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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND EQUITY SECURITIES - Schedule of Securities with Unrealized Losses, Segregated by the Duration of their Continuous Unrealized Loss Positions (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | $ 2,926 | $ 40,176
Less Than Twelve Months, Fair Value | 52,392 | 443,798
Over Twelve Months, Gross Unrealized Losses | 235,691 | 198,391
Over Twelve Months, Fair Value | 1,257,842 | 938,147
Total Gross Unrealized Losses | 238,617 | 238,567
Total Fair Value | 1,310,234 | 1,381,945
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 3,419 | 8,958
Less Than Twelve Months, Fair Value | 123,807 | 187,307
Over Twelve Months, Gross Unrealized Losses | 72,794 | 67,730
Over Twelve Months, Fair Value | 288,625 | 239,115
Total Gross Unrealized Losses | 76,213 | 76,688
Total Fair Value | 412,432 | 426,422
Securities available for sale and held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 6,345 | 49,134
Less Than Twelve Months, Fair Value | 176,199 | 631,105
Over Twelve Months, Gross Unrealized Losses | 308,485 | 266,121
Over Twelve Months, Fair Value | 1,546,467 | 1,177,262
Total Gross Unrealized Losses | 314,830 | 315,255
Total Fair Value | 1,722,666 | 1,808,367
Municipal bonds and obligations |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 550 | 2,406
Less Than Twelve Months, Fair Value | 24,993 | 36,696
Over Twelve Months, Gross Unrealized Losses | 1,943 | 624
Over Twelve Months, Fair Value | 17,862 | 2,763
Total Gross Unrealized Losses | 2,493 | 3,030
Total Fair Value | 42,855 | 39,459
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 1,710 | 5,476
Less Than Twelve Months, Fair Value | 89,477 | 125,494
Over Twelve Months, Gross Unrealized Losses | 19,695 | 18,228
Over Twelve Months, Fair Value | 74,807 | 38,341
Total Gross Unrealized Losses | 21,405 | 23,704
Total Fair Value | 164,284 | 163,835
Agency collateralized mortgage obligations |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 113 | 23,052
Less Than Twelve Months, Fair Value | 2,276 | 247,509
Over Twelve Months, Gross Unrealized Losses | 99,846 | 76,735
Over Twelve Months, Fair Value | 489,064 | 284,434
Total Gross Unrealized Losses | 99,959 | 99,787
Total Fair Value | 491,340 | 531,943
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 1,709 | 2,734
Less Than Twelve Months, Fair Value | 34,330 | 49,539
Over Twelve Months, Gross Unrealized Losses | 18,760 | 17,686
Over Twelve Months, Fair Value | 65,550 | 58,177
Total Gross Unrealized Losses | 20,469 | 20,420
Total Fair Value | 99,880 | 107,716
Agency mortgage-backed securities |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 157 | 3,124
Less Than Twelve Months, Fair Value | 2,648 | 37,540
Over Twelve Months, Gross Unrealized Losses | 92,448 | 93,872
Over Twelve Months, Fair Value | 515,824 | 508,683
Total Gross Unrealized Losses | 92,605 | 96,996
Total Fair Value | 518,472 | 546,223
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 0 | 300
Less Than Twelve Months, Fair Value | 0 | 2,419
Over Twelve Months, Gross Unrealized Losses | 8,973 | 8,940
Over Twelve Months, Fair Value | 40,258 | 39,299
Total Gross Unrealized Losses | 8,973 | 9,240
Total Fair Value | 40,258 | 41,718
Agency commercial mortgage-backed securities |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 1,042 | 9,885
Less Than Twelve Months, Fair Value | 9,678 | 96,396
Over Twelve Months, Gross Unrealized Losses | 37,464 | 25,865
Over Twelve Months, Fair Value | 210,099 | 132,043
Total Gross Unrealized Losses | 38,506 | 35,750
Total Fair Value | 219,777 | 228,439
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 0 | 447
Less Than Twelve Months, Fair Value | 0 | 9,713
Over Twelve Months, Gross Unrealized Losses | 25,272 | 22,756
Over Twelve Months, Fair Value | 107,048 | 102,290
Total Gross Unrealized Losses | 25,272 | 23,203
Total Fair Value | 107,048 | 112,003
Corporate bonds |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 1,064 | 1,709
Less Than Twelve Months, Fair Value | 12,797 | 25,657
Over Twelve Months, Gross Unrealized Losses | 3,924 | 1,229
Over Twelve Months, Fair Value | 24,698 | 9,929
Total Gross Unrealized Losses | 4,988 | 2,938
Total Fair Value | 37,495 | 35,586
Other bonds and obligations |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 0 | 0
Less Than Twelve Months, Fair Value | 0 | 0
Over Twelve Months, Gross Unrealized Losses | 66 | 66
Over Twelve Months, Fair Value | 295 | 295
Total Gross Unrealized Losses | 66 | 66
Total Fair Value | 295 | 295
Securities held to maturity |  |
Total Gross Unrealized Losses | 0 | 0
Tax advantaged economic development bonds |  |
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 0 | 1
Less Than Twelve Months, Fair Value | 0 | 142
Over Twelve Months, Gross Unrealized Losses | 94 | 120
Over Twelve Months, Fair Value | 962 | 1,008
Total Gross Unrealized Losses | 94 | 121
Total Fair Value | $ 962 | $ 1,150

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