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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Securities available-for-sale:
Less Than 12 Months	$ 563,546	$ 284,581
12 Months or Longer	278,469	296,109
Total	842,015	580,690
Gross Unrealized Losses
Less Than 12 Months	(34,978)	(3,459)
12 Months or Longer	(15,848)	(3,885)
Total	(50,826)	(7,344)
SBA loan pool securities
Securities available-for-sale:
Less Than 12 Months	0	0
12 Months or Longer	9,474	14,591
Total	9,474	14,591
Gross Unrealized Losses
Less Than 12 Months	0	0
12 Months or Longer	(54)	(88)
Total	(54)	(88)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Securities available-for-sale:
Less Than 12 Months	10,696	67,588
12 Months or Longer	0	0
Total	10,696	67,588
Gross Unrealized Losses
Less Than 12 Months	(1,316)	(1,311)
12 Months or Longer	0	0
Total	(1,316)	(1,311)
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations
Securities available-for-sale:
Less Than 12 Months	110,864	85,290
12 Months or Longer	30,293	17,754
Total	141,157	103,044
Gross Unrealized Losses
Less Than 12 Months	(4,705)	(1,184)
12 Months or Longer	(5,720)	(904)
Total	(10,425)	(2,088)
Non-agency residential mortgage-backed securities
Securities available-for-sale:
Less Than 12 Months	41,514
12 Months or Longer	0
Total	41,514
Gross Unrealized Losses
Less Than 12 Months	(10,562)
12 Months or Longer	0
Total	(10,562)
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)
Collateralized loan obligations
Securities available-for-sale:
Less Than 12 Months	233,975	81,962
12 Months or Longer	238,702	253,002
Total	472,677	334,964
Gross Unrealized Losses
Less Than 12 Months	(10,025)	(38)
12 Months or Longer	(10,074)	(2,273)
Total	(20,099)	(2,311)
Corporate debt securities
Securities available-for-sale:
Less Than 12 Months	166,497	4,993
12 Months or Longer	0	0
Total	166,497	4,993
Gross Unrealized Losses
Less Than 12 Months	(8,370)	(7)
12 Months or Longer	0	0
Total	$ (8,370)	$ (7)

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