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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Total	$ 85,823	$ 98,420
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	39	1,963
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(6,938)	(485)
Held-to-Maturity Market Value	78,924	99,898
Total	3,959,270	4,180,589
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	685	58,386
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(428,602)	(31,129)
Investment securities available-for-sale	3,531,353	4,207,846
U.S. Treasuries
Investment Holdings [Line Items]
Total	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	0	0
Total	39,313	34,961
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	0	4
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(4,911)	(189)
Investment securities available-for-sale	34,402	34,776
Securities of U.S. government agencies and corporations
Investment Holdings [Line Items]
Total	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	0	0
Total	80,032	78,998
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	0	248
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(13,723)	(129)
Investment securities available-for-sale	66,309	79,117
Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Total	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	0	0
Total	688,513	728,050
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	0	6,635
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(102,221)	(10,548)
Investment securities available-for-sale	586,292	724,137
Commercial Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Total	36,714	46,362
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	651
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(3,758)	0
Held-to-Maturity Market Value	32,956	47,013
Total	731,619	729,948
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	0	4,294
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(46,965)	(2,352)
Investment securities available-for-sale	684,654	731,890
Collateralized Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Total	9,692	11,882
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	221
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(792)	0
Held-to-Maturity Market Value	8,900	12,103
Total	550,209	696,258
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	110	7,979
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(60,471)	(6,497)
Investment securities available-for-sale	489,848	697,740
Obligations of state and other political subdivisions
Investment Holdings [Line Items]
Total	8,167	8,926
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	39	915
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(334)	0
Held-to-Maturity Market Value	7,872	9,841
Total	971,655	1,058,735
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	393	35,591
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(138,949)	(8,594)
Investment securities available-for-sale	833,099	1,085,732
Asset-backed Securities [Member]
Investment Holdings [Line Items]
Total	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	0	0
Total	760,915	720,638
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	157	1,521
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(55,299)	(2,578)
Investment securities available-for-sale	705,773	719,581
Other securities
Investment Holdings [Line Items]
Total	31,250	31,250
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	176
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(2,054)	(485)
Held-to-Maturity Market Value	29,196	30,941
Total	137,014	133,001
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	25	2,114
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(6,063)	(242)
Investment securities available-for-sale	$ 130,976	$ 134,873

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