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INVESTMENT SECURITIES - Unrealized Gain/Loss on Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
AFS
Amortized cost	$ 1,255,850	$ 1,366,629
Gross unrealized gains	261	834
Gross unrealized losses	(123,954)	(116,264)
Fair value	1,132,157	1,251,199
Residential mortgage-backed securities
AFS
Amortized cost	184,354	194,141
Gross unrealized gains	121	117
Gross unrealized losses	(10,722)	(10,460)
Fair value	173,753	183,798
Commercial mortgage-backed securities
AFS
Amortized cost	54,932	55,235
Gross unrealized gains	0	0
Gross unrealized losses	(7,511)	(7,479)
Fair value	47,421	47,756
Residential collateralized mortgage obligations
AFS
Amortized cost	390,117	473,269
Gross unrealized gains	37	8
Gross unrealized losses	(35,193)	(33,539)
Fair value	354,961	439,738
Commercial collateralized mortgage obligations
AFS
Amortized cost	62,043	63,456
Gross unrealized gains	0	0
Gross unrealized losses	(5,555)	(6,059)
Fair value	56,488	57,397
Municipal bonds
AFS
Amortized cost	446,338	452,057
Gross unrealized gains	103	670
Gross unrealized losses	(54,654)	(47,853)
Fair value	391,787	404,874
HTM
Amortized cost	2,336	2,371
Gross unrealized gains	0	0
Gross unrealized losses	(45)	(40)
Fair value	2,291	2,331
Corporate debt securities
AFS
Amortized cost	41,151	45,611
Gross unrealized gains	0	34
Gross unrealized losses	(6,375)	(7,098)
Fair value	34,776	38,547
U.S. Treasury securities
AFS
Amortized cost	22,483	22,658
Gross unrealized gains	0	0
Gross unrealized losses	(2,645)	(2,474)
Fair value	19,838	20,184
Agency debentures
AFS
Amortized cost	54,432	60,202
Gross unrealized gains	0	5
Gross unrealized losses	(1,299)	(1,302)
Fair value	$ 53,133	$ 58,905

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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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