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SECURITIES (Schedule of Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Schedule of Securities [Line Items] |  |
Debt Securities, Trading, Amortized Cost | $ 27,203 | $ 27,203
Securities—trading | 25,659 | 28,694
Debt Securities, Available-for-sale, Amortized Cost, Total | 2,879,179 | 3,218,777
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 533 | 1,463
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 411,752 | 431,209
Debt Securities, Available-for-sale, Allowance for Credit Loss | (2,000) | 0
Securities—available-for-sale, net of allowance for credit losses of $2,000 and none, respectively; amortized cost $2,879,179 and $3,218,777, respectively | 2,465,960 | 2,789,031
Held-to-maturity Securities, Gross Unrealized Gains | 105 | 109
Held-to-maturity Securities, Gross Unrealized Losses | 165,559 | 175,896
Securities—held-to-maturity | 933,116 | 942,180
Allowance for Credit Losses | (355) | (379)
debt securities, held-to-maturity, accrued interest receivable | 4,700 | 4,800
Debt Securities, Available-for-Sale, Accrued Interest Receivable | 11,100 | 12,400
Debt Securities, Held-to-Maturity, Amortized Cost, Gross |  | 1,117,967
Debt Securities, Held-to-Maturity, Amortized Cost, Net | 1,098,925 |
U.S. Government and agency obligations |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 49,471 | 56,344
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 14 | 8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 1,123 | 1,244
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Securities—available-for-sale, net of allowance for credit losses of $2,000 and none, respectively; amortized cost $2,879,179 and $3,218,777, respectively | 48,362 | 55,108
Held-to-maturity Securities, Gross Unrealized Gains | 0 | 0
Held-to-maturity Securities, Gross Unrealized Losses | 7 | 7
Securities—held-to-maturity | 302 | 305
Allowance for Credit Losses | 0 | 0
Debt Securities, Held-to-Maturity, Amortized Cost, Gross |  | 312
Debt Securities, Held-to-Maturity, Amortized Cost, Net | 309 |
Municipal bonds |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 194,660 | 301,449
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 181 | 530
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 34,073 | 40,770
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Securities—available-for-sale, net of allowance for credit losses of $2,000 and none, respectively; amortized cost $2,879,179 and $3,218,777, respectively | 160,768 | 261,209
Held-to-maturity Securities, Gross Unrealized Gains | 105 | 109
Held-to-maturity Securities, Gross Unrealized Losses | 62,883 | 70,907
Securities—held-to-maturity | 434,598 | 432,319
Allowance for Credit Losses | (170) | 183
Debt Securities, Held-to-Maturity, Amortized Cost, Gross |  | 503,117
Debt Securities, Held-to-Maturity, Amortized Cost, Net | 497,546 |
Corporate bonds |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Trading, Amortized Cost | 27,203 | 27,203
Securities—trading | 25,659 | 28,694
Debt Securities, Available-for-sale, Amortized Cost, Total | 118,160 | 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 | 16,372 | 11,481
Debt Securities, Available-for-sale, Allowance for Credit Loss | (2,000) |
Securities—available-for-sale, net of allowance for credit losses of $2,000 and none, respectively; amortized cost $2,879,179 and $3,218,777, respectively | 99,788 | 121,853
Held-to-maturity Securities, Gross Unrealized Gains | 0 | 0
Held-to-maturity Securities, Gross Unrealized Losses | 24 | 16
Securities—held-to-maturity | 2,635 | 2,945
Allowance for Credit Losses | (185) | 196
Debt Securities, Held-to-Maturity, Amortized Cost, Gross |  | 2,961
Debt Securities, Held-to-Maturity, Amortized Cost, Net | 2,844 |
Mortgage-backed or related securities |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 2,294,371 | 2,505,172
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 275 | 885
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 352,248 | 366,721
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Securities—available-for-sale, net of allowance for credit losses of $2,000 and none, respectively; amortized cost $2,879,179 and $3,218,777, respectively | 1,942,398 | 2,139,336
Held-to-maturity Securities, Gross Unrealized Gains | 0 | 0
Held-to-maturity Securities, Gross Unrealized Losses | 102,645 | 104,966
Securities—held-to-maturity | 495,581 | 506,611
Allowance for Credit Losses | 0 | 0
Debt Securities, Held-to-Maturity, Amortized Cost, Gross |  | 611,577
Debt Securities, Held-to-Maturity, Amortized Cost, Net | 598,226 |
Asset-backed securities |  |
Schedule of Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 222,517 | 222,478
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 63 | 40
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 7,936 | 10,993
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Securities—available-for-sale, net of allowance for credit losses of $2,000 and none, respectively; amortized cost $2,879,179 and $3,218,777, respectively | $ 214,644 | $ 211,525

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