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SECURITIES (Schedule of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Securities [Line Items] |  |
Debt Securities, Trading, Amortized Cost | $ 27,203 | $ 27,203
Securities—trading | 28,591 | 28,694
Debt Securities, Available-for-sale, Amortized Cost, Total | 3,040,211 | 3,218,777
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2,408 | 1,463
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 388,759 | 431,209
Debt Securities, Available-for-Sale | 2,653,860 | 2,789,031
Held-to-maturity Securities, Amortized Cost | 1,109,959 | 1,117,967
Held-to-maturity Securities, Gross Unrealized Gains | 359 | 109
Held-to-maturity Securities, Gross Unrealized Losses | 153,256 | 175,896
Securities—held-to-maturity | 957,062 | 942,180
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 364 | (379)
debt securities, held-to-maturity, accrued interest receivable | 4,400 | 4,800
Debt Securities, Available-for-Sale, Accrued Interest Receivable | 11,900 | 12,400
U.S. Government and agency obligations |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 53,689 | 56,344
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 10 | 8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1,111 | 1,244
Debt Securities, Available-for-Sale | 52,588 | 55,108
Held-to-maturity Securities, Amortized Cost | 310 | 312
Held-to-maturity Securities, Gross Unrealized Gains | 1 | 0
Held-to-maturity Securities, Gross Unrealized Losses | 5 | 7
Securities—held-to-maturity | 306 | 305
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0
Municipal bonds |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 205,152 | 301,449
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 482 | 530
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 31,913 | 40,770
Debt Securities, Available-for-Sale | 173,721 | 261,209
Held-to-maturity Securities, Amortized Cost | 501,361 | 503,117
Held-to-maturity Securities, Gross Unrealized Gains | 358 | 109
Held-to-maturity Securities, Gross Unrealized Losses | 59,063 | 70,907
Securities—held-to-maturity | 442,656 | 432,319
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 173 | 183
Corporate bonds |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Trading, Amortized Cost | 27,203 | 27,203
Securities—trading | 28,591 | 28,694
Debt Securities, Available-for-sale, Amortized Cost, Total | 133,269 | 133,334
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 15,865 | 11,481
Debt Securities, Available-for-Sale | 117,404 | 121,853
Held-to-maturity Securities, Amortized Cost | 2,929 | 2,961
Held-to-maturity Securities, Gross Unrealized Gains | 0 | 0
Held-to-maturity Securities, Gross Unrealized Losses | 19 | 16
Securities—held-to-maturity | 2,910 | 2,945
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 191 | 196
Mortgage-backed or related securities |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 2,425,602 | 2,505,172
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,647 | 885
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 335,040 | 366,721
Debt Securities, Available-for-Sale | 2,092,209 | 2,139,336
Held-to-maturity Securities, Amortized Cost | 605,359 | 611,577
Held-to-maturity Securities, Gross Unrealized Gains | 0 | 0
Held-to-maturity Securities, Gross Unrealized Losses | 94,169 | 104,966
Securities—held-to-maturity | 511,190 | 506,611
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0
Asset-backed securities |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 222,499 | 222,478
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 269 | 40
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 4,830 | 10,993
Debt Securities, Available-for-Sale | $ 217,938 | $ 211,525

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