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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 92,597 | $ 98,420
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 317 | 1,963
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (2,913) | (485)
Held-to-Maturity Market Value | 90,001 | 99,898
Total | 4,113,169 | 4,180,589
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 13,747 | 58,386
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (169,034) | (31,129)
Investment securities available-for-sale | 3,957,882 | 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 | 34,967 | 34,961
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1 | 4
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (2,244) | (189)
Investment securities available-for-sale | 32,724 | 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 | 79,338 | 78,998
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 248
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (5,665) | (129)
Investment securities available-for-sale | 73,673 | 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 | 709,888 | 728,050
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 602 | 6,635
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (43,418) | (10,548)
Investment securities available-for-sale | 667,072 | 724,137
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 42,211 | 46,362
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 651
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (1,403) | 0
Held-to-Maturity Market Value | 40,808 | 47,013
Total | 754,978 | 729,948
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 355 | 4,294
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (17,903) | (2,352)
Investment securities available-for-sale | 737,430 | 731,890
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 10,780 | 11,882
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 221
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (287) | 0
Held-to-Maturity Market Value | 10,493 | 12,103
Total | 621,240 | 696,258
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,277 | 7,979
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (27,662) | (6,497)
Investment securities available-for-sale | 594,855 | 697,740
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 8,356 | 8,926
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 317 | 915
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held-to-Maturity Market Value | 8,673 | 9,841
Total | 1,071,171 | 1,058,735
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 10,441 | 35,591
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (49,260) | (8,594)
Investment securities available-for-sale | 1,032,352 | 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 | 713,587 | 720,638
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 361 | 1,521
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (21,321) | (2,578)
Investment securities available-for-sale | 692,627 | 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 | (1,223) | (485)
Held-to-Maturity Market Value | 30,027 | 30,941
Total | 128,000 | 133,001
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 710 | 2,114
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1,561) | (242)
Investment securities available-for-sale | $ 127,149 | $ 134,873

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