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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, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | $ 2,039,952 | $ 2,334,630
Unrealized gross gains | 594 | 186
Unrealized gross losses | (230,325) | (247,245)
Fair Value | 1,810,221 | 2,087,571
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |
Amortized Cost | 826,630 | 872,628
Unrealized gross gains | 0 | 0
Unrealized gross losses | (151,577) | (142,231)
Fair Value | 675,053 | 730,397
U.S. Treasury securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost |  | 16,031
Unrealized gross gains |  | 0
Unrealized gross losses |  | (85)
Fair Value |  | 15,946
Obligations of U.S. government corporations and agencies |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 1,408 | 5,889
Unrealized gross gains | 0 | 1
Unrealized gross losses | (8) | (58)
Fair Value | 1,400 | 5,832
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 156,534 | 190,819
Unrealized gross gains | 31 | 52
Unrealized gross losses | (16,736) | (18,026)
Fair Value | 139,829 | 172,845
Asset-backed securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 336,379 | 470,046
Unrealized gross gains | 181 | 0
Unrealized gross losses | (3) | (1,823)
Fair Value | 336,557 | 468,223
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 107,305 | 119,044
Unrealized gross gains | 0 | 0
Unrealized gross losses | (15,131) | (15,535)
Fair Value | 92,174 | 103,509
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |
Amortized Cost | 415,530 | 428,526
Unrealized gross gains | 0 | 0
Unrealized gross losses | (77,242) | (71,000)
Fair Value | 338,288 | 357,526
Residential mortgage-backed securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 1,279,090 | 1,306,854
Unrealized gross gains | 19 | 5
Unrealized gross losses | (191,899) | (195,547)
Fair Value | 1,087,210 | 1,111,312
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |
Amortized Cost | 411,100 | 444,102
Unrealized gross gains | 0 | 0
Unrealized gross losses | (74,335) | (71,231)
Fair Value | 336,765 | 372,871
Corporate debt securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 159,236 | 225,947
Unrealized gross gains | 363 | 128
Unrealized gross losses | (6,548) | (16,171)
Fair Value | $ 153,051 | $ 209,904

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