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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 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | $ 61 | $ 534
Less Than Twelve Months, Fair Value | 10,885 | 15,891
Over Twelve Months, Gross Unrealized Losses | 120,884 | 188,991
Over Twelve Months, Fair Value | 576,912 | 965,075
Total Gross Unrealized Losses | 120,945 | 189,525
Total Fair Value | 587,797 | 980,966
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 112 | 230
Less Than Twelve Months, Fair Value | 35,140 | 28,916
Over Twelve Months, Gross Unrealized Losses | 61,392 | 67,597
Over Twelve Months, Fair Value | 345,529 | 332,661
Total Gross Unrealized Losses | 61,504 | 67,827
Total Fair Value | 380,669 | 361,577
Securities available for sale and held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 173 | 764
Less Than Twelve Months, Fair Value | 46,025 | 44,807
Over Twelve Months, Gross Unrealized Losses | 182,276 | 256,588
Over Twelve Months, Fair Value | 922,441 | 1,297,736
Total Gross Unrealized Losses | 182,449 | 257,352
Total Fair Value | 968,466 | 1,342,543
U.S. Treasuries |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 0 |
Less Than Twelve Months, Fair Value | 0 |
Over Twelve Months, Gross Unrealized Losses | 0 |
Over Twelve Months, Fair Value | 0 |
Total Gross Unrealized Losses | 0 |
Total Fair Value | 0 |
Municipal bonds and obligations |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 61 | 76
Less Than Twelve Months, Fair Value | 10,885 | 9,326
Over Twelve Months, Gross Unrealized Losses | 1,347 | 1,353
Over Twelve Months, Fair Value | 26,465 | 22,739
Total Gross Unrealized Losses | 1,408 | 1,429
Total Fair Value | 37,350 | 32,065
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 107 | 229
Less Than Twelve Months, Fair Value | 34,770 | 28,895
Over Twelve Months, Gross Unrealized Losses | 16,980 | 16,758
Over Twelve Months, Fair Value | 115,023 | 92,063
Total Gross Unrealized Losses | 17,087 | 16,987
Total Fair Value | 149,793 | 120,958
Agency collateralized mortgage 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 | 56,765 | 79,112
Over Twelve Months, Fair Value | 212,953 | 347,874
Total Gross Unrealized Losses | 56,765 | 79,112
Total Fair Value | 212,953 | 347,874
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 0 | 1
Less Than Twelve Months, Fair Value | 0 | 21
Over Twelve Months, Gross Unrealized Losses | 15,332 | 18,359
Over Twelve Months, Fair Value | 87,940 | 94,548
Total Gross Unrealized Losses | 15,332 | 18,360
Total Fair Value | 87,940 | 94,569
Agency mortgage-backed securities |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 0 | 1
Less Than Twelve Months, Fair Value | 0 | 22
Over Twelve Months, Gross Unrealized Losses | 43,155 | 75,154
Over Twelve Months, Fair Value | 232,132 | 417,151
Total Gross Unrealized Losses | 43,155 | 75,155
Total Fair Value | 232,132 | 417,173
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 0 | 0
Less Than Twelve Months, Fair Value | 0 | 0
Over Twelve Months, Gross Unrealized Losses | 7,048 | 8,052
Over Twelve Months, Fair Value | 37,417 | 39,327
Total Gross Unrealized Losses | 7,048 | 8,052
Total Fair Value | 37,417 | 39,327
Agency commercial mortgage-backed securities |  |
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 | 16,148 | 29,553
Over Twelve Months, Fair Value | 70,566 | 145,326
Total Gross Unrealized Losses | 16,148 | 29,553
Total Fair Value | 70,566 | 145,326
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 0 | 0
Less Than Twelve Months, Fair Value | 0 | 0
Over Twelve Months, Gross Unrealized Losses | 22,001 | 24,368
Over Twelve Months, Fair Value | 104,311 | 105,801
Total Gross Unrealized Losses | 22,001 | 24,368
Total Fair Value | 104,311 | 105,801
Corporate bonds |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 0 | 457
Less Than Twelve Months, Fair Value | 0 | 6,543
Over Twelve Months, Gross Unrealized Losses | 3,403 | 3,753
Over Twelve Months, Fair Value | 34,501 | 31,690
Total Gross Unrealized Losses | 3,403 | 4,210
Total Fair Value | 34,501 | 38,233
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 | 5 | 0
Less Than Twelve Months, Fair Value | 370 | 0
Over Twelve Months, Gross Unrealized Losses | 31 | 60
Over Twelve Months, Fair Value | 838 | 922
Total Gross Unrealized Losses | 36 | 60
Total Fair Value | $ 1,208 | $ 922

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