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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 434,369 | $ 654,008
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 275 | 5,572
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (12,006) | (6,479)
Held-to-Maturity Market Value | 422,638 | 653,101
Total | 2,662,329 | 1,348,227
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 4,770 | 8,328
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (40,373) | (7,147)
Investment securities available-for-sale | 2,626,726 | 1,349,408
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 | 98
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (4) | (1)
Investment securities available-for-sale | 95 | 97
Securities of U.S. government agencies and corporations |  |
Investment Holdings [Line Items] |  |
Total | 0 | 11,168
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | (76)
Held-to-Maturity Market Value | 0 | 11,092
Total | 33,438 | 15,695
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 7 | 220
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (600) | 0
Investment securities available-for-sale | 32,845 | 15,915
Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 26,603 | 162,093
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 2,042
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (1,615) | (1,535)
Held-to-Maturity Market Value | 24,988 | 162,600
Total | 581,657 | 290,793
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 551 | 849
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (14,262) | (2,599)
Investment securities available-for-sale | 567,946 | 289,043
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 150,223 | 255,027
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 1,372
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (6,378) | (3,000)
Held-to-Maturity Market Value | 143,845 | 253,399
Total | 362,874 | 150,356
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 118 | 164
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (5,646) | (1,417)
Investment securities available-for-sale | 357,346 | 149,103
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 13,182 | 143,545
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 354
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (727) | (1,602)
Held-to-Maturity Market Value | 12,455 | 142,297
Total | 864,824 | 306,095
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 940 | 1,158
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (15,436) | (1,861)
Investment securities available-for-sale | 850,328 | 305,392
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 244,361 | 82,175
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 275 | 1,804
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (3,286) | (266)
Held-to-Maturity Market Value | 241,350 | 83,713
Total | 247,206 | 124,269
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,533 | 2,162
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (2,626) | (676)
Investment securities available-for-sale | 246,113 | 125,755
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 | 490,685 | 377,655
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 582 | 1,628
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1,499) | (306)
Investment securities available-for-sale | 489,768 | 378,977
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 | 81,546 | 83,266
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,039 | 2,147
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (300) | (287)
Investment securities available-for-sale | $ 82,285 | $ 85,126

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