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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 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 2,402 | $ 1,390
Due after one through five years | 24,675 | 24,899
Due after five through ten years | 160,390 | 127,948
Due after ten years | 1,112,693 | 1,151,260
Total debt securities with a single maturity date | 1,300,160 | 1,305,497
Total investment securities | 1,884,215 | 1,846,840
Fair Value |  |
Due in one year or less | 2,383 | 1,382
Due after one through five years | 22,920 | 23,372
Due after five through ten years | 144,580 | 120,385
Due after ten years | 958,356 | 1,027,158
Total debt securities with a single maturity date | 1,128,239 | 1,172,297
Total investment securities | 1,618,893 | 1,627,112
Amortized Cost |  |
Due in one year or less | 13,380 | 3,041
Due after one through five years | 113,750 | 118,592
Due after five through ten years | 139,308 | 135,805
Due after ten years | 1,191,857 | 1,217,265
Total debt securities with a single maturity date | 1,458,295 | 1,474,703
Total investment securities | 2,134,440 | 2,184,497
Fair Value |  |
Due in one year or less | 13,249 | 3,043
Due after one through five years | 106,226 | 111,723
Due after five through ten years | 125,618 | 126,461
Due after ten years | 963,585 | 1,018,801
Total debt securities with a single maturity date | 1,208,678 | 1,260,028
Total investment securities | 1,779,216 | 1,870,374
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
U.S. Government-sponsored mortgage-backed securities | 584,055 | 541,343
Fair Value |  |
U.S. Government-sponsored mortgage-backed securities | 490,654 | 454,815
Total investment securities | 490,654 | 454,815
Amortized Cost |  |
U.S. Government-sponsored mortgage-backed securities | 676,145 | 709,794
Total investment securities | 676,145 | 709,794
Fair Value |  |
U.S. Government-sponsored mortgage-backed securities | 570,538 | 610,346
Total investment securities | $ 570,538 | $ 610,346

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