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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 81,236 | $ 84,021
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 17 | 105
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (11,408) | (7,641)
Held-to-Maturity Market Value | 69,845 | 76,485
Total | 3,526,096 | 3,827,418
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 472 | 834
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (482,207) | (418,604)
Investment securities available-for-sale | 3,044,361 | 3,409,648
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 | 37,085 | 37,312
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (4,943) | (4,616)
Investment securities available-for-sale | 32,142 | 32,696
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 | 81,434 | 80,382
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (15,309) | (13,914)
Investment securities available-for-sale | 66,125 | 66,468
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 | 705,681 | 747,478
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 47
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (121,198) | (97,462)
Investment securities available-for-sale | 584,483 | 650,063
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 33,399 | 35,363
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (5,958) | (4,114)
Held-to-Maturity Market Value | 27,441 | 31,249
Total | 599,969 | 676,934
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 2
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (50,399) | (47,374)
Investment securities available-for-sale | 549,570 | 629,562
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 8,410 | 9,280
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (1,182) | (827)
Held-to-Maturity Market Value | 7,228 | 8,453
Total | 488,590 | 538,970
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 181
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (75,659) | (61,439)
Investment securities available-for-sale | 412,931 | 477,712
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 8,177 | 8,128
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 17 | 105
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (530) | (201)
Held-to-Maturity Market Value | 7,664 | 8,032
Total | 814,669 | 832,066
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 472 | 565
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (151,398) | (124,168)
Investment securities available-for-sale | 663,743 | 708,463
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 | 661,779 | 772,261
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 39
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (49,679) | (60,975)
Investment securities available-for-sale | 612,100 | 711,325
Other securities |  |
Investment Holdings [Line Items] |  |
Total | 31,250 | 31,250
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (3,738) | (2,499)
Held-to-Maturity Market Value | 27,512 | 28,751
Total | 136,889 | 142,015
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (13,622) | (8,656)
Investment securities available-for-sale | $ 123,267 | $ 133,359

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