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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 | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
Securities available for sale |  |  |  |  |  |
Amortized Cost | $ 1,578,544 | $ 1,661,196 |  |  |  |
Gross Unrealized Gains | 404 | 571 |  |  |  |
Gross Unrealized Losses | (238,617) | (238,567) |  |  |  |
Fair Value | 1,340,331 | 1,423,200 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 563,765 | 583,453 |  |  |  |
Gross Unrealized Gains | 408 | 699 |  |  |  |
Gross Unrealized Losses | (76,213) | (76,688) |  |  |  |
Fair Value | 487,960 | 507,464 |  |  |  |
Allowance | 71 | 91 | $ 71 | $ 94 | $ 99 | $ 105
Marketable equity securities, amortized cost | 15,035 | 15,035 |  |  |  |
Marketable equity securities, gross unrealized gains | 0 | 0 |  |  |  |
Marketable equity securities, gross unrealized losses | (2,167) | (2,179) |  |  |  |
Marketable equity securities, fair value | 12,868 | 12,856 |  |  |  |
Amortized Cost | 2,157,344 | 2,259,684 |  |  |  |
Gross Unrealized Gains | 812 | 1,270 |  |  |  |
Gross Unrealized Losses | (316,997) | (317,434) |  |  |  |
Fair Value | 1,841,159 | 1,943,520 |  |  |  |
Allowance | 71 | 91 |  |  |  |
U.S Treasuries |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 7,979 | 11,972 |  |  |  |
Gross Unrealized Gains | 2 | 1 |  |  |  |
Gross Unrealized Losses | 0 | 0 |  |  |  |
Fair Value | 7,981 | 11,973 |  |  |  |
Allowance |  | 0 |  |  |  |
Municipal bonds and obligations |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 65,840 | 65,943 |  |  |  |
Gross Unrealized Gains | 275 | 422 |  |  |  |
Gross Unrealized Losses | (2,493) | (3,030) |  |  |  |
Fair Value | 63,622 | 63,335 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 259,843 | 266,793 |  |  |  |
Gross Unrealized Gains | 401 | 691 |  |  |  |
Gross Unrealized Losses | (21,405) | (23,704) |  |  |  |
Fair Value | 238,839 | 243,780 |  |  |  |
Allowance | 49 | 66 | 49 | 66 | 67 | 70
Agency collateralized mortgage obligations |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 591,299 | 631,732 |  |  |  |
Gross Unrealized Gains | 0 | 0 |  |  |  |
Gross Unrealized Losses | (99,959) | (99,787) |  |  |  |
Fair Value | 491,340 | 531,945 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 120,349 | 128,136 |  |  |  |
Gross Unrealized Gains | 0 | 0 |  |  |  |
Gross Unrealized Losses | (20,469) | (20,420) |  |  |  |
Fair Value | 99,880 | 107,716 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Agency mortgage-backed securities |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 611,157 | 643,308 |  |  |  |
Gross Unrealized Gains | 0 | 1 |  |  |  |
Gross Unrealized Losses | (92,605) | (96,996) |  |  |  |
Fair Value | 518,552 | 546,313 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 49,231 | 50,958 |  |  |  |
Gross Unrealized Gains | 0 | 0 |  |  |  |
Gross Unrealized Losses | (8,973) | (9,240) |  |  |  |
Fair Value | 40,258 | 41,718 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Agency commercial mortgage-backed securities |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 258,283 | 264,218 |  |  |  |
Gross Unrealized Gains | 0 | 0 |  |  |  |
Gross Unrealized Losses | (38,506) | (35,750) |  |  |  |
Fair Value | 219,777 | 228,468 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 132,320 | 135,206 |  |  |  |
Gross Unrealized Gains | 0 | 0 |  |  |  |
Gross Unrealized Losses | (25,272) | (23,203) |  |  |  |
Fair Value | 107,048 | 112,003 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Corporate bonds |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 43,331 | 43,368 |  |  |  |
Gross Unrealized Gains | 60 | 80 |  |  |  |
Gross Unrealized Losses | (4,988) | (2,938) |  |  |  |
Fair Value | 38,403 | 40,510 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Tax advantaged economic development bonds |  |  |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 1,734 | 2,069 |  |  |  |
Gross Unrealized Gains | 7 | 8 |  |  |  |
Gross Unrealized Losses | (94) | (121) |  |  |  |
Fair Value | 1,647 | 1,956 |  |  |  |
Allowance | 22 | 25 | $ 22 | $ 28 | $ 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 | 288 | 291 |  |  |  |
Gross Unrealized Gains | 0 | 0 |  |  |  |
Gross Unrealized Losses | 0 | 0 |  |  |  |
Fair Value | 288 | 291 |  |  |  |
Allowance | $ 0 | $ 0 |  |  |  |

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