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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 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 1,800 | $ 1,390
Due after one through five years | 12,189 | 24,899
Due after five through ten years | 168,338 | 127,948
Due after ten years | 922,636 | 1,151,260
Total debt securities with a single maturity date | 1,104,963 | 1,305,497
Amortized Cost | 1,624,906 | 1,846,840
Fair Value |  |
Due in one year or less | 1,795 | 1,382
Due after one through five years | 11,857 | 23,372
Due after five through ten years | 151,467 | 120,385
Due after ten years | 789,734 | 1,027,158
Total debt securities with a single maturity date | 954,853 | 1,172,297
Total Investment Securities | 1,386,475 | 1,627,112
Amortized Cost |  |
Due in one year or less | 5,268 | 3,041
Due after one through five years | 124,004 | 118,592
Due after five through ten years | 174,533 | 135,805
Due after ten years | 1,129,147 | 1,217,265
Total debt securities with a single maturity date | 1,432,952 | 1,474,703
Amortized Cost | 2,074,465 | 2,184,497
Fair Value |  |
Due in one year or less | 5,254 | 3,043
Due after one through five years | 117,999 | 111,723
Due after five through ten years | 154,533 | 126,461
Due after ten years | 906,564 | 1,018,801
Total debt securities with a single maturity date | 1,184,350 | 1,260,028
Total Investment Securities | 1,723,520 | 1,870,374
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
U.S. Government-sponsored mortgage-backed securities | 519,943 | 541,343
Amortized Cost | 519,943 | 541,343
Fair Value |  |
Without single maturity date | 431,622 | 454,815
Total Investment Securities | 431,622 | 454,815
Amortized Cost |  |
Without single maturity date | 641,513 | 709,794
Amortized Cost | 641,513 | 709,794
Fair Value |  |
Without single maturity date | 539,170 | 610,346
Total Investment Securities | $ 539,170 | $ 610,346

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