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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Securities available-for-sale:
Less Than 12 Months	$ 418,718	$ 284,581
12 Months or Longer	281,153	296,109
Total	699,871	580,690
Gross Unrealized Losses
Less Than 12 Months	(9,696)	(3,459)
12 Months or Longer	(5,947)	(3,885)
Total	(15,643)	(7,344)
SBA loan pool securities
Securities available-for-sale:
Less Than 12 Months	0	0
12 Months or Longer	13,810	14,591
Total	13,810	14,591
Gross Unrealized Losses
Less Than 12 Months	0	0
12 Months or Longer	(108)	(88)
Total	(108)	(88)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Securities available-for-sale:
Less Than 12 Months	11,733	67,588
12 Months or Longer	0	0
Total	11,733	67,588
Gross Unrealized Losses
Less Than 12 Months	(351)	(1,311)
12 Months or Longer	0	0
Total	(351)	(1,311)
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations
Securities available-for-sale:
Less Than 12 Months	84,047	85,290
12 Months or Longer	15,723	17,754
Total	99,770	103,044
Gross Unrealized Losses
Less Than 12 Months	(2,866)	(1,184)
12 Months or Longer	(2,184)	(904)
Total	(5,050)	(2,088)
Non-agency residential mortgage-backed securities
Securities available-for-sale:
Less Than 12 Months	50,462
12 Months or Longer	0
Total	50,462
Gross Unrealized Losses
Less Than 12 Months	(3,955)
12 Months or Longer	0
Total	(3,955)
Municipal securities
Securities available-for-sale:
Less Than 12 Months		44,748
12 Months or Longer		10,762
Total		55,510
Gross Unrealized Losses
Less Than 12 Months		(919)
12 Months or Longer		(620)
Total		(1,539)
Corporate debt securities
Securities available-for-sale:
Less Than 12 Months	46,123	4,993
12 Months or Longer	0	0
Total	46,123	4,993
Gross Unrealized Losses
Less Than 12 Months	(1,377)	(7)
12 Months or Longer	0	0
Total	(1,377)	(7)
Collateralized loan obligations
Securities available-for-sale:
Less Than 12 Months	226,353	81,962
12 Months or Longer	251,620	253,002
Total	477,973	334,964
Gross Unrealized Losses
Less Than 12 Months	(1,147)	(38)
12 Months or Longer	(3,655)	(2,273)
Total	$ (4,802)	$ (2,311)

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