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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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