SECURITIES (Amortized Cost of HTM Securities by Security Type and Credit Rating) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
HTM Securities, Amortized Cost	$ 756,872	$ 628,000
Moody's AAA/AA/A
HTM Securities, Amortized Cost	684,294	620,873
Moody's Not Rated - Agency
HTM Securities, Amortized Cost	72,578	7,127
U.S. government and agency securities
HTM Securities, Amortized Cost	2,483	2,604
U.S. government and agency securities | Moody's AAA/AA/A
HTM Securities, Amortized Cost	0	0
U.S. government and agency securities | Moody's Not Rated - Agency
HTM Securities, Amortized Cost	2,483	2,604
Obligations of states and political subdivisions
HTM Securities, Amortized Cost	684,294	620,873
Obligations of states and political subdivisions | Moody's AAA/AA/A
HTM Securities, Amortized Cost	684,294	620,873
Obligations of states and political subdivisions | Moody's Not Rated - Agency
HTM Securities, Amortized Cost	0	0
Mortgage-backed securities
HTM Securities, Amortized Cost	70,095	4,523
Mortgage-backed securities | Moody's AAA/AA/A
HTM Securities, Amortized Cost	0	0
Mortgage-backed securities | Moody's Not Rated - Agency
HTM Securities, Amortized Cost	$ 70,095	$ 4,523