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INVESTMENT SECURITIES - Amortized Cost, Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale Debt Securities:
Amortized cost	$ 1,509,736	$ 975,763
Gross unrealized gains	135	30,084
Gross unrealized losses	(131,097)	(3,325)
Fair value	1,378,774	1,002,522
Residential Mortgage Backed Securities
Available-for-sale Debt Securities:
Amortized cost	207,445	32,905
Gross unrealized gains	0	396
Gross unrealized losses	(10,183)	(338)
Fair value	197,262	32,963
Commercial Mortgage Backed Securities
Available-for-sale Debt Securities:
Amortized cost	65,411	62,094
Gross unrealized gains	0	933
Gross unrealized losses	(9,362)	(235)
Fair value	56,049	62,792
Collateralized Residential Mortgage Obligations
Available-for-sale Debt Securities:
Amortized cost	592,449	186,703
Gross unrealized gains	12	2,012
Gross unrealized losses	(39,422)	(1,321)
Fair value	553,039	187,394
Collateralized Commercial Mortgage Obligations
Available-for-sale Debt Securities:
Amortized cost	77,909	135,102
Gross unrealized gains	0	1,890
Gross unrealized losses	(7,390)	(333)
Fair value	70,519	136,659
Municipal bonds
Available-for-sale Debt Securities:
Amortized cost	469,346	516,693
Gross unrealized gains	41	24,154
Gross unrealized losses	(57,839)	(924)
Fair value	411,548	539,923
Held-to-maturity Securities
Amortized cost	2,441	4,169
Gross unrealized gains	0	136
Gross unrealized losses	(56)	0
Fair value	2,385	4,305
Corporate debt securities
Available-for-sale Debt Securities:
Amortized cost	46,672	18,918
Gross unrealized gains	74	699
Gross unrealized losses	(3,801)	(1)
Fair value	42,945	19,616
U.S. Treasury securities
Available-for-sale Debt Securities:
Amortized cost	23,005	23,348
Gross unrealized gains	0	0
Gross unrealized losses	(3,071)	(173)
Fair value	19,934	$ 23,175
Agency debentures
Available-for-sale Debt Securities:
Amortized cost	27,499
Gross unrealized gains	8
Gross unrealized losses	(29)
Fair value	$ 27,478

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