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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 77,985 | $ 80,321
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 71,126 | 71,688
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,418,334 | 3,382,604
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 3,157,265 | 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 | 6,860 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 6,878 |
After One Year Through Five Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 5,137 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 5,233 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 110,769 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 103,568 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 32,760 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 30,353 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 238,451 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 209,263 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 1,615 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 1,384 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 504,684 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 426,993 |
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 | 978,973 | 744,546
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 913,941 | 661,048
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 31,242 | 32,926
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 27,464 | 28,298
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 415,811 | 543,134
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 392,569 | 507,230
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 7,231 | 7,970
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 6,692 | 7,431
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 605,547 | 478,744
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 564,334 | 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 | 557,239 | 600,055
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 539,719 | $ 560,248

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