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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 88,057 | $ 98,420
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 133 | 1,963
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (4,200) | (485)
Held-to-Maturity Market Value | 83,990 | 99,898
Total | 4,128,546 | 4,180,589
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 3,398 | 58,386
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (288,364) | (31,129)
Investment securities available-for-sale | 3,843,580 | 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 | 36,723 | 34,961
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 4
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (3,343) | (189)
Investment securities available-for-sale | 33,380 | 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 | 79,684 | 78,998
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 248
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (9,576) | (129)
Investment securities available-for-sale | 70,108 | 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 | 697,784 | 728,050
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 5 | 6,635
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (70,037) | (10,548)
Investment securities available-for-sale | 627,752 | 724,137
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 38,327 | 46,362
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 651
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (2,541) | 0
Held-to-Maturity Market Value | 35,786 | 47,013
Total | 762,091 | 729,948
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 3 | 4,294
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (31,727) | (2,352)
Investment securities available-for-sale | 730,367 | 731,890
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 10,178 | 11,882
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 221
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (460) | 0
Held-to-Maturity Market Value | 9,718 | 12,103
Total | 556,531 | 696,258
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 384 | 7,979
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (40,072) | (6,497)
Investment securities available-for-sale | 516,843 | 697,740
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 8,302 | 8,926
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 133 | 915
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (123) | 0
Held-to-Maturity Market Value | 8,312 | 9,841
Total | 1,070,377 | 1,058,735
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 2,710 | 35,591
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (88,243) | (8,594)
Investment securities available-for-sale | 984,844 | 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 | 798,356 | 720,638
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 128 | 1,521
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (42,052) | (2,578)
Investment securities available-for-sale | 756,432 | 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 | (1,076) | (485)
Held-to-Maturity Market Value | 30,174 | 30,941
Total | 127,000 | 133,001
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 168 | 2,114
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (3,314) | (242)
Investment securities available-for-sale | $ 123,854 | $ 134,873

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