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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 84,021 | $ 98,420
Held To Maturity unrecognized gain | 105 | 1,963
Held To Maturity unrecognized loss | 7,641 | 485
Held-to-Maturity Market Value | 76,485 | 99,898
Investment Securities, Available-for-sale, Amortized Cost, Total | 3,827,418 | 4,180,589
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 834 | 58,386
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (418,604) | (31,129)
Investment Securities, Available-for-sale | 3,409,648 | 4,207,846
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, Available-for-sale, Amortized Cost, Total | 37,312 | 34,961
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (4,616) | (189)
Investment Securities, Available-for-sale | 32,696 | 34,776
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, Available-for-sale, Amortized Cost, Total | 80,382 | 78,998
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 248
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (13,914) | (129)
Investment Securities, Available-for-sale | 66,468 | 79,117
Mortgage-backed securities-residential |  |
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, Available-for-sale, Amortized Cost, Total | 747,478 | 728,050
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 47 | 6,635
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (97,462) | (10,548)
Investment Securities, Available-for-sale | 650,063 | 724,137
Mortgage-backed securities-commercial |  |
Investment Holdings [Line Items] |  |
Total | 35,363 | 46,362
Held To Maturity unrecognized gain | 0 | 651
Held To Maturity unrecognized loss | 4,114 | 0
Held-to-Maturity Market Value | 31,249 | 47,013
Investment Securities, Available-for-sale, Amortized Cost, Total | 676,934 | 729,948
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 | 4,294
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (47,374) | (2,352)
Investment Securities, Available-for-sale | 629,562 | 731,890
Collateralized mortgage obligations |  |
Investment Holdings [Line Items] |  |
Total | 9,280 | 11,882
Held To Maturity unrecognized gain | 0 | 221
Held To Maturity unrecognized loss | 827 | 0
Held-to-Maturity Market Value | 8,453 | 12,103
Investment Securities, Available-for-sale, Amortized Cost, Total | 538,970 | 696,258
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 181 | 7,979
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (61,439) | (6,497)
Investment Securities, Available-for-sale | 477,712 | 697,740
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 8,128 | 8,926
Held To Maturity unrecognized gain | 105 | 915
Held To Maturity unrecognized loss | 201 | 0
Held-to-Maturity Market Value | 8,032 | 9,841
Investment Securities, Available-for-sale, Amortized Cost, Total | 832,066 | 1,058,735
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 565 | 35,591
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (124,168) | (8,594)
Investment Securities, Available-for-sale | 708,463 | 1,085,732
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
Investment Securities, Available-for-sale, Amortized Cost, Total | 772,261 | 720,638
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 39 | 1,521
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (60,975) | (2,578)
Investment Securities, Available-for-sale | 711,325 | 719,581
Other securities |  |
Investment Holdings [Line Items] |  |
Total | 31,250 | 31,250
Held To Maturity unrecognized gain | 0 | 176
Held To Maturity unrecognized loss | 2,499 | 485
Held-to-Maturity Market Value | 28,751 | 30,941
Investment Securities, Available-for-sale, Amortized Cost, Total | 142,015 | 133,001
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 2,114
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (8,656) | (242)
Investment Securities, Available-for-sale | $ 133,359 | $ 134,873

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