FAIR VALUE MEASUREMENTS (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
ASSETS
Securities available for sale, at fair value	$ 2,252,365	$ 2,741,816
Loans held for sale	14,213	3,936
Financial Derivatives	73,730	80,310
LIABILITIES
Financial Derivatives	197,533	236,000
Quoted Prices in Active Markets for Identical Assets Level 1
ASSETS
Securities available for sale, at fair value	57,906	56,606
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	2,194,459	2,685,210
Loans held for sale	14,213	3,936
Financial Derivatives	73,730	80,310
LIABILITIES
Financial Derivatives	197,533	236,000
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	7,126	3,936
Financial Derivatives	73,730	80,310
LIABILITIES
Financial Derivatives	197,533	236,000
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	7,126	3,936
Financial Derivatives	73,730	80,310
LIABILITIES
Financial Derivatives	197,533	236,000
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	62,574	61,943
U.S. government and agency securities \| Recurring
ASSETS
Securities available for sale, at fair value	62,574	61,943
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	57,906	56,606
U.S. government and agency securities \| Recurring \| Significant Other Observable Inputs Level 2
ASSETS
Securities available for sale, at fair value	4,668	5,337
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	523,097	807,435
Obligations of states and political subdivisions \| Recurring
ASSETS
Securities available for sale, at fair value	523,097	807,435
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	523,097	807,435
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	152,006	226,380
Corporate and other bonds \| Recurring
ASSETS
Securities available for sale, at fair value	152,006	226,380
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	152,006	226,380
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	1,513,007	1,644,394
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	1,513,007	1,644,394
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	1,681	1,664
Other securities \| Recurring
ASSETS
Securities available for sale, at fair value	1,681	1,664
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	1,681	1,664
Other securities \| Recurring \| Significant Unobservable Inputs Level 3
ASSETS
Securities available for sale, at fair value	$ 0	$ 0

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