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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 131,687 | $ 142,862
Held To Maturity unrecognized gain | 5,011 | 1,497
Held To Maturity unrecognized loss | 0 | 1,538
Held-to-Maturity Market Value | 136,698 | 142,821
Total | 3,330,029 | 2,798,298
Available for Sale unrecognized gain | 99,942 | 58,555
Available for Sale unrecognized loss | 5,391 | 4,769
Investment securities | 3,424,580 | 2,852,084
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
Investment securities | 103 | 100
Debt Securities, Available-for-sale, Amortized Cost | 99 | 99
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
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
Investment securities | 60 | 158
Debt Securities, Available-for-sale, Amortized Cost | 60 | 156
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Mortgage-backed securities-residential |  |
Investment Holdings [Line Items] |  |
Total | 13,990 | 20,818
Held To Maturity unrecognized gain | 197 | 122
Held To Maturity unrecognized loss | 0 | 174
Held-to-Maturity Market Value | 14,187 | 20,766
Total | 704,482 |
Investment securities | 720,183 | 431,555
Debt Securities, Available-for-sale, Amortized Cost | 704,482 | 421,945
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 15,938 | 9,709
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (237) | (99)
Mortgage-backed securities-commercial |  |
Investment Holdings [Line Items] |  |
Total | 71,737 | 101,267
Held To Maturity unrecognized gain | 3,485 | 571
Held To Maturity unrecognized loss | 0 | 1,225
Held-to-Maturity Market Value | 75,222 | 100,613
Total | 584,125 |
Investment securities | 590,936 | 476,518
Debt Securities, Available-for-sale, Amortized Cost | 584,125 | 474,174
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 10,395 | 4,988
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (3,584) | (2,644)
Collateralized mortgage obligations |  |
Investment Holdings [Line Items] |  |
Total | 5,799 | 9,763
Held To Maturity unrecognized gain | 79 | 0
Held To Maturity unrecognized loss | 0 | 108
Held-to-Maturity Market Value | 5,878 | 9,655
Total | 634,418 |
Investment securities | 655,121 | 785,444
Debt Securities, Available-for-sale, Amortized Cost | 634,418 | 769,076
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 21,148 | 16,753
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (445) | (385)
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 9,911 | 11,014
Held To Maturity unrecognized gain | 1,239 | 804
Held To Maturity unrecognized loss | 0 | 31
Held-to-Maturity Market Value | 11,150 | 11,787
Investment securities | 902,518 | 676,253
Debt Securities, Available-for-sale, Amortized Cost | 856,054 | 652,986
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 46,755 | 23,729
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (291) | (462)
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 | 478,539 |
Investment securities | 481,871 | 400,431
Debt Securities, Available-for-sale, Amortized Cost | 478,539 | 400,081
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,158 | 1,414
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (826) | (1,064)
Other securities |  |
Investment Holdings [Line Items] |  |
Total | 30,250 | 0
Held To Maturity unrecognized gain | 11 | 0
Held To Maturity unrecognized loss | 0 | 0
Held-to-Maturity Market Value | 30,261 | 0
Investment securities | 73,788 | 81,625
Debt Securities, Available-for-sale, Amortized Cost | 72,252 | 79,781
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,544 | 1,959
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ (8) | $ (115)

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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