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INVESTMENT SECURITIES - Schedule of Investment Securities' Gross Unrealized Losses and Fair Value by Investment Category (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Available-for-sale debt securities: |  |
Available-for-sale debt securities, Less than 12 months, Fair value | $ 5,022 | $ 19,611
Available-for-sale debt securities, Less than 12 months, Unrealized loss | 10 | 342
Available-for-sale debt securities, 12 months or longer, Fair value | 3,669,681 | 3,819,041
Available-for-sale debt securities, 12 months or longer, Unrealized loss | 555,094 | 657,631
Available-for-sale debt securities, Total, Fair value | 3,674,703 | 3,838,652
Available-for-sale debt securities, Total, Unrealized loss | 555,104 | 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 | 444,751 | 464,619
Available-for-sale debt securities, 12 months or longer, Unrealized loss | 82,749 | 96,333
Available-for-sale debt securities, Total, Fair value | 444,751 | 464,619
Available-for-sale debt securities, Total, Unrealized loss | 82,749 | 96,333
FNMA MBS |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities, Less than 12 months, Fair value | 3,126 | 9,068
Available-for-sale debt securities, Less than 12 months, Unrealized loss | 7 | 125
Available-for-sale debt securities, 12 months or longer, Fair value | 2,889,219 | 3,026,520
Available-for-sale debt securities, 12 months or longer, Unrealized loss | 423,825 | 502,449
Available-for-sale debt securities, Total, Fair value | 2,892,345 | 3,035,588
Available-for-sale debt securities, Total, Unrealized loss | 423,832 | 502,574
FHLMC MBS |  |
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 | 111,801 | 115,525
Available-for-sale debt securities, 12 months or longer, Unrealized loss | 8,763 | 11,324
Available-for-sale debt securities, Total, Fair value | 111,801 | 115,525
Available-for-sale debt securities, Total, Unrealized loss | 8,763 | 11,324
GNMA MBS |  |
Available-for-sale debt securities: |  |
Available-for-sale debt securities, Less than 12 months, Fair value | 1,896 | 10,543
Available-for-sale debt securities, Less than 12 months, Unrealized loss | 3 | 217
Available-for-sale debt securities, 12 months or longer, Fair value | 37,791 | 31,681
Available-for-sale debt securities, 12 months or longer, Unrealized loss | 2,365 | 2,782
Available-for-sale debt securities, Total, Fair value | 39,687 | 42,224
Available-for-sale debt securities, Total, Unrealized loss | 2,368 | 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 | 186,119 | 180,696
Available-for-sale debt securities, 12 months or longer, Unrealized loss | 37,392 | 44,743
Available-for-sale debt securities, Total, Fair value | 186,119 | 180,696
Available-for-sale debt securities, Total, Unrealized loss | $ 37,392 | $ 44,743

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