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SECURITIES - Schedule of Securities Available for Sale (AFS) and Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Securities available for sale |  |  |  |
Amortized Cost | $ 1,661,196 | $ 1,881,813 |  |
Gross Unrealized Gains | 571 | 18,168 |  |
Gross Unrealized Losses | (238,567) | (22,396) |  |
Fair Value | 1,423,200 | 1,877,585 |  |
Securities available for sale, Allowance | 0 | 0 |  |
Securities held to maturity |  |  |  |
Amortized Cost | 583,453 | 636,503 |  |
Gross Unrealized Gains | 699 | 19,741 |  |
Gross Unrealized Losses | (76,688) | (9,008) |  |
Fair Value | 507,464 | 647,236 |  |
Securities held to maturity, Allowance | 91 | 105 | $ 104 | $ 0
Marketable equity securities, Amortized Cost | 15,035 | 15,689 |  |
Marketable equity securities, Gross Unrealized Gains | 0 | 67 |  |
Marketable equity securities, Gross Unrealized Losses | (2,179) | (303) |  |
Marketable equity securities, Fair Value | 12,856 | 15,453 |  |
Amortized Cost | 2,259,684 | 2,534,005 |  |
Gross Unrealized Gains | 1,270 | 37,976 |  |
Gross Unrealized Losses | (317,434) | (31,707) |  |
Fair Value | 1,943,520 | 2,540,274 |  |
Allowance | 91 | 105 |  |
U.S Treasuries |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 11,972 | 59,972 |  |
Gross Unrealized Gains | 1 | 1 |  |
Gross Unrealized Losses | 0 | 0 |  |
Fair Value | 11,973 | 59,973 |  |
Securities available for sale, Allowance | 0 | 0 |  |
Municipal bonds and obligations |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 65,943 | 71,822 |  |
Gross Unrealized Gains | 422 | 5,355 |  |
Gross Unrealized Losses | (3,030) | 0 |  |
Fair Value | 63,335 | 77,177 |  |
Securities available for sale, Allowance | 0 | 0 |  |
Securities held to maturity |  |  |  |
Amortized Cost | 266,793 | 281,515 |  |
Gross Unrealized Gains | 691 | 16,151 |  |
Gross Unrealized Losses | (23,704) | (693) |  |
Fair Value | 243,780 | 296,973 |  |
Securities held to maturity, Allowance | 66 | 70 | 64 | 0
Agency collateralized mortgage obligations |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 631,732 | 693,782 |  |
Gross Unrealized Gains | 0 | 5,566 |  |
Gross Unrealized Losses | (99,787) | (11,012) |  |
Fair Value | 531,945 | 688,336 |  |
Securities available for sale, Allowance | 0 | 0 |  |
Securities held to maturity |  |  |  |
Amortized Cost | 128,136 | 149,195 |  |
Gross Unrealized Gains | 0 | 3,203 |  |
Gross Unrealized Losses | (20,420) | (3,513) |  |
Fair Value | 107,716 | 148,885 |  |
Securities held to maturity, Allowance | 0 | 0 |  |
Agency mortgage-backed securities |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 643,308 | 711,154 |  |
Gross Unrealized Gains | 1 | 2,347 |  |
Gross Unrealized Losses | (96,996) | (7,642) |  |
Fair Value | 546,313 | 705,859 |  |
Securities available for sale, Allowance | 0 | 0 |  |
Securities held to maturity |  |  |  |
Amortized Cost | 50,958 | 57,327 |  |
Gross Unrealized Gains | 0 | 95 |  |
Gross Unrealized Losses | (9,240) | (1,498) |  |
Fair Value | 41,718 | 55,924 |  |
Securities held to maturity, Allowance | 0 | 0 |  |
Agency commercial mortgage-backed securities |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 264,218 | 300,259 |  |
Gross Unrealized Gains | 0 | 3,949 |  |
Gross Unrealized Losses | (35,750) | (3,628) |  |
Fair Value | 228,468 | 300,580 |  |
Securities available for sale, Allowance | 0 | 0 |  |
Securities held to maturity |  |  |  |
Amortized Cost | 135,206 | 145,573 |  |
Gross Unrealized Gains | 0 | 266 |  |
Gross Unrealized Losses | (23,203) | (3,289) |  |
Fair Value | 112,003 | 142,550 |  |
Securities held to maturity, Allowance | 0 | 0 |  |
Corporate bonds |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 43,368 | 44,824 |  |
Gross Unrealized Gains | 80 | 950 |  |
Gross Unrealized Losses | (2,938) | (114) |  |
Fair Value | 40,510 | 45,660 |  |
Securities available for sale, Allowance | 0 | 0 |  |
Tax advantaged economic development bonds |  |  |  |
Securities held to maturity |  |  |  |
Amortized Cost | 2,069 | 2,728 |  |
Gross Unrealized Gains | 8 | 26 |  |
Gross Unrealized Losses | (121) | (15) |  |
Fair Value | 1,956 | 2,739 |  |
Securities held to maturity, Allowance | 25 | 35 | $ 40 | $ 0
Other bonds and obligations |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 655 | 0 |  |
Gross Unrealized Gains | 67 | 0 |  |
Gross Unrealized Losses | (66) | 0 |  |
Fair Value | 656 | 0 |  |
Securities available for sale, Allowance | 0 | 0 |  |
Securities held to maturity |  |  |  |
Amortized Cost | 291 | 165 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | 0 | 0 |  |
Fair Value | 291 | 165 |  |
Securities held to maturity, Allowance | $ 0 | $ 0 |  |

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