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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	Sep. 30, 2024	Dec. 31, 2023
Debt securities available for sale
Amortized Cost	$ 2,009,671	$ 2,334,630
Gross unrealized gains	761	186
Gross unrealized losses	(192,315)	(247,245)
Fair Value	1,818,117	2,087,571
Debt securities held to maturity
Amortized Cost	838,883	872,628
Gross unrecognized gains	0	0
Gross unrecognized losses	(126,514)	(142,231)
Fair Value	712,369	730,397
U.S. Treasury securities
Debt securities available for sale
Amortized Cost	250	16,031
Gross unrealized gains	0	0
Gross unrealized losses	0	(85)
Fair Value	250	15,946
Obligations of U.S. government corporations and agencies
Debt securities available for sale
Amortized Cost	1,515	5,889
Gross unrealized gains	0	1
Gross unrealized losses	(7)	(58)
Fair Value	1,508	5,832
Obligations of states and political subdivisions
Debt securities available for sale
Amortized Cost	168,052	190,819
Gross unrealized gains	144	52
Gross unrealized losses	(13,144)	(18,026)
Fair Value	155,052	172,845
Asset-backed securities
Debt securities available for sale
Amortized Cost	405,280	470,046
Gross unrealized gains	92	0
Gross unrealized losses	0	(1,823)
Fair Value	405,372	468,223
Commercial mortgage-backed securities
Debt securities available for sale
Amortized Cost	106,543	119,044
Gross unrealized gains	228	0
Gross unrealized losses	(12,492)	(15,535)
Fair Value	94,279	103,509
Debt securities held to maturity
Amortized Cost	419,685	428,526
Gross unrecognized gains	0	0
Gross unrecognized losses	(64,780)	(71,000)
Fair Value	354,905	357,526
Residential mortgage-backed securities
Debt securities available for sale
Amortized Cost	1,161,213	1,306,854
Gross unrealized gains	179	5
Gross unrealized losses	(159,225)	(195,547)
Fair Value	1,002,167	1,111,312
Debt securities held to maturity
Amortized Cost	419,198	444,102
Gross unrecognized gains	0	0
Gross unrecognized losses	(61,734)	(71,231)
Fair Value	357,464	372,871
Corporate debt securities
Debt securities available for sale
Amortized Cost	166,818	225,947
Gross unrealized gains	118	128
Gross unrealized losses	(7,447)	(16,171)
Fair Value	$ 159,489	$ 209,904

X

- 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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