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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 78,921 | $ 80,321
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 70,066 | 71,688
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,410,038 | 3,382,604
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 3,036,758 | 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 | 10,536 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 10,542 |
After One Year Through Five Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 5,092 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 5,070 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 159,963 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 146,287 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 32,747 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 29,909 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 250,521 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 211,774 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 1,655 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 1,424 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 532,565 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 434,193 |
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 | 909,468 | 744,546
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 807,123 | 661,048
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 31,961 | 32,926
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 27,070 | 28,298
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 438,738 | 543,134
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 405,273 | 507,230
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 7,466 | 7,970
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 6,593 | 7,431
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 529,316 | 478,744
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 472,465 | 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 | 578,931 | 600,055
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 549,101 | $ 560,248

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