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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 443,957 | $ 654,008
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 949 | 5,572
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (9,121) | (6,479)
Held-to-Maturity Market Value | 435,785 | 653,101
Total | 2,677,257 | 1,348,227
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 7,500 | 8,328
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (29,848) | (7,147)
Investment securities available-for-sale | 2,654,909 | 1,349,408
U.S. Treasuries |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 98 | 98
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (3) | (1)
Investment securities available-for-sale | 95 | 97
Securities of U.S. government agencies and corporations |  |
Investment Holdings [Line Items] |  |
Total | 0 | 11,168
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | (76)
Held-to-Maturity Market Value | 0 | 11,092
Total | 34,896 | 15,695
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 84 | 220
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (452) | 0
Investment securities available-for-sale | 34,528 | 15,915
Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 31,857 | 162,093
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 2,042
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (1,515) | (1,535)
Held-to-Maturity Market Value | 30,342 | 162,600
Total | 644,358 | 290,793
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,314 | 849
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (10,152) | (2,599)
Investment securities available-for-sale | 635,520 | 289,043
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 152,906 | 255,027
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 13 | 1,372
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (5,503) | (3,000)
Held-to-Maturity Market Value | 147,416 | 253,399
Total | 290,930 | 150,356
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 106 | 164
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (5,059) | (1,417)
Investment securities available-for-sale | 285,977 | 149,103
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 13,982 | 143,545
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 354
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (675) | (1,602)
Held-to-Maturity Market Value | 13,307 | 142,297
Total | 873,923 | 306,095
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 965 | 1,158
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (10,313) | (1,861)
Investment securities available-for-sale | 864,575 | 305,392
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 245,212 | 82,175
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 936 | 1,804
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (1,428) | (266)
Held-to-Maturity Market Value | 244,720 | 83,713
Total | 250,993 | 124,269
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 2,214 | 2,162
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1,910) | (676)
Investment securities available-for-sale | 251,297 | 125,755
Asset-backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 492,702 | 377,655
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 879 | 1,628
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1,354) | (306)
Investment securities available-for-sale | 492,227 | 378,977
Other securities |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 89,357 | 83,266
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,938 | 2,147
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (605) | (287)
Investment securities available-for-sale | $ 90,690 | $ 85,126

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