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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 85,823 | $ 98,420
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 78,924 | 99,898
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,959,270 | 4,180,589
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 3,531,353 | 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 | 13,484 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 13,425 |
After One Year Through Five Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 1,088 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 1,052 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 106,451 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 103,590 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 36,362 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 34,202 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 306,244 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 268,998 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 1,967 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 1,814 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 801,835 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 678,773 |
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 | 688,513 | 728,050
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 586,292 | 724,137
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 36,714 | 46,362
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 32,956 | 47,013
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 731,619 | 729,948
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 684,654 | 731,890
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 9,692 | 11,882
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 8,900 | 12,103
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 550,209 | 696,258
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 489,848 | 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 | 760,915 | 720,638
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 705,773 | $ 719,581

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