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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND EQUITY SECURITIES - Schedule of Securities Available for Sale, Held to Maturity, and Equity Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
Securities available for sale |  |  |  |
Amortized Cost | $ 1,620,971 | $ 1,661,196 |  |
Gross Unrealized Gains | 883 | 571 |  |
Gross Unrealized Losses | (214,583) | (238,567) |  |
Fair Value | 1,407,271 | 1,423,200 |  |
Allowance | 0 | 0 |  |
Securities held to maturity |  |  |  |
Amortized Cost | 574,606 | 583,453 |  |
Gross Unrealized Gains | 1,181 | 699 |  |
Gross Unrealized Losses | (68,696) | (76,688) |  |
Fair Value | 507,091 | 507,464 |  |
Allowance | 71 | 91 | $ 99 | $ 105
Marketable equity securities, amortized cost | 15,036 | 15,035 |  |
Marketable equity securities, gross unrealized gains | 0 | 0 |  |
Marketable equity securities, gross unrealized losses | (1,964) | (2,179) |  |
Marketable equity securities, fair value | 13,072 | 12,856 |  |
Amortized Cost | 2,210,613 | 2,259,684 |  |
Gross Unrealized Gains | 2,064 | 1,270 |  |
Gross Unrealized Losses | (285,243) | (317,434) |  |
Fair Value | 1,927,434 | 1,943,520 |  |
Allowance | 71 | 91 |  |
U.S Treasuries |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 8,981 | 11,972 |  |
Gross Unrealized Gains | 0 | 1 |  |
Gross Unrealized Losses | 0 | 0 |  |
Fair Value | 8,981 | 11,973 |  |
Allowance |  | 0 |  |
Municipal bonds and obligations |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 65,849 | 65,943 |  |
Gross Unrealized Gains | 749 | 422 |  |
Gross Unrealized Losses | (1,981) | (3,030) |  |
Fair Value | 64,617 | 63,335 |  |
Allowance | 0 | 0 |  |
Securities held to maturity |  |  |  |
Amortized Cost | 263,818 | 266,793 |  |
Gross Unrealized Gains | 1,174 | 691 |  |
Gross Unrealized Losses | (19,260) | (23,704) |  |
Fair Value | 245,732 | 243,780 |  |
Allowance | 49 | 66 | 67 | 70
Agency collateralized mortgage obligations |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 612,727 | 631,732 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | (86,778) | (99,787) |  |
Fair Value | 525,949 | 531,945 |  |
Allowance | 0 | 0 |  |
Securities held to maturity |  |  |  |
Amortized Cost | 124,335 | 128,136 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | (18,041) | (20,420) |  |
Fair Value | 106,294 | 107,716 |  |
Allowance | 0 | 0 |  |
Agency mortgage-backed securities |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 628,243 | 643,308 |  |
Gross Unrealized Gains | 1 | 1 |  |
Gross Unrealized Losses | (88,647) | (96,996) |  |
Fair Value | 539,597 | 546,313 |  |
Allowance | 0 | 0 |  |
Securities held to maturity |  |  |  |
Amortized Cost | 50,152 | 50,958 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | (8,511) | (9,240) |  |
Fair Value | 41,641 | 41,718 |  |
Allowance | 0 | 0 |  |
Agency commercial mortgage-backed securities |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 261,167 | 264,218 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | (33,759) | (35,750) |  |
Fair Value | 227,408 | 228,468 |  |
Allowance | 0 | 0 |  |
Securities held to maturity |  |  |  |
Amortized Cost | 134,180 | 135,206 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | (22,781) | (23,203) |  |
Fair Value | 111,399 | 112,003 |  |
Allowance | 0 | 0 |  |
Corporate bonds |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 43,349 | 43,368 |  |
Gross Unrealized Gains | 66 | 80 |  |
Gross Unrealized Losses | (3,352) | (2,938) |  |
Fair Value | 40,063 | 40,510 |  |
Allowance | 0 | 0 |  |
Tax advantaged economic development bonds |  |  |  |
Securities held to maturity |  |  |  |
Amortized Cost | 1,830 | 2,069 |  |
Gross Unrealized Gains | 7 | 8 |  |
Gross Unrealized Losses | (103) | (121) |  |
Fair Value | 1,734 | 1,956 |  |
Allowance | 22 | 25 | $ 32 | $ 35
Other bonds and obligations |  |  |  |
Securities available for sale |  |  |  |
Amortized Cost | 655 | 655 |  |
Gross Unrealized Gains | 67 | 67 |  |
Gross Unrealized Losses | (66) | (66) |  |
Fair Value | 656 | 656 |  |
Allowance | 0 | 0 |  |
Securities held to maturity |  |  |  |
Amortized Cost | 291 | 291 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | 0 | 0 |  |
Fair Value | 291 | 291 |  |
Allowance | $ 0 | $ 0 |  |

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