INVESTMENT SECURITIES - Investment Securities Gross Unrealized Losses and Fair Value by Investment Category (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Available-for-sale debt securities:
Available-for-sale debt securities, Less than 12 months, Fair Value	$ 51,381	$ 19,611
Available-for-sale debt securities, Less than 12 months, Unrealized Loss	668	342
Available-for-sale debt securities, 12 months or longer, Fair Value	3,430,940	3,819,041
Available-for-sale debt securities, 12 months or longer, Unrealized Loss	707,235	657,631
Available-for-sale debt securities, Total, Fair Value	3,482,321	3,838,652
Available-for-sale debt securities, Total, Unrealized Loss	707,903	657,973
CMO
Available-for-sale debt securities:
Available-for-sale debt securities, Less than 12 months, Fair Value	0	0
Available-for-sale debt securities, Less than 12 months, Unrealized Loss	0	0
Available-for-sale debt securities, 12 months or longer, Fair Value	420,663	464,619
Available-for-sale debt securities, 12 months or longer, Unrealized Loss	95,967	96,333
Available-for-sale debt securities, Total, Fair Value	420,663	464,619
Available-for-sale debt securities, Total, Unrealized Loss	95,967	96,333
FNMA MBS
Available-for-sale debt securities:
Available-for-sale debt securities, Less than 12 months, Fair Value	46,971	9,068
Available-for-sale debt securities, Less than 12 months, Unrealized Loss	525	125
Available-for-sale debt securities, 12 months or longer, Fair Value	2,691,778	3,026,520
Available-for-sale debt securities, 12 months or longer, Unrealized Loss	549,486	502,449
Available-for-sale debt securities, Total, Fair Value	2,738,749	3,035,588
Available-for-sale debt securities, Total, Unrealized Loss	550,011	502,574
FHLMC MBS
Available-for-sale debt securities:
Available-for-sale debt securities, Less than 12 months, Fair Value	6	0
Available-for-sale debt securities, Less than 12 months, Unrealized Loss	0	0
Available-for-sale debt securities, 12 months or longer, Fair Value	105,508	115,525
Available-for-sale debt securities, 12 months or longer, Unrealized Loss	13,091	11,324
Available-for-sale debt securities, Total, Fair Value	105,514	115,525
Available-for-sale debt securities, Total, Unrealized Loss	13,091	11,324
GNMA MBS
Available-for-sale debt securities:
Available-for-sale debt securities, Less than 12 months, Fair Value	4,404	10,543
Available-for-sale debt securities, Less than 12 months, Unrealized Loss	143	217
Available-for-sale debt securities, 12 months or longer, Fair Value	35,054	31,681
Available-for-sale debt securities, 12 months or longer, Unrealized Loss	3,759	2,782
Available-for-sale debt securities, Total, Fair Value	39,458	42,224
Available-for-sale debt securities, Total, Unrealized Loss	3,902	2,999
GSE agency notes
Available-for-sale debt securities:
Available-for-sale debt securities, Less than 12 months, Fair Value	0	0
Available-for-sale debt securities, Less than 12 months, Unrealized Loss	0	0
Available-for-sale debt securities, 12 months or longer, Fair Value	177,937	180,696
Available-for-sale debt securities, 12 months or longer, Unrealized Loss	44,932	44,743
Available-for-sale debt securities, Total, Fair Value	177,937	180,696
Available-for-sale debt securities, Total, Unrealized Loss	$ 44,932	$ 44,743

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