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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized cost | $ 429,328 | $ 654,008
Held To Maturity Gross Unrealized Gain Accumulated In Investments | 2,212 | 5,572
Held To Maturity Securities Gross Unrealized Loss Accumulated In Investments | 7,422 | 6,479
Held-to-Maturity Market Value | 424,118 | 653,101
Amortized Cost | 2,792,326 | 1,348,227
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 9,409 | 8,328
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 22,480 | 7,147
Investment securities, available for sale | 2,779,255 | 1,349,408
Pledged Financial Instruments, Not Separately Reported, Securities | 1,200,000 | 800,000
U.S. Treasuries |  |
Investment Holdings [Line Items] |  |
Amortized cost | 0 | 0
Held To Maturity Gross Unrealized Gain Accumulated In Investments | 0 | 0
Held To Maturity Securities Gross Unrealized Loss Accumulated In Investments | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Amortized Cost | 99 | 98
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 2 | 1
Investment securities, available for sale | 97 | 97
Securities of U.S. government agencies and corporations |  |
Investment Holdings [Line Items] |  |
Amortized cost | 0 | 11,168
Held To Maturity Gross Unrealized Gain Accumulated In Investments | 0 | 0
Held To Maturity Securities Gross Unrealized Loss Accumulated In Investments | 0 | 76
Held-to-Maturity Market Value | 0 | 11,092
Amortized Cost | 32,095 | 15,695
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 57 | 220
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 233 | 0
Investment securities, available for sale | 31,919 | 15,915
Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 25,565 | 162,093
Held To Maturity Gross Unrealized Gain Accumulated In Investments | 0 | 2,042
Held To Maturity Securities Gross Unrealized Loss Accumulated In Investments | 1,045 | 1,535
Held-to-Maturity Market Value | 24,520 | 162,600
Amortized Cost | 565,071 | 290,793
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 691 | 849
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 7,163 | 2,599
Investment securities, available for sale | 558,599 | 289,043
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 147,780 | 255,027
Held To Maturity Gross Unrealized Gain Accumulated In Investments | 258 | 1,372
Held To Maturity Securities Gross Unrealized Loss Accumulated In Investments | 4,385 | 3,000
Held-to-Maturity Market Value | 143,653 | 253,399
Amortized Cost | 423,797 | 150,356
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 819 | 164
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 3,581 | 1,417
Investment securities, available for sale | 421,035 | 149,103
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 12,540 | 143,545
Held To Maturity Gross Unrealized Gain Accumulated In Investments | 0 | 354
Held To Maturity Securities Gross Unrealized Loss Accumulated In Investments | 633 | 1,602
Held-to-Maturity Market Value | 11,907 | 142,297
Amortized Cost | 928,586 | 306,095
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 4,319 | 1,158
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 6,158 | 1,861
Investment securities, available for sale | 926,747 | 305,392
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Amortized cost | 243,443 | 82,175
Held To Maturity Gross Unrealized Gain Accumulated In Investments | 1,954 | 1,804
Held To Maturity Securities Gross Unrealized Loss Accumulated In Investments | 1,359 | 266
Held-to-Maturity Market Value | 244,038 | 83,713
Amortized Cost | 257,300 | 124,269
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 2,554 | 2,162
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 1,429 | 676
Investment securities, available for sale | 258,425 | 125,755
Asset-backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 0 | 0
Held To Maturity Gross Unrealized Gain Accumulated In Investments | 0 | 0
Held To Maturity Securities Gross Unrealized Loss Accumulated In Investments | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Amortized Cost | 511,430 | 377,655
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 611 | 1,628
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 2,810 | 306
Investment securities, available for sale | 509,231 | 378,977
Other securities |  |
Investment Holdings [Line Items] |  |
Amortized cost | 0 | 0
Held To Maturity Gross Unrealized Gain Accumulated In Investments | 0 | 0
Held To Maturity Securities Gross Unrealized Loss Accumulated In Investments | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Amortized Cost | 73,948 | 83,266
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 358 | 2,147
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 1,104 | 287
Investment securities, available for sale | $ 73,202 | $ 85,126

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