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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 154,327 | $ 429,328
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1,007 | 2,212
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (2,295) | (7,422)
Held-to-Maturity Market Value | 153,039 | 424,118
Total | 3,104,152 | 2,792,326
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 54,060 | 9,409
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (5,242) | (22,480)
Investment securities available-for-sale | 3,152,970 | 2,779,255
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 | 1 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | (2)
Investment securities available-for-sale | 100 | 97
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 | 24,709 | 32,095
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 239 | 57
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (139) | (233)
Investment securities available-for-sale | 24,809 | 31,919
Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 23,736 | 25,565
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 163 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (194) | (1,045)
Held-to-Maturity Market Value | 23,705 | 24,520
Total | 507,434 | 565,071
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 7,716 | 691
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1,161) | (7,163)
Investment securities available-for-sale | 513,989 | 558,599
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 107,810 | 147,780
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 248 | 258
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (1,809) | (4,385)
Held-to-Maturity Market Value | 106,249 | 143,653
Total | 482,157 | 423,797
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 5,815 | 819
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1,327) | (3,581)
Investment securities available-for-sale | 486,645 | 421,035
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 11,264 | 12,540
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (181) | (633)
Held-to-Maturity Market Value | 11,083 | 11,907
Total | 940,304 | 928,586
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 18,613 | 4,319
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (531) | (6,158)
Investment securities available-for-sale | 958,386 | 926,747
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 11,517 | 243,443
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 596 | 1,954
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (111) | (1,359)
Held-to-Maturity Market Value | 12,002 | 244,038
Total | 549,546 | 257,300
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 18,991 | 2,554
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (110) | (1,429)
Investment securities available-for-sale | 568,427 | 258,425
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 | 521,357 | 511,430
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,349 | 611
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1,605) | (2,810)
Investment securities available-for-sale | 521,101 | 509,231
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 | 78,546 | 73,948
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,336 | 358
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (369) | (1,104)
Investment securities available-for-sale | $ 79,513 | $ 73,202

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