SECURITIES (Securities Debt Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Trading Securities, Amortized Cost, Maturing in one year or less	$ 0
Trading Securities, Amortized Cost, Maturing after one year through five years	0
Trading Securities, Amortized Cost, Maturing after five years through ten years	0
Debt Securities, Trading, Debt Maturities, After Year Ten, Amortized Cost Basis	27,203
Debt Securities, Trading, Amortized Cost	27,203	$ 27,203
Trading Securities, Fair Value, Maturing in one year or less	0
Trading Securities, Fair Value, Maturing after one year through five years	0
Trading Securities, Fair Value, Maturing after five years through ten years	0
Debt Securities, Trading, Debt Maturities, After Year Ten, Fair Value	25,268
Trading Securities, Fair Value	25,268	28,694
Available-for-sale Securities, Amortized Cost, Maturing in one year or less	0
Available-for-sale Securities, Amortized Cost, Maturing after one year through five years	169,465
Available-for-sale Securities, Amortized Cost, Maturing after five years through ten years	385,977
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	2,219,530
Debt Securities, Available-for-sale, Amortized Cost	2,774,972	3,218,777
Available-for-sale Securities, Fair Value, Maturing in one year or less	0
Available-for-sale Securities, Fair Value, Maturing after one year through five years	151,453
Available-for-sale Securities, Fair Value, Maturing after five years through ten years	334,298
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	1,802,242
Debt Securities, Available-for-sale	2,287,993	2,789,031
Held-to-maturity Securities, Amortized Cost, Maturing in one year or less	17,239
Held-to-maturity Securities, Amortized Cost, Maturing after one year through five years	19,702
Held-to-maturity Securities, Amortized Cost, Maturing after five years through ten years	25,857
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	1,019,707
Held-to-maturity Securities, Amortized Cost	1,082,505	1,117,967
Held-to-maturity Securities, Fair Value, Maturing in one year or less	16,820
Held-to-maturity Securities, Fair Value, Maturing after one year through five years	18,871
Held-to-maturity Securities, Fair Value, Maturing after five years through ten years	24,234
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	793,728
Debt Securities, Held-to-maturity, Fair Value	$ 853,653	$ 942,180