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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
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Assets
Investment securities available-for-sale	$ 3,957,882		$ 4,207,846
Loans Held-for-sale, Fair Value Disclosure	12,700		29,500
Derivative Asset	219,745		212,970
Liabilities
Derivative liabilities	219,745		212,977
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(1,300)	$ (1,300)
Financing Receivable, Held-for-Sale	11,700		27,200
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables	900		2,300
Fair Value, Measurements, Recurring
Assets
Investment securities available-for-sale	3,957,882		4,207,846
Derivative Asset			92,328
Total	4,190,366		4,450,424
Liabilities
Total	219,851		213,212
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	32,724		34,776
Derivative Asset			0
Total	32,724		34,776
Liabilities
Total	0		0
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2 \| Fair value
Assets
Loans Held-for-sale, Fair Value Disclosure	12,670		29,482
Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2
Assets
Investment securities available-for-sale	3,887,697		4,134,889
Derivative Asset			92,328
Total	4,120,181		4,377,467
Liabilities
Total	219,851		213,212
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	37,461		38,181
Derivative Asset			0
Total	37,461		38,181
Liabilities
Total	0		0
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1, 2 and 3
Assets
Loans Held-for-sale, Fair Value Disclosure	12,670		29,482
Interest Rate Contract [Member] \| Fair Value, Measurements, Recurring
Assets
Derivative Asset	74,438
Liabilities
Derivative liabilities	74,475		92,444
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	74,438
Liabilities
Derivative liabilities	74,475		92,444
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 \| Fair Value, Measurements, Recurring
Assets
Derivative Asset	145,376		120,768
Liabilities
Derivative liabilities	145,376		120,768
Foreign Exchange \| Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 1
Assets
Derivative Asset	0		0
Liabilities
Derivative liabilities	0		0
Foreign Exchange \| Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 2
Assets
Derivative Asset	145,376		120,768
Liabilities
Derivative liabilities	145,376		120,768
Foreign Exchange \| Fair Value, Measurements, Recurring \| Fair Value Measurements Using Level 3
Assets
Derivative Asset	0		0
Liabilities
Derivative liabilities	$ 0		$ 0