FAIR VALUE (Fair value measurement recurring) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Assets
Securities available for sale	$ 980,365
Equity securities with a readily determinable fair value	20,688
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	31,679	$ 31,699
Derivative instruments	0	0
Liabilities
Fair Value	0	0
Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	5,766,362	6,115,445
Derivative instruments	96,689	46,293
Liabilities
Fair Value	51,994	46,226
Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
Derivative instruments	0	0
Liabilities
Fair Value	0	0
U.S. treasuries
Assets
Securities available for sale	31,679	31,699
U.S. agencies
Assets
Securities available for sale	43,036	43,135
Obligations of states and political subdivisions
Assets
Securities available for sale	849,239	879,437
Commercial mortgage-backed securities - agency
Assets
Securities available for sale	83,825	85,123
Commercial mortgage-backed securities - non-agency
Assets
Securities available for sale	617,992	659,459
Asset-backed securities
Assets
Securities available for sale	412,716	416,054
Corporate bonds
Assets
Securities available for sale	56,411	57,942
Recurring Basis
Assets
Equity securities with a readily determinable fair value	20,688	20,314
Total assets at fair value	5,895,079	6,193,658
Liabilities
Total liabilities at fair value	51,998	46,325
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	31,679	31,699
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	20,688	20,314
Total assets at fair value	5,863,094	6,161,785
Liabilities
Total liabilities at fair value	51,998	46,325
Recurring Basis | Significant Unobservable Inputs (Level 3)
Assets
Equity securities with a readily determinable fair value	0	0
Total assets at fair value	306	174
Liabilities
Total liabilities at fair value	0	0
Recurring Basis | Derivative financial instruments
Assets
Derivative instruments	96,689	46,293
Liabilities
Fair Value	51,994	46,226
Recurring Basis | Derivative financial instruments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Derivative instruments	0	0
Liabilities
Fair Value	0	0
Recurring Basis | Derivative financial instruments | Significant Other Observable Inputs (Level 2)
Assets
Derivative instruments	96,689	46,293
Liabilities
Fair Value	51,994	46,226
Recurring Basis | Derivative financial instruments | Significant Unobservable Inputs (Level 3)
Assets
Derivative instruments	0	0
Liabilities
Fair Value	0	0
Recurring Basis | Interest rate lock commitments
Assets
Derivative instruments	306	174
Recurring Basis | Interest rate lock commitments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Derivative instruments	0	0
Recurring Basis | Interest rate lock commitments | Significant Other Observable Inputs (Level 2)
Assets
Derivative instruments	0	0
Recurring Basis | Interest rate lock commitments | Significant Unobservable Inputs (Level 3)
Assets
Derivative instruments	306	174
Recurring Basis | Forward commitments
Assets
Derivative instruments	43	47
Liabilities
Fair Value	4	99
Recurring Basis | Forward commitments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Derivative instruments	0	0
Liabilities
Fair Value	0	0
Recurring Basis | Forward commitments | Significant Other Observable Inputs (Level 2)
Assets
Derivative instruments	43	47
Liabilities
Fair Value	4	99
Recurring Basis | Forward commitments | Significant Unobservable Inputs (Level 3)
Assets
Derivative instruments	0	0
Liabilities
Fair Value	0	0
Recurring Basis | U.S. treasuries
Assets
Securities available for sale	31,679	31,699
Recurring Basis | U.S. treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	31,679	31,699
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	43,036	43,135
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	43,036	43,135
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	849,239	879,437
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	849,239	879,437
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	1,686,646	1,772,105
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	1,686,646	1,772,105
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	1,995,809	2,181,876
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	1,995,809	2,181,876
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	83,825	85,123
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	83,825	85,123
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	617,992	659,459
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	617,992	659,459
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	412,716	416,054
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	412,716	416,054
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	56,411	57,942
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	56,411	57,942
Recurring Basis | Corporate bonds | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	$ 0	$ 0