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DEBT SECURITIES - Schedule of Amortized Cost, Unrealized or Unrecognized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt securities available for sale |  |
Amortized Cost | $ 2,076,411 | $ 2,334,630
Gross unrealized gains | 282 | 186
Gross unrealized losses | (246,797) | (247,245)
Fair Value | 1,829,896 | 2,087,571
Debt securities held to maturity |  |
Amortized Cost | 851,261 | 872,628
Gross unrealized gains | 0 | 0
Gross unrealized losses | (153,806) | (142,231)
Fair Value | 697,455 | 730,397
U.S. Treasury securities |  |
Debt securities available for sale |  |
Amortized Cost | 500 | 16,031
Gross unrealized gains | 0 | 0
Gross unrealized losses | (3) | (85)
Fair Value | 497 | 15,946
Obligations of U.S. government corporations and agencies |  |
Debt securities available for sale |  |
Amortized Cost | 3,796 | 5,889
Gross unrealized gains | 1 | 1
Gross unrealized losses | (11) | (58)
Fair Value | 3,786 | 5,832
Obligations of states and political subdivisions |  |
Debt securities available for sale |  |
Amortized Cost | 167,814 | 190,819
Gross unrealized gains | 23 | 52
Gross unrealized losses | (18,264) | (18,026)
Fair Value | 149,573 | 172,845
Asset-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 427,722 | 470,046
Gross unrealized gains | 151 | 0
Gross unrealized losses | (469) | (1,823)
Fair Value | 427,404 | 468,223
Commercial mortgage-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 109,386 | 119,044
Gross unrealized gains | 45 | 0
Gross unrealized losses | (15,741) | (15,535)
Fair Value | 93,690 | 103,509
Debt securities held to maturity |  |
Amortized Cost | 422,091 | 428,526
Gross unrealized gains | 0 | 0
Gross unrealized losses | (77,024) | (71,000)
Fair Value | 345,067 | 357,526
Residential mortgage-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 1,196,802 | 1,306,854
Gross unrealized gains | 14 | 5
Gross unrealized losses | (201,248) | (195,547)
Fair Value | 995,568 | 1,111,312
Debt securities held to maturity |  |
Amortized Cost | 429,170 | 444,102
Gross unrealized gains | 0 | 0
Gross unrealized losses | (76,782) | (71,231)
Fair Value | 352,388 | 372,871
Corporate debt securities |  |
Debt securities available for sale |  |
Amortized Cost | 170,391 | 225,947
Gross unrealized gains | 48 | 128
Gross unrealized losses | (11,061) | (16,171)
Fair Value | $ 159,378 | $ 209,904

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