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INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 1,809 | $ 1,390
Due after one through five years | 12,818 | 24,899
Due after five through ten years | 162,996 | 127,948
Due after ten years | 1,023,957 | 1,151,260
Total debt securities with a single maturity date | 1,201,580 | 1,305,497
Total investment securities | 1,742,679 | 1,846,840
Fair Value |  |
Due in one year or less | 1,800 | 1,382
Due after one through five years | 12,578 | 23,372
Due after five through ten years | 151,369 | 120,385
Due after ten years | 915,703 | 1,027,158
Total debt securities with a single maturity date | 1,081,450 | 1,172,297
Total investment securities | 1,553,496 | 1,627,112
Amortized Cost |  |
Due in one year or less | 15,139 | 3,041
Due after one through five years | 121,204 | 118,592
Due after five through ten years | 165,418 | 135,805
Due after ten years | 1,149,054 | 1,217,265
Total debt securities with a single maturity date | 1,450,815 | 1,474,703
Total investment securities | 2,108,894 | 2,184,497
Fair Value |  |
Due in one year or less | 15,096 | 3,043
Due after one through five years | 116,480 | 111,723
Due after five through ten years | 151,803 | 126,461
Due after ten years | 963,930 | 1,018,801
Total debt securities with a single maturity date | 1,247,309 | 1,260,028
Total investment securities | 1,823,006 | 1,870,374
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
U.S. Government-sponsored mortgage-backed securities | 541,099 | 541,343
Fair Value |  |
U.S. Government-sponsored mortgage-backed securities | 472,046 | 454,815
Total investment securities | 472,046 | 454,815
Amortized Cost |  |
U.S. Government-sponsored mortgage-backed securities | 658,079 | 709,794
Total investment securities | 658,079 | 709,794
Fair Value |  |
U.S. Government-sponsored mortgage-backed securities | 575,697 | 610,346
Total investment securities | $ 575,697 | $ 610,346

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