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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND MARKETABLE EQUITY SECURITIES - Summary of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Securities available for sale, Gross Unrealized Losses |  |
Less Than Twelve Months | $ 101,697 | $ 14,528
Over Twelve Months | 146,655 | 7,868
Total | 248,352 | 22,396
Securities available for sale, Fair Value |  |
Less Than Twelve Months | 849,913 | 712,488
Over Twelve Months | 591,350 | 252,279
Total | 1,441,263 | 964,767
Gross Unrealized Losses |  |
Less Than Twelve Months | 29,109 | 4,610
Over Twelve Months | 60,436 | 4,398
Total | 89,545 | 9,008
Fair Value |  |
Less Than Twelve Months | 246,814 | 194,606
Over Twelve Months | 213,572 | 113,891
Over Twelve Months | 460,386 | 308,497
Securities available for sale and held to maturity |  |
Held to maturity and available for sale securities continuous unrealized loss position, less than twelve months, aggregate losses | 130,806 | 19,138
Held to maturity and available for sale securities continuous unrealized loss position, less than twelve months, fair value | 1,096,727 | 907,094
Held to maturity and available for sale securities continuous unrealized loss position, over twelve months, aggregate losses | 207,091 | 12,266
Held to maturity and available for sale securities continuous unrealized loss position, over twelve months, fair value | 804,922 | 366,170
Held to maturity and available for sale securities continuous unrealized loss position, aggregate losses | 337,897 | 31,404
Held to maturity and available for sale securities continuous unrealized loss position, fair value | 1,901,649 | 1,273,264
U.S Treasuries |  |
Securities available for sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 0 |
Over Twelve Months | 0 |
Total | 0 |
Securities available for sale, Fair Value |  |
Less Than Twelve Months | 0 |
Over Twelve Months | 0 |
Total | 0 |
Municipal bonds and obligations |  |
Securities available for sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 5,854 |
Over Twelve Months | 0 |
Total | 5,854 |
Securities available for sale, Fair Value |  |
Less Than Twelve Months | 52,279 |
Over Twelve Months | 0 |
Total | 52,279 |
Gross Unrealized Losses |  |
Less Than Twelve Months | 22,075 | 693
Over Twelve Months | 14,371 | 0
Total | 36,446 | 693
Fair Value |  |
Less Than Twelve Months | 166,539 | 36,981
Over Twelve Months | 23,286 | 0
Over Twelve Months | 189,825 | 36,981
Agency collateralized mortgage obligations |  |
Securities available for sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 26,129 | 9,626
Over Twelve Months | 72,490 | 1,386
Total | 98,619 | 11,012
Securities available for sale, Fair Value |  |
Less Than Twelve Months | 293,758 | 375,132
Over Twelve Months | 263,754 | 27,025
Total | 557,512 | 402,157
Gross Unrealized Losses |  |
Less Than Twelve Months | 2,537 | 1,808
Over Twelve Months | 17,428 | 1,705
Total | 19,965 | 3,513
Fair Value |  |
Less Than Twelve Months | 52,558 | 49,308
Over Twelve Months | 60,408 | 36,212
Over Twelve Months | 112,966 | 85,520
Agency mortgage-backed securities |  |
Securities available for sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 48,764 | 3,179
Over Twelve Months | 57,565 | 4,463
Total | 106,329 | 7,642
Securities available for sale, Fair Value |  |
Less Than Twelve Months | 314,987 | 222,887
Over Twelve Months | 238,651 | 175,941
Total | 553,638 | 398,828
Gross Unrealized Losses |  |
Less Than Twelve Months | 340 | 839
Over Twelve Months | 9,993 | 659
Total | 10,333 | 1,498
Fair Value |  |
Less Than Twelve Months | 2,410 | 26,656
Over Twelve Months | 39,432 | 26,025
Over Twelve Months | 41,842 | 52,681
Agency commercial mortgage-backed securities |  |
Securities available for sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 19,323 | 1,609
Over Twelve Months | 15,710 | 2,019
Total | 35,033 | 3,628
Securities available for sale, Fair Value |  |
Less Than Twelve Months | 154,763 | 103,354
Over Twelve Months | 80,799 | 49,313
Total | 235,562 | 152,667
Gross Unrealized Losses |  |
Less Than Twelve Months | 4,156 | 1,255
Over Twelve Months | 18,503 | 2,034
Total | 22,659 | 3,289
Fair Value |  |
Less Than Twelve Months | 25,094 | 80,406
Over Twelve Months | 89,423 | 51,654
Over Twelve Months | 114,517 | 132,060
Corporate bonds |  |
Securities available for sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,627 | 114
Over Twelve Months | 824 | 0
Total | 2,451 | 114
Securities available for sale, Fair Value |  |
Less Than Twelve Months | 34,126 | 11,115
Over Twelve Months | 7,851 | 0
Total | 41,977 | 11,115
Other bonds and obligations |  |
Securities available for sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 0 |
Over Twelve Months | 66 |
Total | 66 |
Securities available for sale, Fair Value |  |
Less Than Twelve Months | 0 |
Over Twelve Months | 295 |
Total | 295 |
Gross Unrealized Losses |  |
Total | 0 | 0
Tax advantaged economic development bonds |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 1 | 15
Over Twelve Months | 141 | 0
Total | 142 | 15
Fair Value |  |
Less Than Twelve Months | 213 | 1,255
Over Twelve Months | 1,023 | 0
Over Twelve Months | $ 1,236 | $ 1,255

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