INVESTMENT SECURITIES - Schedule of Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available for Sale Amortized Cost
Within one year	$ 0	$ 0
After one year but within five years	83,014	103,960
After five years but within ten years	465,777	204,186
After ten years	4,285,759	4,941,736
Amortized Cost	4,834,550	5,249,882
Available for Sale Fair Value
Within one year	0	0
After one year but within five years	77,499	107,009
After five years but within ten years	398,607	204,289
After ten years	3,616,954	4,894,013
Fair Value	4,093,060	5,205,311
Held to Maturity, Amortized Cost
Within one year	731	232
After one year but within five years	9,530	2,675
After five years but within ten years	46,170	44,137
After ten years	1,055,198	43,602
Amortized Cost	1,111,629	90,646
Held to Maturity, Fair Value
Within one year	732	234
After one year but within five years	9,476	2,736
After five years but within ten years	45,944	45,404
After ten years	983,952	45,757
Fair Value	$ 1,040,104	$ 94,131