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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 127,347 | $ 142,862
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 5,609 | 1,497
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (1,538)
Held-to-Maturity Market Value | 132,956 | 142,821
Total | 2,815,199 | 2,798,298
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 98,518 | 58,555
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (16,304) | (4,769)
Investment securities available-for-sale | 2,897,413 | 2,852,084
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 | 99 | 99
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 4 | 1
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 0
Investment securities available-for-sale | 103 | 100
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 | 116 | 156
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 2 | 2
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 0
Investment securities available-for-sale | 118 | 158
Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 18,560 | 20,818
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 364 | 122
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (174)
Held-to-Maturity Market Value | 18,924 | 20,766
Total | 413,981 | 421,945
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 17,630 | 9,709
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (88) | (99)
Investment securities available-for-sale | 431,523 | 431,555
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 90,005 | 101,267
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 4,000 | 571
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (1,225)
Held-to-Maturity Market Value | 94,005 | 100,613
Total | 489,962 | 474,174
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 11,016 | 4,988
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (6,421) | (2,644)
Investment securities available-for-sale | 494,557 | 476,518
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 8,123 | 9,763
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 108 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (108)
Held-to-Maturity Market Value | 8,231 | 9,655
Total | 729,540 | 769,076
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 31,197 | 16,753
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (139) | (385)
Investment securities available-for-sale | 760,598 | 785,444
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 10,659 | 11,014
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1,137 | 804
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (31)
Held-to-Maturity Market Value | 11,796 | 11,787
Total | 711,854 | 652,986
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 36,206 | 23,729
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (66) | (462)
Investment securities available-for-sale | 747,994 | 676,253
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 | 380,715 | 400,081
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 2,290 | 1,414
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (6,947) | (1,064)
Investment securities available-for-sale | 376,058 | 400,431
Other securities |  |
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 | 88,932 | 79,781
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 173 | 1,959
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (2,643) | (115)
Investment securities available-for-sale | $ 86,462 | $ 81,625

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