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INVESTMENT SECURITIES - Schedule of Amortized Cost and Estimated Fair Value of Available-for-Sale and Held-to-Maturity Investment Securities (Details) - USD ($) | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Available-for-Sale Debt Securities |  |  |  |  |  |
Amortized Cost | $ 4,290,823,000 |  | $ 4,504,342,000 |  |  |
Gross Unrealized Gain | 1,400,000 |  | 168,000 |  |  |
Gross Unrealized Loss | 555,104,000 |  | 657,973,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 3,737,119,000 |  | 3,846,537,000 |  |  |
Held-to-Maturity Debt Securities |  |  |  |  |  |
Amortized Cost | 1,026,312,000 |  | 1,058,565,000 |  |  |
Gross Unrealized Gain | 1,795,000 |  | 2,665,000 |  |  |
Gross Unrealized Loss | 69,131,000 |  | 75,291,000 |  |  |
Allowance for Credit Losses | 7,000 |  | 8,000 |  |  |
Fair Value | 958,969,000 |  | 985,931,000 |  |  |
Available for sale securities transfers to held to maturity unrealized losses | 105,400,000 |  | 120,400,000 |  |  |
Collateralized mortgage obligation (CMO) |  |  |  |  |  |
Available-for-Sale Debt Securities |  |  |  |  |  |
Amortized Cost | 537,666,000 |  | 560,952,000 |  |  |
Gross Unrealized Gain | 566,000 |  | 0 |  |  |
Gross Unrealized Loss | 82,749,000 |  | 96,333,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 455,483,000 |  | 464,619,000 |  |  |
Fannie Mae (FNMA) mortgage-backed securities (MBS) |  |  |  |  |  |
Available-for-Sale Debt Securities |  |  |  |  |  |
Amortized Cost | 3,362,926,000 |  | 3,544,762,000 |  |  |
Gross Unrealized Gain | 793,000 |  | 162,000 |  |  |
Gross Unrealized Loss | 423,832,000 |  | 502,574,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 2,939,887,000 |  | 3,042,350,000 |  |  |
Held-to-Maturity Debt Securities |  |  |  |  |  |
Amortized Cost | 841,697,000 |  | 872,653,000 |  |  |
Gross Unrealized Gain | 0 |  | 0 |  |  |
Gross Unrealized Loss | 68,348,000 |  | 74,332,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 773,349,000 |  | 798,321,000 |  |  |
Freddie Mac (FHLMC) MBS |  |  |  |  |  |
Available-for-Sale Debt Securities |  |  |  |  |  |
Amortized Cost | 120,570,000 |  | 126,856,000 |  |  |
Gross Unrealized Gain | 0 |  | 0 |  |  |
Gross Unrealized Loss | 8,763,000 |  | 11,324,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 111,807,000 |  | 115,532,000 |  |  |
Ginnie Mae (GNMA) MBS |  |  |  |  |  |
Available-for-Sale Debt Securities |  |  |  |  |  |
Amortized Cost | 46,150,000 |  | 46,333,000 |  |  |
Gross Unrealized Gain | 41,000 |  | 6,000 |  |  |
Gross Unrealized Loss | 2,368,000 |  | 2,999,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 43,823,000 |  | 43,340,000 |  |  |
Government-sponsored enterprises (GSE) agency notes |  |  |  |  |  |
Available-for-Sale Debt Securities |  |  |  |  |  |
Amortized Cost | 223,511,000 |  | 225,439,000 |  |  |
Gross Unrealized Gain | 0 |  | 0 |  |  |
Gross Unrealized Loss | 37,392,000 |  | 44,743,000 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 186,119,000 |  | 180,696,000 |  |  |
State and political subdivisions |  |  |  |  |  |
Held-to-Maturity Debt Securities |  |  |  |  |  |
Amortized Cost | 184,615,000 |  | 185,912,000 |  |  |
Gross Unrealized Gain | 1,795,000 |  | 2,665,000 |  |  |
Gross Unrealized Loss | 783,000 |  | 959,000 |  |  |
Allowance for Credit Losses | 7,000 | $ 7,000 | 8,000 | $ 8,000 | $ 8,000 | $ 10,000
Fair Value | $ 185,620,000 |  | $ 187,610,000 |  |  |

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