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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 88,057 | $ 98,420
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 83,990 | 99,898
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 4,128,546 | 4,180,589
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 3,843,580 | 4,207,846
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 | 6,850 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 6,839 |
After One Year Through Five Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 1,080 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 1,082 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 105,078 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 103,623 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 36,316 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 35,350 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 359,473 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 336,171 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 2,156 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 2,054 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 842,383 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 765,553 |
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 | 697,784 | 728,050
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 627,752 | 724,137
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 38,327 | 46,362
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 35,786 | 47,013
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 762,091 | 729,948
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 730,367 | 731,890
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 10,178 | 11,882
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 9,718 | 12,103
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 556,531 | 696,258
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 516,843 | 697,740
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 | 798,356 | 720,638
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 756,432 | $ 719,581

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