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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt securities available for sale |  |
Amortized Cost | $ 2,146,276 | $ 2,334,630
Gross unrealized gains | 108 | 186
Gross unrealized losses | (248,312) | (247,245)
Fair Value | 1,898,072 | 2,087,571
Debt securities held to maturity |  |
Amortized Cost | 862,218 | 872,628
Gross unrealized gains | 0 | 0
Gross unrealized losses | (149,187) | (142,231)
Fair Value | 713,031 | 730,397
U.S. Treasury securities |  |
Debt securities available for sale |  |
Amortized Cost | 749 | 16,031
Gross unrealized gains | 0 | 0
Gross unrealized losses | (7) | (85)
Fair Value | 742 | 15,946
Obligations of U.S. government corporations and agencies |  |
Debt securities available for sale |  |
Amortized Cost | 5,777 | 5,889
Gross unrealized gains | 1 | 1
Gross unrealized losses | (35) | (58)
Fair Value | 5,743 | 5,832
Obligations of states and political subdivisions |  |
Debt securities available for sale |  |
Amortized Cost | 168,997 | 190,819
Gross unrealized gains | 20 | 52
Gross unrealized losses | (18,091) | (18,026)
Fair Value | 150,926 | 172,845
Asset-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 462,082 | 470,046
Gross unrealized gains | 0 | 0
Gross unrealized losses | (384) | (1,823)
Fair Value | 461,698 | 468,223
Commercial mortgage-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 108,006 | 119,044
Gross unrealized gains | 0 | 0
Gross unrealized losses | (15,443) | (15,535)
Fair Value | 92,563 | 103,509
Debt securities held to maturity |  |
Amortized Cost | 424,946 | 428,526
Gross unrealized gains | 0 | 0
Gross unrealized losses | (74,590) | (71,000)
Fair Value | 350,356 | 357,526
Residential mortgage-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 1,223,453 | 1,306,854
Gross unrealized gains | 2 | 5
Gross unrealized losses | (201,722) | (195,547)
Fair Value | 1,021,733 | 1,111,312
Debt securities held to maturity |  |
Amortized Cost | 437,272 | 444,102
Gross unrealized gains | 0 | 0
Gross unrealized losses | (74,597) | (71,231)
Fair Value | 362,675 | 372,871
Corporate debt securities |  |
Debt securities available for sale |  |
Amortized Cost | 177,212 | 225,947
Gross unrealized gains | 85 | 128
Gross unrealized losses | (12,630) | (16,171)
Fair Value | $ 164,667 | $ 209,904

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