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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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- 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).

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