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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 142,862 | $ 429,328
Held To Maturity unrecognized gain | 1,497 | 2,212
Held To Maturity unrecognized loss | 1,538 | 7,422
Held-to-Maturity Market Value | 142,821 | 424,118
Total | 2,798,298 | 2,792,326
Available for Sale unrecognized gain | 58,555 | 9,409
Available for Sale unrecognized loss | 4,769 | 22,480
Investment securities | 2,852,084 | 2,779,255
U.S. Treasuries |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Held To Maturity unrecognized gain | 0 | 0
Held To Maturity unrecognized loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 99 | 99
Available for Sale unrecognized gain | 1 | 0
Available for Sale unrecognized loss | 0 | 2
Investment securities | 100 | 97
Securities of U.S. government agencies and corporations |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Held To Maturity unrecognized gain | 0 | 0
Held To Maturity unrecognized loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 156 | 32,095
Available for Sale unrecognized gain | 2 | 57
Available for Sale unrecognized loss | 0 | 233
Investment securities | 158 | 31,919
Mortgage-backed securities-residential |  |
Investment Holdings [Line Items] |  |
Total | 20,818 | 25,565
Held To Maturity unrecognized gain | 122 | 0
Held To Maturity unrecognized loss | 174 | 1,045
Held-to-Maturity Market Value | 20,766 | 24,520
Total | 421,945 | 565,071
Available for Sale unrecognized gain | 9,709 | 691
Available for Sale unrecognized loss | 99 | 7,163
Investment securities | 431,555 | 558,599
Mortgage-backed securities-commercial |  |
Investment Holdings [Line Items] |  |
Total | 101,267 | 147,780
Held To Maturity unrecognized gain | 571 | 258
Held To Maturity unrecognized loss | 1,225 | 4,385
Held-to-Maturity Market Value | 100,613 | 143,653
Total | 474,174 | 423,797
Available for Sale unrecognized gain | 4,988 | 819
Available for Sale unrecognized loss | 2,644 | 3,581
Investment securities | 476,518 | 421,035
Collateralized mortgage obligations |  |
Investment Holdings [Line Items] |  |
Total | 9,763 | 12,540
Held To Maturity unrecognized gain | 0 | 0
Held To Maturity unrecognized loss | 108 | 633
Held-to-Maturity Market Value | 9,655 | 11,907
Total | 769,076 | 928,586
Available for Sale unrecognized gain | 16,753 | 4,319
Available for Sale unrecognized loss | 385 | 6,158
Investment securities | 785,444 | 926,747
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 11,014 | 243,443
Held To Maturity unrecognized gain | 804 | 1,954
Held To Maturity unrecognized loss | 31 | 1,359
Held-to-Maturity Market Value | 11,787 | 244,038
Total | 652,986 | 257,300
Available for Sale unrecognized gain | 23,729 | 2,554
Available for Sale unrecognized loss | 462 | 1,429
Investment securities | 676,253 | 258,425
Asset-backed Securities |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Held To Maturity unrecognized gain | 0 | 0
Held To Maturity unrecognized loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 400,081 | 511,430
Available for Sale unrecognized gain | 1,414 | 611
Available for Sale unrecognized loss | 1,064 | 2,810
Investment securities | 400,431 | 509,231
Other securities |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Held To Maturity unrecognized gain | 0 | 0
Held To Maturity unrecognized loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 79,781 | 73,948
Available for Sale unrecognized gain | 1,959 | 358
Available for Sale unrecognized loss | 115 | 1,104
Investment securities | $ 81,625 | $ 73,202

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