SECURITIES - Available-for-sale Major Categories (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Securities available-for-sale:
Amortized Cost	$ 1,088,549	$ 1,574,094
Gross Unrealized Gains	2	11,403
Gross Unrealized Losses	(125,624)	(21,786)
Fair Value	962,927	1,563,711
Agency Notes
Securities available-for-sale:
Amortized Cost		82,476
Gross Unrealized Losses		(2,222)
Fair Value		80,254
Treasury Securities
Securities available-for-sale:
Amortized Cost	247,157	247,916
Gross Unrealized Losses	(21,232)	(3,147)
Fair Value	225,925	244,769
Corporate Securities
Securities available-for-sale:
Amortized Cost	174,344	148,430
Gross Unrealized Gains		4,354
Gross Unrealized Losses	(17,312)	(754)
Fair Value	157,032	152,030
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs")
Securities available-for-sale:
Amortized Cost	287,157	528,749
Gross Unrealized Gains		4,271
Gross Unrealized Losses	(34,502)	(6,566)
Fair Value	252,655	526,454
Agency collateralized mortgage obligations ("CMOs")
Securities available-for-sale:
Amortized Cost	342,734	527,348
Gross Unrealized Gains	2	2,705
Gross Unrealized Losses	(49,019)	(8,795)
Fair Value	293,717	521,258
State and municipal obligations.
Securities available-for-sale:
Amortized Cost	37,157	39,175
Gross Unrealized Gains		73
Gross Unrealized Losses	(3,559)	(302)
Fair Value	$ 33,598	$ 38,946

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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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Amount, before tax, of unrealized loss 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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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and 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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