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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 79,542 | $ 80,321
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 70,850 | 71,688
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,221,380 | 3,382,604
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 2,850,667 | 3,021,126
One Year or Less [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 0 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 0 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 10,537 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 10,514 |
After One Year Through Five Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 5,048 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 5,077 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 159,964 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 146,109 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 32,733 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 29,637 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 225,990 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 193,606 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 1,678 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 1,454 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 565,924 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 465,093 |
Residential Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 0 | 0
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 839,802 | 744,546
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 742,226 | 661,048
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 32,286 | 32,926
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 27,547 | 28,298
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 428,261 | 543,134
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 392,701 | 507,230
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 7,797 | 7,970
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 7,135 | 7,431
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 429,785 | 478,744
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 371,762 | 418,648
Asset-backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 0 | 0
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 561,117 | 600,055
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 528,656 | $ 560,248

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