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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 136,744 | $ 142,862
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 3,696 | 1,497
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (375) | (1,538)
Held-to-Maturity Market Value | 140,065 | 142,821
Total | 2,857,355 | 2,798,298
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 85,992 | 58,555
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (34,659) | (4,769)
Investment securities available-for-sale | 2,908,688 | 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 | 5 | 1
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 0
Investment securities available-for-sale | 104 | 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 | 19,832 | 20,818
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1,046 | 122
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (174)
Held-to-Maturity Market Value | 20,878 | 20,766
Total | 419,423 | 421,945
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 19,215 | 9,709
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (219) | (99)
Investment securities available-for-sale | 438,419 | 431,555
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 97,073 | 101,267
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1,671 | 571
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (375) | (1,225)
Held-to-Maturity Market Value | 98,369 | 100,613
Total | 506,343 | 474,174
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 7,034 | 4,988
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (9,082) | (2,644)
Investment securities available-for-sale | 504,295 | 476,518
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 9,043 | 9,763
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 149 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (108)
Held-to-Maturity Market Value | 9,192 | 9,655
Total | 745,649 | 769,076
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 28,845 | 16,753
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (2,479) | (385)
Investment securities available-for-sale | 772,015 | 785,444
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 10,796 | 11,014
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 830 | 804
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (31)
Held-to-Maturity Market Value | 11,626 | 11,787
Total | 723,470 | 652,986
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 30,576 | 23,729
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (152) | (462)
Investment securities available-for-sale | 753,894 | 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 | 382,415 | 400,081
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 225 | 1,414
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (18,841) | (1,064)
Investment securities available-for-sale | 363,799 | 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 | 79,840 | 79,781
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 90 | 1,959
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (3,886) | (115)
Investment securities available-for-sale | $ 76,044 | $ 81,625

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