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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 158,305 | $ 429,328
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 512 | 2,212
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (5,742) | (7,422)
Held-to-Maturity Market Value | 153,075 | 424,118
Total | 3,096,085 | 2,792,326
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 30,204 | 9,409
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (12,478) | (22,480)
Investment securities available-for-sale | 3,113,811 | 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 | 0 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1) | (2)
Investment securities available-for-sale | 98 | 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 | 30,880 | 32,095
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 74 | 57
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (355) | (233)
Investment securities available-for-sale | 30,599 | 31,919
Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 24,937 | 25,565
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 72 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (671) | (1,045)
Held-to-Maturity Market Value | 24,338 | 24,520
Total | 557,730 | 565,071
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 4,566 | 691
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (3,449) | (7,163)
Investment securities available-for-sale | 558,847 | 558,599
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 109,826 | 147,780
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 258
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (4,414) | (4,385)
Held-to-Maturity Market Value | 105,412 | 143,653
Total | 464,611 | 423,797
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,821 | 819
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (2,988) | (3,581)
Investment securities available-for-sale | 463,444 | 421,035
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 11,936 | 12,540
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (429) | (633)
Held-to-Maturity Market Value | 11,507 | 11,907
Total | 919,486 | 928,586
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 9,214 | 4,319
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (3,067) | (6,158)
Investment securities available-for-sale | 925,633 | 926,747
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 11,606 | 243,443
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 440 | 1,954
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (228) | (1,359)
Held-to-Maturity Market Value | 11,818 | 244,038
Total | 542,265 | 257,300
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 12,496 | 2,554
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (504) | (1,429)
Investment securities available-for-sale | 554,257 | 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 | 502,018 | 511,430
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,180 | 611
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1,790) | (2,810)
Investment securities available-for-sale | 501,408 | 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 | 78,996 | 73,948
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 853 | 358
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (324) | (1,104)
Investment securities available-for-sale | $ 79,525 | $ 73,202

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