FAIR VALUE MEASUREMENTS (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
ASSETS
Securities available for sale, at fair value	$ 2,202,216	$ 2,231,261
Loans held for sale	12,200	6,710
Financial Derivatives	99,259	93,027
LIABILITIES
Financial Derivatives	226,777	206,561
Quoted Prices in Active Markets for Identical Assets Level 1
ASSETS
Securities available for sale, at fair value	60,868	61,311
Loans held for sale	0	0
Financial Derivatives	0	0
LIABILITIES
Financial Derivatives	0	0
Significant Other Observable Inputs Level 2
ASSETS
Securities available for sale, at fair value	2,141,348	2,169,950
Loans held for sale	12,200	6,710
Financial Derivatives	99,259	93,027
LIABILITIES
Financial Derivatives	226,777	206,561
Significant Unobservable Inputs Level 3
ASSETS
Securities available for sale, at fair value	0	0
Loans held for sale	0	0
Financial Derivatives	0	0
LIABILITIES
Financial Derivatives	0	0
Recurring
ASSETS
Loans held for sale	12,200	6,710
Financial Derivatives	99,259	93,027
LIABILITIES
Financial Derivatives	226,777	206,561
Recurring | Quoted Prices in Active Markets for Identical Assets Level 1
ASSETS
Loans held for sale	0	0
Financial Derivatives	0	0
LIABILITIES
Financial Derivatives	0	0
Recurring | Significant Other Observable Inputs Level 2
ASSETS
Loans held for sale	12,200	6,710
Financial Derivatives	99,259	93,027
LIABILITIES
Financial Derivatives	226,777	206,561
Recurring | Significant Unobservable Inputs Level 3
ASSETS
Loans held for sale	0	0
Financial Derivatives	0	0
LIABILITIES
Financial Derivatives	0	0
U.S. government and agency securities
ASSETS
Securities available for sale, at fair value	62,736	63,356
U.S. government and agency securities | Recurring
ASSETS
Securities available for sale, at fair value	62,736	63,356
U.S. government and agency securities | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1
ASSETS
Securities available for sale, at fair value	60,868	61,311
U.S. government and agency securities | Recurring | Significant Other Observable Inputs Level 2
ASSETS
Securities available for sale, at fair value	1,868	2,045
U.S. government and agency securities | Recurring | Significant Unobservable Inputs Level 3
ASSETS
Securities available for sale, at fair value	0	0
Obligations of states and political subdivisions
ASSETS
Securities available for sale, at fair value	461,850	475,447
Obligations of states and political subdivisions | Recurring
ASSETS
Securities available for sale, at fair value	461,850	475,447
Obligations of states and political subdivisions | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1
ASSETS
Securities available for sale, at fair value	0	0
Obligations of states and political subdivisions | Recurring | Significant Other Observable Inputs Level 2
ASSETS
Securities available for sale, at fair value	461,850	475,447
Obligations of states and political subdivisions | Recurring | Significant Unobservable Inputs Level 3
ASSETS
Securities available for sale, at fair value	0	0
Corporate and other bonds
ASSETS
Securities available for sale, at fair value	250,264	241,889
Corporate and other bonds | Recurring
ASSETS
Securities available for sale, at fair value	250,264	241,889
Corporate and other bonds | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1
ASSETS
Securities available for sale, at fair value	0	0
Corporate and other bonds | Recurring | Significant Other Observable Inputs Level 2
ASSETS
Securities available for sale, at fair value	250,264	241,889
Corporate and other bonds | Recurring | Significant Unobservable Inputs Level 3
ASSETS
Securities available for sale, at fair value	0	0
Mortgage-backed securities | Recurring
ASSETS
Securities available for sale, at fair value	1,425,587	1,448,817
Mortgage-backed securities | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1
ASSETS
Securities available for sale, at fair value	0	0
Mortgage-backed securities | Recurring | Significant Other Observable Inputs Level 2
ASSETS
Securities available for sale, at fair value	1,425,587	1,448,817
Mortgage-backed securities | Recurring | Significant Unobservable Inputs Level 3
ASSETS
Securities available for sale, at fair value	0	0
Other securities
ASSETS
Securities available for sale, at fair value	1,779	1,752
Other securities | Recurring
ASSETS
Securities available for sale, at fair value	1,779	1,752
Other securities | Recurring | Quoted Prices in Active Markets for Identical Assets Level 1
ASSETS
Securities available for sale, at fair value	0	0
Other securities | Recurring | Significant Other Observable Inputs Level 2
ASSETS
Securities available for sale, at fair value	1,779	1,752
Other securities | Recurring | Significant Unobservable Inputs Level 3
ASSETS
Securities available for sale, at fair value	$ 0	$ 0