LOANS (Loans Held to Maturity) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	$ 12,068,645,000	$ 11,428,352,000
Allowance for credit losses	(122,566,000)	(109,483,000)
Additional collateral, aggregate fair value	11,946,079,000	11,318,869,000
PPP
Loans and Leases Receivable Disclosure [Line Items]
Allowance for credit losses	0
Commercial and industrial | Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	3,652,047,000	3,464,414,000
Allowance for credit losses	(40,679,000)	(29,071,000)
Commercial and industrial | PPP
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	2,777,000	11,025,000
Allowance for credit losses	0	0
Commercial and industrial | Owner occupied commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	2,638,175,000	2,265,307,000
Allowance for credit losses	(17,156,000)	(13,948,000)
Commercial and industrial | Non-owner occupied commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	2,553,711,000	2,330,940,000
Allowance for credit losses	(17,249,000)	(16,539,000)
Commercial and industrial | Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	1,011,716,000	1,076,082,000
Allowance for credit losses	(28,773,000)	(29,998,000)
Agricultural and agricultural real estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	919,184,000	920,510,000
Allowance for credit losses	(4,292,000)	(2,634,000)
Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	797,829,000	853,361,000
Allowance for credit losses	(5,845,000)	(7,711,000)
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans receivable held to maturity	493,206,000	506,713,000
Allowance for credit losses	$ (8,572,000)	$ (9,582,000)