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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 49,631 | $ 58,545
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 45,373 | 54,334
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,198,638 | 4,182,075
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 4,953,023 | 3,971,932
One Year or Less [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 1,213 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 1,212 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 34,196 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 34,132 |
After One Year Through Five Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 14,290 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 14,202 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 95,609 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 87,628 |
After Five Years Through Ten Years [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 | 235,436 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 210,923 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 1,355 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 1,167 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 618,379 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 554,733 |
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 | 2,008,226 | 1,607,916
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 1,928,587 | 1,549,414
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 26,927 | 27,373
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 23,459 | 23,981
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 441,285 | 394,129
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 425,644 | 381,600
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 5,846 | 6,088
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 5,333 | 5,589
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,096,428 | 741,819
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 1,056,635 | 709,237
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 | 669,079 | 568,366
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 654,741 | $ 556,544

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