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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 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | $ 2,960 | $ 40,176
Less Than Twelve Months, Fair Value | 62,250 | 443,798
Over Twelve Months, Gross Unrealized Losses | 211,623 | 198,391
Over Twelve Months, Fair Value | 1,299,169 | 938,147
Total Gross Unrealized Losses | 214,583 | 238,567
Total Fair Value | 1,361,419 | 1,381,945
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 1,698 | 8,958
Less Than Twelve Months, Fair Value | 84,259 | 187,307
Over Twelve Months, Gross Unrealized Losses | 66,998 | 67,730
Over Twelve Months, Fair Value | 301,064 | 239,115
Total Gross Unrealized Losses | 68,696 | 76,688
Total Fair Value | 385,323 | 426,422
Securities available for sale and held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 4,658 | 49,134
Less Than Twelve Months, Fair Value | 146,509 | 631,105
Over Twelve Months, Gross Unrealized Losses | 278,621 | 266,121
Over Twelve Months, Fair Value | 1,600,233 | 1,177,262
Total Gross Unrealized Losses | 283,279 | 315,255
Total Fair Value | 1,746,742 | 1,808,367
Municipal bonds and obligations |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 356 | 2,406
Less Than Twelve Months, Fair Value | 13,295 | 36,696
Over Twelve Months, Gross Unrealized Losses | 1,625 | 624
Over Twelve Months, Fair Value | 15,813 | 2,763
Total Gross Unrealized Losses | 1,981 | 3,030
Total Fair Value | 29,108 | 39,459
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 633 | 5,476
Less Than Twelve Months, Fair Value | 46,988 | 125,494
Over Twelve Months, Gross Unrealized Losses | 18,627 | 18,228
Over Twelve Months, Fair Value | 78,012 | 38,341
Total Gross Unrealized Losses | 19,260 | 23,704
Total Fair Value | 125,000 | 163,835
Agency collateralized mortgage obligations |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 250 | 23,052
Less Than Twelve Months, Fair Value | 9,999 | 247,509
Over Twelve Months, Gross Unrealized Losses | 86,528 | 76,735
Over Twelve Months, Fair Value | 515,950 | 284,434
Total Gross Unrealized Losses | 86,778 | 99,787
Total Fair Value | 525,949 | 531,943
Securities held to maturity |  |
Less Than Twelve Months, Gross Unrealized Losses | 1,065 | 2,734
Less Than Twelve Months, Fair Value | 37,271 | 49,539
Over Twelve Months, Gross Unrealized Losses | 16,976 | 17,686
Over Twelve Months, Fair Value | 69,023 | 58,177
Total Gross Unrealized Losses | 18,041 | 20,420
Total Fair Value | 106,294 | 107,716
Agency mortgage-backed securities |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 142 | 3,124
Less Than Twelve Months, Fair Value | 4,110 | 37,540
Over Twelve Months, Gross Unrealized Losses | 88,505 | 93,872
Over Twelve Months, Fair Value | 535,398 | 508,683
Total Gross Unrealized Losses | 88,647 | 96,996
Total Fair Value | 539,508 | 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 | 8,511 | 8,940
Over Twelve Months, Fair Value | 41,641 | 39,299
Total Gross Unrealized Losses | 8,511 | 9,240
Total Fair Value | 41,641 | 41,718
Agency commercial mortgage-backed securities |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 911 | 9,885
Less Than Twelve Months, Fair Value | 10,783 | 96,396
Over Twelve Months, Gross Unrealized Losses | 32,848 | 25,865
Over Twelve Months, Fair Value | 216,624 | 132,043
Total Gross Unrealized Losses | 33,759 | 35,750
Total Fair Value | 227,407 | 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 | 22,781 | 22,756
Over Twelve Months, Fair Value | 111,399 | 102,290
Total Gross Unrealized Losses | 22,781 | 23,203
Total Fair Value | 111,399 | 112,003
Corporate bonds |  |
Securities available for sale |  |
Less Than Twelve Months, Gross Unrealized Losses | 1,301 | 1,709
Less Than Twelve Months, Fair Value | 24,063 | 25,657
Over Twelve Months, Gross Unrealized Losses | 2,051 | 1,229
Over Twelve Months, Fair Value | 15,089 | 9,929
Total Gross Unrealized Losses | 3,352 | 2,938
Total Fair Value | 39,152 | 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 | 103 | 120
Over Twelve Months, Fair Value | 989 | 1,008
Total Gross Unrealized Losses | 103 | 121
Total Fair Value | $ 989 | $ 1,150

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