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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 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 1,861 | $ 2,822
Due after one through five years | 21,853 | 11,694
Due after five through ten years | 118,743 | 169,729
Due after ten years | 1,312,894 | 1,480,472
Total debt securities with a single maturity date | 1,455,351 | 1,664,717
Total investment securities | 2,039,927 | 2,273,347
Fair Value |  |
Due in one year or less | 1,854 | 2,809
Due after one through five years | 20,346 | 11,265
Due after five through ten years | 113,564 | 161,211
Due after ten years | 1,164,839 | 1,293,103
Total debt securities with a single maturity date | 1,300,603 | 1,468,388
Total investment securities | 1,794,208 | 1,976,661
Amortized Cost |  |
Due in one year or less | 12,168 | 13,697
Due after one through five years | 112,941 | 80,697
Due after five through ten years | 120,969 | 147,078
Due after ten years | 1,258,569 | 1,269,826
Total debt securities with a single maturity date | 1,504,647 | 1,511,298
Amortized Cost | 2,263,426 | 2,287,372
Fair Value |  |
Due in one year or less | 12,225 | 13,749
Due after one through five years | 105,185 | 76,453
Due after five through ten years | 114,725 | 135,027
Due after ten years | 1,045,755 | 1,020,477
Total debt securities with a single maturity date | 1,277,890 | 1,245,706
Investment securities held to maturity | 1,934,601 | 1,907,865
U.S. Government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
U.S. Government-sponsored mortgage-backed securities | 584,576 | 608,630
Fair Value |  |
U.S. Government-sponsored mortgage-backed securities | 493,605 | 508,273
Total investment securities | 493,605 | 508,273
Amortized Cost |  |
U.S. Government-sponsored mortgage-backed securities | 758,779 | 776,074
Amortized Cost | 758,779 | 776,074
Fair Value |  |
U.S. Government-sponsored mortgage-backed securities | 656,711 | 662,159
Investment securities held to maturity | $ 656,711 | $ 662,159

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