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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities held-to-maturity:
Amortized cost	$ 328,287	$ 328,641
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(78,002)	(66,181)
Allowance for Credit Losses	0	0
Securities held-to-maturity	250,285	262,460
Securities available-for-sale:
Amortized cost	968,009	909,563
Gross Unrealized Gains	5	32
Gross Unrealized Losses	(51,924)	(41,298)
Allowance for Credit Losses	(1,036)	0
Available-for-sale securities	915,054	868,297
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Securities held-to-maturity:
Amortized cost	152,748	153,033
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(35,680)	(29,807)
Allowance for Credit Losses	0	0
Securities held-to-maturity	117,068	123,226
Securities available-for-sale:
Amortized cost	79,786	40,431
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,942)	(225)
Allowance for Credit Losses	0	0
Available-for-sale securities	76,844	40,206
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations
Securities held-to-maturity:
Amortized cost	61,337	61,404
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(15,688)	(11,946)
Allowance for Credit Losses	0	0
Securities held-to-maturity	45,649	49,458
Securities available-for-sale:
Amortized cost	93,696	99,075
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(7,864)	(5,884)
Allowance for Credit Losses	0	0
Available-for-sale securities	85,832	93,191
Municipal securities
Securities held-to-maturity:
Amortized cost	114,202	114,204
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(26,634)	(24,428)
Allowance for Credit Losses	0	0
Securities held-to-maturity	87,568	89,776
SBA loan pool securities
Securities available-for-sale:
Amortized cost	8,721	11,241
Gross Unrealized Gains	5	0
Gross Unrealized Losses	(27)	(54)
Allowance for Credit Losses	0	0
Available-for-sale securities	8,699	11,187
Non-agency residential mortgage-backed securities
Securities available-for-sale:
Amortized cost	120,062	90,832
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(15,102)	(10,340)
Allowance for Credit Losses	0	0
Available-for-sale securities	104,960	80,492
Collateralized loan obligations
Securities available-for-sale:
Amortized cost	489,940	492,203
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6,136)	(15,600)
Allowance for Credit Losses	0	0
Available-for-sale securities	483,804	476,603
Corporate debt securities
Securities available-for-sale:
Amortized cost	175,804	175,781
Gross Unrealized Gains	0	32
Gross Unrealized Losses	(19,853)	(9,195)
Allowance for Credit Losses	(1,036)	0
Available-for-sale securities	$ 154,915	$ 166,618

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