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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 148,778 | $ 429,328
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1,994 | 2,212
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (1,048) | (7,422)
Held-to-Maturity Market Value | 149,724 | 424,118
Total | 2,789,151 | 2,792,326
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 65,125 | 9,409
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (3,774) | (22,480)
Investment securities available-for-sale | 2,850,502 | 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 | 156 | 32,095
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 3 | 57
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | (233)
Investment securities available-for-sale | 159 | 31,919
Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 22,367 | 25,565
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 184 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (41) | (1,045)
Held-to-Maturity Market Value | 22,510 | 24,520
Total | 416,446 | 565,071
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 9,679 | 691
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (103) | (7,163)
Investment securities available-for-sale | 426,022 | 558,599
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 104,586 | 147,780
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1,105 | 258
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (828) | (4,385)
Held-to-Maturity Market Value | 104,863 | 143,653
Total | 440,457 | 423,797
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 6,929 | 819
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (2,052) | (3,581)
Investment securities available-for-sale | 445,334 | 421,035
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 10,545 | 12,540
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (118) | (633)
Held-to-Maturity Market Value | 10,427 | 11,907
Total | 799,072 | 928,586
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 20,067 | 4,319
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (208) | (6,158)
Investment securities available-for-sale | 818,931 | 926,747
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 11,280 | 243,443
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 705 | 1,954
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (61) | (1,359)
Held-to-Maturity Market Value | 11,924 | 244,038
Total | 588,634 | 257,300
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 25,140 | 2,554
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (61) | (1,429)
Investment securities available-for-sale | 613,713 | 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 | 465,542 | 511,430
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,652 | 611
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1,107) | (2,810)
Investment securities available-for-sale | 466,087 | 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 | 78,745 | 73,948
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,654 | 358
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (243) | (1,104)
Investment securities available-for-sale | $ 80,156 | $ 73,202

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