100
Derivative Asset	237,958		272,499
Liabilities
Derivative liabilities	238,050		272,606
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(700)	$ 6,100
Financing Receivable, Held-for-Sale	28,000		35,500
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables	3,500		5,600
Fair Value, Measurements, Recurring
Assets
Investment securities available-for-sale	3,955,839		3,424,580
Derivative Asset			185,032
Total	4,225,427		3,738,330
Liabilities
Total	238,362		273,739
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1 \| Fair value
Assets
Loans Held-for-sale, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1
Assets
Investment securities available-for-sale	20,438		103
Derivative Asset			0
Total	20,438		103
Liabilities
Total	0		0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| Fair value
Assets
Loans Held-for-sale, Fair Value Disclosure	31,546		41,103
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2
Assets
Investment securities available-for-sale	3,896,371		3,383,902
Derivative Asset			185,032
Total	4,165,959		3,697,652
Liabilities
Total	238,362		273,739
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3 \| Fair value
Assets
Loans Held-for-sale, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3
Assets
Investment securities available-for-sale	39,030		40,575
Derivative Asset			0
Total	39,030		40,575
Liabilities
Total	0		0
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1, 2 and 3
Assets
Loans Held-for-sale, Fair Value Disclosure	31,546		41,103
Interest Rate Contract [Member] \| Fair Value, Measurements, Recurring
Assets
Derivative Asset	125,505
Liabilities
Derivative liabilities	125,825		186,124
Interest Rate Contract [Member] \| Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1
Assets
Derivative Asset	0
Liabilities
Derivative liabilities	0		0
Interest Rate Contract [Member] \| Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2
Assets
Derivative Asset	125,505
Liabilities
Derivative liabilities	125,825		186,124
Interest Rate Contract [Member] \| Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3
Assets
Derivative Asset	0
Liabilities
Derivative liabilities	0		0
Foreign Exchange [Member] \| Fair Value, Measurements, Recurring
Assets
Derivative Asset	112,537		87,615
Liabilities
Derivative liabilities	112,537		87,615
Foreign Exchange [Member] \| Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1
Assets
Derivative Asset	0		0
Liabilities
Derivative liabilities	0		0
Foreign Exchange [Member] \| Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2
Assets
Derivative Asset	112,537		87,615
Liabilities
Derivative liabilities	112,537		87,615
Foreign Exchange [Member] \| Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3
Assets
Derivative Asset	0		0
Liabilities
Derivative liabilities	$ 0		$ 0