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DEBT SECURITIES - Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | $ 2,334,630 | $ 2,772,453
Unrealized gross gains | 186 | 144
Unrealized gross losses | (247,245) | (311,204)
Fair Value | 2,087,571 | 2,461,393
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |
Amortized Cost | 872,628 | 918,312
Unrealized gross gains | 0 | 0
Unrealized gross losses | (142,231) | (133,017)
Fair Value | 730,397 | 785,295
U.S. Treasury securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 16,031 | 117,805
Unrealized gross gains | 0 | 0
Unrealized gross losses | (85) | (3,744)
Fair Value | 15,946 | 114,061
Obligations of U.S. government corporations and agencies |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 5,889 | 20,097
Unrealized gross gains | 1 | 3
Unrealized gross losses | (58) | (321)
Fair Value | 5,832 | 19,779
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 190,819 | 283,481
Unrealized gross gains | 52 | 106
Unrealized gross losses | (18,026) | (26,075)
Fair Value | 172,845 | 257,512
Asset-backed securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 470,046 | 489,558
Unrealized gross gains | 0 | 0
Unrealized gross losses | (1,823) | (19,683)
Fair Value | 468,223 | 469,875
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 119,044 | 124,423
Unrealized gross gains | 0 | 0
Unrealized gross losses | (15,535) | (16,029)
Fair Value | 103,509 | 108,394
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |
Amortized Cost | 428,526 | 474,820
Unrealized gross gains | 0 | 0
Unrealized gross losses | (71,000) | (63,738)
Fair Value | 357,526 | 411,082
Residential mortgage-backed securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 1,306,854 | 1,463,971
Unrealized gross gains | 5 | 2
Unrealized gross losses | (195,547) | (220,717)
Fair Value | 1,111,312 | 1,243,256
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |
Amortized Cost | 444,102 | 443,492
Unrealized gross gains | 0 | 0
Unrealized gross losses | (71,231) | (69,279)
Fair Value | 372,871 | 374,213
Corporate debt securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 225,947 | 273,118
Unrealized gross gains | 128 | 33
Unrealized gross losses | (16,171) | (24,635)
Fair Value | $ 209,904 | $ 248,516

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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