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INVESTMENT SECURITIES - Unrealized Gain/Loss on Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
AFS
Amortized cost	$ 1,100,881	$ 975,763
Gross unrealized gains	3,264	30,084
Gross unrealized losses	(43,961)	(3,325)
Fair value	1,060,184	1,002,522
Residential mortgage-backed securities
AFS
Amortized cost	30,689	32,905
Gross unrealized gains	6	396
Gross unrealized losses	(1,508)	(338)
Fair value	29,187	32,963
Commercial mortgage-backed securities
AFS
Amortized cost	70,312	62,094
Gross unrealized gains	38	933
Gross unrealized losses	(3,958)	(235)
Fair value	66,392	62,792
Residential collateralized mortgage obligations
AFS
Amortized cost	276,246	186,703
Gross unrealized gains	186	2,012
Gross unrealized losses	(9,940)	(1,321)
Fair value	266,492	187,394
Commercial collateralized mortgage obligations
AFS
Amortized cost	138,168	135,102
Gross unrealized gains	135	1,890
Gross unrealized losses	(3,424)	(333)
Fair value	134,879	136,659
Municipal bonds
AFS
Amortized cost	535,353	516,693
Gross unrealized gains	2,802	24,154
Gross unrealized losses	(23,016)	(924)
Fair value	515,139	539,923
HTM
Amortized cost	4,143	4,169
Gross unrealized gains	8	136
Gross unrealized losses	(17)	0
Fair value	4,134	4,305
Corporate debt securities
AFS
Amortized cost	26,850	18,918
Gross unrealized gains	97	699
Gross unrealized losses	(574)	(1)
Fair value	26,373	19,616
U.S. Treasury securities
AFS
Amortized cost	23,263	23,348
Gross unrealized gains	0	0
Gross unrealized losses	(1,541)	(173)
Fair value	$ 21,722	$ 23,175

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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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