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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 80,321 | $ 84,021
Held To Maturity unrecognized gain | 130 | 105
Held To Maturity unrecognized loss | 8,763 | 7,641
Held-to-Maturity Market Value | 71,688 | 76,485
Investment Securities, Available-for-sale, Amortized Cost | 3,382,604 | 3,827,418
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3,842 | 834
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (365,320) | (418,604)
Investment Securities, Available-for-sale | 3,021,126 | 3,409,648
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 | 34,904 | 37,312
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (3,661) | (4,616)
Investment Securities, Available-for-sale | 31,243 | 32,696
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 | 81,790 | 80,382
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (12,010) | (13,914)
Investment Securities, Available-for-sale | 69,780 | 66,468
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 | 744,546 | 747,478
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2,034 | 47
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (85,532) | (97,462)
Investment Securities, Available-for-sale | 661,048 | 650,063
Mortgage-backed securities-commercial |  |
Investment Holdings [Line Items] |  |
Total | 32,926 | 35,363
Held To Maturity unrecognized gain | 0 | 0
Held To Maturity unrecognized loss | 4,628 | 4,114
Held-to-Maturity Market Value | 28,298 | 31,249
Investment Securities, Available-for-sale, Amortized Cost | 543,134 | 676,934
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7 | 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (35,911) | (47,374)
Investment Securities, Available-for-sale | 507,230 | 629,562
Collateralized mortgage obligations |  |
Investment Holdings [Line Items] |  |
Total | 7,970 | 9,280
Held To Maturity unrecognized gain | 0 | 0
Held To Maturity unrecognized loss | 539 | 827
Held-to-Maturity Market Value | 7,431 | 8,453
Investment Securities, Available-for-sale, Amortized Cost | 478,744 | 538,970
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 181 | 181
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (60,277) | (61,439)
Investment Securities, Available-for-sale | 418,648 | 477,712
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 8,175 | 8,128
Held To Maturity unrecognized gain | 130 | 105
Held To Maturity unrecognized loss | 215 | 201
Held-to-Maturity Market Value | 8,090 | 8,032
Investment Securities, Available-for-sale, Amortized Cost | 765,223 | 832,066
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,614 | 565
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (114,320) | (124,168)
Investment Securities, Available-for-sale | 652,517 | 708,463
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 | 600,055 | 772,261
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6 | 39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (39,813) | (60,975)
Investment Securities, Available-for-sale | 560,248 | 711,325
Other securities |  |
Investment Holdings [Line Items] |  |
Total | 31,250 | 31,250
Held To Maturity unrecognized gain | 0 | 0
Held To Maturity unrecognized loss | 3,381 | 2,499
Held-to-Maturity Market Value | 27,869 | 28,751
Investment Securities, Available-for-sale, Amortized Cost | 134,208 | 142,015
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (13,796) | (8,656)
Investment Securities, Available-for-sale | $ 120,412 | $ 133,359

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