FAIR VALUE (Fair value measurement recurring) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets
Securities available for sale	$ 873,218
Equity securities with a readily determinable fair value	21,586	$ 21,056
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	15,847	32,118
Derivative financial instrument	0	0
Liabilities
Derivative financial instrument	0	0
Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	4,169,207	4,614,773
Derivative financial instrument	128,849	84,904
Liabilities
Derivative financial instrument	64,905	84,249
Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Derivative financial instrument	0	0
Liabilities
Derivative financial instrument	0	0
U.S. treasuries
Assets
Securities available for sale	15,847	32,118
U.S. agencies
Assets
Securities available for sale	12,600	14,530
Obligations of states and political subdivisions
Assets
Securities available for sale	724,465	741,245
Commercial mortgage-backed securities - agency
Assets
Securities available for sale	60,501	64,788
Commercial mortgage-backed securities - non-agency
Assets
Securities available for sale	387,939	514,858
Asset-backed securities
Assets
Securities available for sale	176,382	217,370
Corporate bonds
Assets
Securities available for sale	120,306	118,169
Recurring Basis
Assets
Equity securities with a readily determinable fair value	21,586	21,056
Total assets at fair value	4,313,903	4,731,795
Liabilities
Total liabilities at fair value	64,905	84,249
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Equity securities with a readily determinable fair value	0	0
Total assets at fair value	15,847	32,118
Liabilities
Total liabilities at fair value	0	0
Recurring Basis | Significant Other Observable Inputs (Level 2)
Assets
Equity securities with a readily determinable fair value	21,586	21,056
Total assets at fair value	4,298,056	4,699,677
Liabilities
Total liabilities at fair value	64,905	84,249
Recurring Basis | Significant Unobservable Inputs (Level 3)
Assets
Equity securities with a readily determinable fair value	0	0
Total assets at fair value	0	0
Liabilities
Total liabilities at fair value	0	0
Recurring Basis | Derivative financial instruments
Assets
Derivative financial instrument	128,849	84,904
Liabilities
Derivative financial instrument	64,905	84,249
Recurring Basis | Derivative financial instruments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Derivative financial instrument	0	0
Liabilities
Derivative financial instrument	0	0
Recurring Basis | Derivative financial instruments | Significant Other Observable Inputs (Level 2)
Assets
Derivative financial instrument	128,849	84,904
Liabilities
Derivative financial instrument	64,905	84,249
Recurring Basis | Derivative financial instruments | Significant Unobservable Inputs (Level 3)
Assets
Derivative financial instrument	0	0
Liabilities
Derivative financial instrument	0	0
Recurring Basis | U.S. treasuries
Assets
Securities available for sale	15,847	32,118
Recurring Basis | U.S. treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	15,847	32,118
Recurring Basis | U.S. treasuries | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	0	0
Recurring Basis | U.S. treasuries | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | U.S. agencies
Assets
Securities available for sale	12,600	14,530
Recurring Basis | U.S. agencies | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | U.S. agencies | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	12,600	14,530
Recurring Basis | U.S. agencies | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Obligations of states and political subdivisions
Assets
Securities available for sale	724,465	741,245
Recurring Basis | Obligations of states and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Obligations of states and political subdivisions | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	724,465	741,245
Recurring Basis | Obligations of states and political subdivisions | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities - agency
Assets
Securities available for sale	1,329,288	1,393,629
Recurring Basis | Mortgage-backed securities - agency | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities - agency | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	1,329,288	1,393,629
Recurring Basis | Mortgage-backed securities - agency | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities - non-agency
Assets
Securities available for sale	1,336,140	1,529,128
Recurring Basis | Mortgage-backed securities - non-agency | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Mortgage-backed securities - non-agency | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	1,336,140	1,529,128
Recurring Basis | Mortgage-backed securities - non-agency | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Commercial mortgage-backed securities - agency
Assets
Securities available for sale	60,501	64,788
Recurring Basis | Commercial mortgage-backed securities - agency | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Commercial mortgage-backed securities - agency | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	60,501	64,788
Recurring Basis | Commercial mortgage-backed securities - agency | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Commercial mortgage-backed securities - non-agency
Assets
Securities available for sale	387,939	514,858
Recurring Basis | Commercial mortgage-backed securities - non-agency | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Commercial mortgage-backed securities - non-agency | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	387,939	514,858
Recurring Basis | Commercial mortgage-backed securities - non-agency | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Asset-backed securities
Assets
Securities available for sale	176,382	217,370
Recurring Basis | Asset-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Asset-backed securities | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	176,382	217,370
Recurring Basis | Asset-backed securities | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Recurring Basis | Corporate bonds
Assets
Securities available for sale	120,306	118,169
Recurring Basis | Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Recurring Basis | Corporate bonds | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	120,306	118,169
Recurring Basis | Corporate bonds | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	$ 0	$ 0