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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
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

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).

+ References

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