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SECURITIES (Schedule of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | $ 2,617,986 | $ 2,729,980
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,073 | 2,074
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 374,120 | 358,271
Debt Securities, Available-for-Sale | 2,244,939 | 2,373,783
Held-to-maturity Securities, Amortized Cost | 1,038,634 | 1,059,387
Held-to-maturity Securities, Gross Unrealized Gains | 81 | 687
Held-to-maturity Securities, Gross Unrealized Losses | 169,296 | 152,228
Securities—held-to-maturity | 869,097 | 907,514
Allowance for Credit Losses | (322) | (332)
debt securities, held-to-maturity, accrued interest receivable | 3,900 | 4,500
Debt Securities, Available-for-Sale, Accrued Interest Receivable | 10,700 | 10,800
U.S. Government and agency obligations |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 9,569 | 34,929
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 676 | 740
Debt Securities, Available-for-Sale | 8,893 | 34,189
Held-to-maturity Securities, Amortized Cost | 306 | 307
Held-to-maturity Securities, Gross Unrealized Gains | 0 | 0
Held-to-maturity Securities, Gross Unrealized Losses | 6 | 5
Securities—held-to-maturity | 300 | 302
Allowance for Credit Losses | 0 | 0
Municipal bonds |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 155,850 | 161,264
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 600 | 832
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 29,441 | 29,191
Debt Securities, Available-for-Sale | 127,009 | 132,905
Held-to-maturity Securities, Amortized Cost | 451,091 | 466,032
Held-to-maturity Securities, Gross Unrealized Gains | 81 | 687
Held-to-maturity Securities, Gross Unrealized Losses | 59,467 | 53,563
Securities—held-to-maturity | 391,553 | 412,999
Allowance for Credit Losses | (152) | 157
Corporate bonds |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 131,311 | 131,291
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 120 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 11,990 | 12,168
Debt Securities, Available-for-Sale | 119,441 | 119,123
Held-to-maturity Securities, Amortized Cost | 2,749 | 2,781
Held-to-maturity Securities, Gross Unrealized Gains | 0 | 0
Held-to-maturity Securities, Gross Unrealized Losses | 19 | 20
Securities—held-to-maturity | 2,560 | 2,586
Allowance for Credit Losses | (170) | 175
Mortgage-backed or related securities |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 2,108,139 | 2,179,947
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 118 | 942
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 331,872 | 314,175
Debt Securities, Available-for-Sale | 1,776,385 | 1,866,714
Held-to-maturity Securities, Amortized Cost | 584,488 | 590,267
Held-to-maturity Securities, Gross Unrealized Gains | 0 | 0
Held-to-maturity Securities, Gross Unrealized Losses | 109,804 | 98,640
Securities—held-to-maturity | 474,684 | 491,627
Allowance for Credit Losses | 0 | 0
Asset-backed securities |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 213,117 | 222,549
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 235 | 300
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 141 | 1,997
Debt Securities, Available-for-Sale | $ 213,211 | $ 220,852

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